2004 Subaru Legacy Fuel and Emissions Systems

Name: Exhaust Gas Recirculation (EGR) Valve Motor Connector
Brand: Carquest Premium
SKU: PTA1869
Price: 64.99 USD

Below you will find various in-demand Subaru Fuel and Emissions Systems, components and accessories for your 2004 Legacy. Advance Auto Parts has popular Legacy parts like Air Flow Sensors, Fuel Injectors, Fuel Pumps and more. You’ll also find aftermarket and OEM Fuel and Emissions Systems for other Legacy model years including 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 and more. Select a category of 2004 Subaru Legacy Fuel and Emissions Systems below and start saving instantly.

Popular 2004 Subaru Legacy Fuel and Emissions Systems Categories

Air- Fuel Ratio Sensors

Fuel Tank Cleaning Kits

Air Flow Meters and Mass Air

Gas Caps

Fuel Pumps

Oxygen Sensors

Vapor Canister Purge Valves

MAP-Barometric Pressures

Vapor Canister Vent Valves

Manifold Air Pressure Sensors

Canister Purge Solenoids

Air Charge Temperature Sensors

Ambient Air Temperature Sensors

Fuel Injector O-Ring Kits

Electric Pump Filter and Strainers

Fuel Injector Seal Kits

Fuel Injector Gaskets

Fuel Tank Filler Necks

Fuel Injector Connectors

Fuel Injector O-rings

EGR Valve Gaskets

Fuel Pump O-Rings

Fuel Cap Tester Adapters

Fuel Injector Cushion Rings

EGR Valve Motor Connectors

Mass Air Sensor Boots

Essential Fuel and Emissions Systems for 2004 Subaru Legacies

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$64.99

CARQUEST premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

Product Features:

Premium quality materials for longer service life
Sealed connections (where applicable) to prevent environmental corrosion and performance issues
Global coverage for import and/or domestic applications
OE specified wire gauge to ensure a reliable electrical connection
Designed to meet or exceed OE specifications in form, fit and function

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$33.99

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$248.99

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$61.99

With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Product Features:

Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.

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$14.99

CARQUEST gradient density fuel pump strainers deliver reliable filtration and are the first line of defense against fuel system contaminants.

Product Features:

Gradient density provides optimum multi-depth layering of filter media specific for each application
Maximum filtering for increased fuel filter, fuel pump and fuel system life
New strainer required to validate new fuel pump warranty.

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$148.99

100 years of OE experience, supplier to the world’s top automakers, OE Heritage and knowledge built into every aftermarket part, comprehensive portfolio for a wide range of vehicles and model years.

Product Features:

Delphi is a global OE manufacturer and all fuel pumps are built to Delphi’s OE standards
Delphi pumps are designed to operate under extreme temperatures with quick engine starts and to avoid low-fuel hesitation, including alcohol fuels and blends
Improved pump performance as a result of Delphi’s innovative design and durability
Restores fast pressure performance and system integrity, translating to better pumping through less energy
Part is validated, tested and matched to the right vehicle application
Lower amperage draws less load on vehicle’s electrical system
Always be sure to check and clean fuel tank to avoid unnecessary returns
Always replace the fuel strainer when doing a fuel pump repair

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$204.99

Carquest premium engine management products provide the right products for a wide range of domestic and import applications. Delivering the highest performance and durability under demanding conditions.

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$45.46

The FAE Intake Air Temperature Sensor is an ideal high quality aftermarket replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:

Premium aftermarket replacement
Provides performance and dependability
Manufactured to meet OE specifications

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$161.99

Delphi’s history is one of OE heritage and quality. Our global technical requirements include design specifications and validation testing based on over 100 years of OE experience. Our material selections, material thickness, and material types are built from OE specifications to exceed aftermarket expectations. We put in place strict manufacturing processes to ensure quality control in every part we make. Delphi’s pioneering spirit delivers innovative solutions designed to support the aftermarket in servicing the vehicles of today, and tomorrow.

Product Features:

No spacers or washers are required and they come with gaskets for an exact fit, saving time and labor
All parts used in the manufacture process are Delphi validated, tested and matched to the vehicle application, and manufactured in a Delphi ISO certified facility
Delphi’s OE line of EGR valves provides accurate exhaust flow and emission control
Available in port, back pressure, and linear configurations to cover many engine applications
Designed and built using high-temperature and corrosion-resistant materials that perform exceptionally under all engine environments
Each valve and seat is precision machined, helping to maintain long-term stability and performance
No audible regulator noise

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$3.99

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

Meets or exceeds all original equipment specifications
Design to ensure a perfect fit
Engineered and manufactured specifically for the repair environment
Unsurpassed quality you can trust
Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes

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$90.99

CARQUEST MAF sensors are 100% new and are produced by a certified OEM supplier that designs and manufactures new mass air flow sensors

Product Features:

CARQUEST MAF use all new high-quality components at the highest quality standards.
Manufactured with new and advanced technology to perform, fit and function at OE specifications.
All new product that is tested with OEM equipment to OEM standards
Outperforms competition when tested in extreme environmental conditions

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$3.29

The ACDelco Professional Fuel Injector Seal Kit contains high quality aftermarket replacement components for one or more of the following vehicle systems: ignition, and/or engine fuel management. This premium aftermarket kit contains components that are manufactured to meet or exceed your expectations for fit, form, and function.

Product Features:

Professional, premium aftermarket replacement
Provides the performance and dependability you expect from ACDelco
Manufactured to meet expectations for fit, form, and function

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$25.99

Manufactured with OEM quality materials and safety standards by an OE Supplier. Manufactured to pass all state and federal emissions requirements. Specifically designed pressure and vacuum relief valves to prevent evaporation of fuel. A leaking fuel cap can allow up to 30 gallons of gasoline to evaporate over the period of a year.

Product Features:

Come pre-assembled for quick and easy installation.
Several fastener options to work with any fuel cap compartment configuration
Fits vehicles orginally equipped with tether
Reduces air pollution with proper sealing and venting
Manufactured from durable, long-life materials

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$263.99

CARQUEST MAP sensors are manufactured with critical OEM components to ensure that your engine runs efficiently to reach the best gas mileage on your vehicle.

Product Features:

CARQUEST MAP sensors connectors are exact OE fit to ensure the proper vacuum is maintained to prevent power loss and to minimize internal contamination.
CARQUEST MAP sensors utilize high temperature resistant seals. Damaged seals can directly impact the vehicles fuel-to-air ratio, making it less fuel efficient.
CARQUEST MAP sensors are 100% individually tested for all product functionalities including proper vacuum seal and electrical output.

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$94.99

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$69.99

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$8.49

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$39.99

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

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$5.60

Fuel Injector O Ring

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$162.91

At last, pump gas with the assurance that you’re helping protect the environment while you save money. Designed to prevent fuel leaks during fill ups and to therefore diminish the associated likelihood of air and roadway pollution, it resists moisture build up. Rust, corrosion, and the deterioration they cause are averted. Keep expensive, potentially hazardous gas where it belongs: in your tank.

Product Features:

Engineered to comply with current emission standards and to pass state inspections
Powder coated and constructed of durable steel for lasting use
Direct replacement for a proper fit every time
Comes with necessary hardware for installation (where applicable)

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$94.99

The fuel injection system is controlled by the engine control module (ECM) and provides a calculated amount of fuel to the combustion chamber for efficient engine operation.

Product Features:

Application matched components ensure fuel injection system meets all emission regulations.
Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.

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$46.95

Return your air intake system to proper functioning with Dorman’s Air Intake Hose. Constructed of high-quality rubber, the hose resists the drying and cracking that commonly cause check engine lights and drivability issues.

Product Features:

Direct replacement for a proper fit every time
Designed to accommodate all necessary PCV and emission fittings
Hose slides on easily for trouble-free installation
Rigorous quality control measures have been undertaken to ensure that this part conforms to product standards

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$15.29

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Engineered and manufactured specifically for the repair environment
Unsurpassed quality you can trust
Validated for fit, form, and function

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$104.99

Bosch is the world’s leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

Product Features:

Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
Direct Fit includes OE Connector for easy installation
Performance meets or exceeds OE specifications
True Direct-fit OE connectors and harness

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$4.29

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

Designed to OE standards for ease of installation
All electrical connectors are 100% tested for proper mechanical and electrical fit, form and function
Offering thousands of high-quality pigtails & sockets for nearly every electrical job

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$190.99

NTK is the world’s largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle’s on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. While conventional switching oxygen sensors only switch rich or lean, wideband oxygen (or Air-Fuel Ratio) sensors produce a linear output signal that allows the ECU determine exactly how rich or lean an engine is running and make continuous and precise adjustments of the air-fuel mixture to stay closest to stoichiometric, providing the best possible combustion and fewest emissions. A ceramics company at our core, NTK uses state-of-the art technology enabling complete control of the ceramics used in our wideband oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:

OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability

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$293.99

DENSO’s MAP sensors offer leading edge sensing technology which helps controls fuel injection more precisely. They are compact lightweight and designed with fewer connections improving performance and reliability. DENSO’s MAP sensors have high detection accuracy which reduces emissions.

Product Features:

OE technology adapted for the aftermarket
Reduces emissions, increased performance
Delivers the highest reliability and detection accuracy

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$2.17

Fuel Inject Cushion Ring

Upgrade your 2004 Subaru Legacy with Top-Quality Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2004 Subaru Legacy, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your Subaru or enhancing its overall performance, Fuel and Emissions Systems are key to keeping your Legacy functioning at its best. At Advance Auto Parts, we offer a wide selection of 86 Fuel and Emissions Systems for the 2004 Subaru Legacy, designed to meet your needs without breaking the bank. From Air Flow Sensor replacements to Fuel Injectors upgrades, we’ve got you covered with parts that fit your vehicle perfectly and ensure long-lasting performance.

Affordable Prices and Wide Selection

Shopping for Fuel and Emissions Systems for any vehicle can be a hassle, especially if you’re on a budget. But with Advance Auto Parts, you can find high-quality Fuel and Emissions Systems for your 2004 Subaru Legacy at great prices. Our Fuel and Emissions Systems inventory for this model ranges from just $2.01 to $879.99, with an average price of $111.81. Our 86 Fuel and Emissions Systems in stock come from 20 trusted brands, so you’re sure to find the right part for your 2004 Subaru Legacy without overspending.

Top Brands and High Customer Satisfaction

Advance Auto Parts takes pride in offering only the best brands in the automotive industry. For your 2004 Subaru Legacy, we stock popular OEM and aftermarket Fuel and Emissions Systems from top names like FELPRO, Bosch, Carquest Premium, and more. FELPRO Fuel and Emissions Systems start at just $3.49 and boast an impressive 5 stars average rating from customers. Bosch and Carquest Premium also bring quality to the table, with Fuel and Emissions Systems available starting at $4.29, and at an average 5 stars rating. With 3,866 customer reviews and counting, our 2004 Subaru Legacy Fuel and Emissions Systems have a strong track record of reliability, ensuring you can trust your purchase.

Explore Related Parts and More

While you’re here, don’t forget to check out other essential categories that go hand in hand with Fuel and Emissions System upgrades. Explore related part types like Batteries and Chargers, Oil and Lubricants and more to make sure your 2004 Subaru Legacy is always ready to roll. We’re committed to providing you with everything you need to keep your Legacy in top shape, all in one place. Start shopping confidently below for your 2004 Subaru Legacy!

Best-Selling Air Flow Sensors for 2004 Subaru Legacies

Enhance the driving experience in your Subaru with 13 quality Air Flow Sensor components, starting at $45.46.

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$169.99

DENSO Air/Fuel Ratio Sensors are manufactured and tested to the strictest OE standards for unparalleled peformance.; Each component is precision-built for exact replacement+ and a first time fit.; DENSO gives you the right part and the right fit+ the first time.

Product Features:

Specifically designed to meet the increasing demands of today’s engines
100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

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$147.99

OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability

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$209.99

Specifically designed to meet the increasing demands of today’s engines
100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

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$45.46

The FAE Intake Air Temperature Sensor is an ideal high quality aftermarket replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:

Premium aftermarket replacement
Provides performance and dependability
Manufactured to meet OE specifications

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$259.99

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$243.14

DENSO a global supplier to automakers manufactures an OE-equivalent direct fit air fuel ratio sensor that maintains the quality and performance of the Original Equipment it replaces. DENSO continues to innovate with the latest development in air fuel ratio sensors. These components, also known as wide-band oxygen sensors, have a broader response range to provide much finer control of air/fuel mixtures over a greater variety of operating conditions.

Product Features:

Tarnish-proof platinum electrodes provides longer life and maintains accuracy
Quick-response planar zirconia element can quickly detect oxygen concentration
Measures A/F ratios from approximately 12:1 to 19:1
Increased performance by mapping a/f ratios throughout rpm range
Reduces emissions by keeping the air-fuel mixture at an optimum ratio

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$329.99

OE technology adapted for the aftermarket
Reduces emissions, increased performance
Delivers the highest reliability and detection accuracy

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$301.50

Tarnish-proof platinum electrodes provides longer life and maintains accuracy
Quick-response planar zirconia element can quickly detect oxygen concentration
Measures A/F ratios from approximately 12:1 to 19:1
Increased performance by mapping a/f ratios throughout rpm range
Reduces emissions by keeping the air-fuel mixture at an optimum ratio

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$265.99

OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability

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$257.28

Walker manufactures an OE-equivalent direct fit air fuel ratio sensor that maintains the quality and performance of the Original Equipment it replaces.

Product Features:

Tarnish-proof platinum electrodes
Base ceramic probe of Zirconium and Yttrium
Patented Platinum Power Grid
Fine particle filter Installation Notes: Vehicles equipped with Air Fuel Ratio Sensors may look very similar to the Oxygen Sensor. Please confirm the correct part before ordering and if the connector does not match, do not install.

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$68.99

Delphi temperature sensors are built with the latest OE technology; Delphi temperature sensors use durable, one-piece design; Delphi temperature sensors are impervious to electrical noise and interference.

Product Features:

Delphi temperature sensors are built with the latest OE technology
Delphi temperature sensors are impervious to electrical noise and interference
Part is validated, tested and matched to the right vehicle application
Delphi temperature sensors feature a one-piece lead-frame design from sensing element tip to connector terminals to help eliminate internal connectors and failure points

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$49.99

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$46.95

Direct replacement for a proper fit every time
Designed to accommodate all necessary PCV and emission fittings
Hose slides on easily for trouble-free installation
Rigorous quality control measures have been undertaken to ensure that this part conforms to product standards

Most Popular 2004 Subaru Legacy Fuel Injectors

Customize your Subaru with 22 Fuel Injectors products like Air Flow Meters and Mass Air, Fuel Injector Gaskets, and Fuel Injectors, all priced under $247.45.

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$7.49

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Engineered for the sealing repair environment
Unsurpassed quality you can trust
Validated for fit, form, and function

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$4.29

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

Designed to OE standards for ease of installation
All electrical connectors are 100% tested for proper mechanical and electrical fit, form and function
Offering thousands of high-quality pigtails & sockets for nearly every electrical job

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$53.99

CARQUEST’S line of remanufactured OEM fuel injectors are remanufactured using a proven 15 step process at a state-of-the-art remanufacturing facility in the U.S.A. Each injector is 100% tested under multiple operating conditions to ensure each injector meets or exceeds OE specifications for flow rate, spray pattern, coil resistance, form, fit and function. Each injector includes new external seals and O-rings.

Product Features:

Each unit is 100% tested to OE specifications
Includes new O-rings and seals made of premium OE quality materials
Includes application specific technical bulletin, where applicable

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$65.99

Each unit is 100% tested to OE specifications
Includes new O-rings and seals made of premium OE quality materials
Includes application specific technical bulletin, where applicable

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$8.99

High-quality products that meet OE appearance and performance to provide professional technicians and DIYers with a cost-effective solution.

Product Features:

Designed to OE standards for ease of installation
High-quality materials withstand extreme conditions
Undergoes extensive testing to ensure reliability
As a global manufacturer of automotive aftermarket products, we maintain complete quality control throughout the manufacturing process

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$23.49

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Engineered for the sealing repair environment
Unsurpassed quality you can trust
Validated for fit, form, and function

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$147.06

All Delphi Air Mass Sensors feature a patented dimpled flow management feature that provides better control of air separation for more consistent air flow across the sensing elements and enabling outstanding performance in application-specific ducting.

Product Features:

Platinum-coated ceramic heated sensing element design is smaller and less fragile than competitive products
Heated sensing elements are very robust to damage from dust impingement
Heated sensing elements offer proven durability with more that 130 million in the field over the past 16 years
Patented temperature compensation algorithm offers robustness to changes in ambient air temperature
Patented dimple design eliminates the need for a flow straightener in most applications
Probe design offers low restriction air measurement driving increased horsepower
Interchangeability is enabled by common mounting footprint

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$98.99

100 years of OE experience, supplier to the world’s top automakers, OE Heritage and knowledge built into every aftermarket part.

Product Features:

Precisely manufactured internal valves, diaphragms and springs means excellent performance under all engine operating conditions
Quiet operation, no audible regulator noise
Robust diaphragm materials means longer life, improved durability and compatibility with a wide range of fuels
Consistent and predictable fuel pressure throughout system range of control provides great drivability

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$156.99

CARDONE Remanufactured Mass Air Flow Sensors (MAFS) precisely track O.E. output curves and maintain specific tolerances to ensure accurate scan tool readings for proper operation. 100% re-soldering of critical components ensures superior electrical connections, eliminates intermittent failures and lengthens product life. With CARDONE Mass Air Flow Sensors (MAFS), you can expect smooth vehicle performance.

Product Features:

100% re-solder of critical components ensures superior electrical connections, no intermittent failures and longer product life.
On-car vehicle validation routines ensure that modules meet all form, fit, durability and performance requirements.
All modules are 100% tested with automated computer test equipment to ensure full functionality and reliability.
Our sensors precisely track O.E. output curves and maintain spec tolerances to ensure accurate feedback to the vehicle┐s engine control management system.
Components are rated to handle demanding temperature variations for optimum reliability in every environment.
As a remanufactured Original Equipment part, this unit guarantees a perfect vehicle fit.
Our remanufacturing process is earth-friendly, as it reduces the energy and raw material needed to make a new part by 80%.

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$247.45

Air Mass Meter

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$181.37

The Original Equipment brand is the same OEM quality and performance of the original equipment it replaces and is supplied in a plain box, with the car manufacturer’s logo on the part. Original Equipment fuel injectors are manufactured to OE requirements that meet federal emissions and fuel economy standards, and provide exact OE fit for ease of installation.

Product Features:

Original Equipment Manufacturer
Premium internal components
OE Calibrated impedance
Fine atomized spray reduces emissions

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$111.99

WVE is a leading source of advanced vehicle electronics components for replacement applications in the automotive aftermarket and original equipment applications. WVE offers high-technology manufacturing along with innovative solutions and improvements to

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$87.99

MASS AIR FLOW SENSOR

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$15.29

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

Meets or exceeds all original equipment specifications
Application specific design to ensure a perfect fit
Engineered and manufactured specifically for the repair environment
Unsurpassed quality you can trust
Validated for fit, form, and function

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$8.79

Choosing Victor Reinz assures getting OE quality parts in gaskets sets that have the coverage, contents, packaging and electronic cataloging to best meet the needs of the aftermarket.

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$6.05

FI Throttle Body Mou

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$5.81

Fuel Injector Seal

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$5.60

Fuel Injector O Ring

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$4.29

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$2.17

Fuel Inject Cushion Ring

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$2.05

Fuel Injector O-Ring

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$2.01

Fuel Injector O-Ring

Top Picks for 2004 Subaru Legacy Fuel Pumps

Upgrade Subaru Legacies with top-quality Fuel Pumps parts, including 11 OEM and aftermarket selections for your 2004 model.

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$55.99

Carquest Premium electric fuel pumps are engineered by Carter Fuel Systems or Agility Auto Parts to meet or exceed Original Equipment (OE) specifications for fit, form and function. Our Carquest Premium fuel pumps are built to be installed in the Original Equipment module or assembly. We have invested in industry-leading quality upgrades, like upgraded turbine impellers and 100% carbon commutators, to deliver greater reliability. Carquest Premium electric fuel pumps are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

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$99.99

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

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$33.99

CARQUEST Premium electric fuel pumps are built to meet or exceed Original Equipment (OE) specifications for fit, form and function. Our CARQUEST Premium fuel pumps are built to be installed in the Original Equipment module or assembly. We have invested in industry-leading quality upgrades, like upgraded turbine impellers and 100% carbon commutators, to deliver greater reliability. CARQUEST Premium electric fuel pumps are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

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$3.99

Fel-Pro gaskets offer 100% vehicle sealing with application-specific materials to give you sealing solutions with the performance and durability professionals trust

Product Features:

Meets or exceeds all original equipment specifications
Design to ensure a perfect fit
Engineered and manufactured specifically for the repair environment
Unsurpassed quality you can trust
Each Fel-Pro gasket, no matter how small, is engineered to exacting standards with proprietary design, engineering and manufacturing processes

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$162.99

The Denso Electric Fuel Pump is built to meet the stringent requirements of carmakers for high output, extended reliability and reduced noise.

Product Features:

OE-Equivalent and direct fit for easy installation.
OE connections and fittings.
The high output turbine delivers fuel with minimal pressure pulsation for quieter operation.
Ultra-high balanced armature to minimize noise and vibration.
High pressure check valve provides superior hot fuel handling characteristics.
The brushes are designed for durability, efficiency, and low-resistance operation.
High quality relief valve to protect the fuel delivery system.

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$879.99

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

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$563.99

CARQUEST fuel pump modules offer OEM or better performance from an Original Equipment Supplier. The latest advancements in fuel delivery technology are built-in to every CARQUEST Fuel Pump to deliver greater reliability.

Product Features:

Every single pump is 100% tested throughout the entire manufacturing process for worry free, out-of-the-box performance
Triple barb hose fitting provides superior, long-lasting seal
Superior return porting for optimum fuel flow
Enhanced pump to flange harness design provides worry-free electrical performance
Ceramic sender card and float arm that utilizes vehicle-specific geometry to ensure accurate fuel gauge readings for each and every application
Gradient density, dual zone filtration designed for better contamination resistance

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$286.02

The Kyosan Electric Fuel Pump meets or exceeds the OE specifications for fit, durability and performance.

Product Features:

OE-Equivalent electric fuel pump.
Direct fit for easy installation.
OE connections and fittings.
Highly efficient turbine design.
Designed for quieter operation.

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$119.99

Carquest Premium electric fuel pumps are built to meet or exceed Original Equipment (OE) specifications for fit, form and function. Our Carquest Premium fuel pumps are built to be installed in the Original Equipment module or assembly. We have invested in industry-leading quality upgrades, like upgraded turbine impellers and 100% carbon commutators, to deliver greater reliability. Carquest Premium electric fuel pumps are engineered with superior quality components to provide the longest life and reliable performance.

Product Features:

Meets or exceeds OE specifications for fit, form and function
100% carbon commutators provide resistance to aggressive fuels and double the life expectancy of the pump
OE upgraded turbine impellers greatly reduce fuel pulsation
All fuel pumps are 100% performance tested

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$34.99

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

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$15.99

Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.

Product Features:

BAR Certified adapters
Adapter check’s a fuel cap’s ability to hold pressure.
Adapters meet EPA standards for recommended fleet coverage.
Check adapter application chart for specific makes and models

In-Demand Gas Caps for 2004 Subaru Legacies

Select from 12 premium Gas Caps parts for your 2004 Subaru Legacy, with prices ranging from $6.99 to $24.99.

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$11.99

None

Product Features:

Protects your fuel from theft and vandalism
Manufactured from durable, long-life materials
Independently tested for emission control
Passes all state and federal emissions tests
Reduces air pollution with proper sealing and venting

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$14.99

Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$15.49

Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$15.79

Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$24.99

Protects your fuel from theft and vandalism
Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$16.79

Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control
“Torque Override” feature aids in the proper installation of the fuel cap. It produces an audible click as the O-ring that seals the cap is properly compressed.

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$23.99

None

Product Features:

Protects your fuel from theft and vandalism
Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$21.79

Protects your fuel from theft and vandalism
Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$22.99

Protects your fuel from theft and vandalism
Passes all state and federal emissions tests
Manufactured from durable, long-life materials
Reduces air pollution with proper sealing and venting
Independently tested for emission control

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$6.99

None

Product Features:

Protects your fuel from theft and vandalism
Manufactured from durable, long-life materials
Independently tested for emission control
Passes all state and federal emissions tests
Reduces air pollution with proper sealing and venting

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$23.99

Experience uncompromising quality and emissions compliance with these tethered fuel caps. Manufactured with top-tier materials and rigorous production and safety standards adhering to Original Equipment Manufacturer guidelines. Designed meticulously to meet both state and federal emissions requirements, it ensures environmental responsibility. With its specifically engineered pressure and vacuum relief valves, fuel evaporation becomes a thing of the past. Bid farewell to the risk of losing up to 30 gallons of precious gasoline over a year due to a leaking fuel cap. Trust in our superior construction to safeguard your fuel and contribute to a greener future.

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$10.99

None

Product Features:

Protects your fuel from theft and vandalism
Manufactured from durable, long-life materials
Independently tested for emission control
Passes all state and federal emissions tests
Reduces air pollution with proper sealing and venting

Most Sold 2004 Subaru Legacy Oxygen Sensors

Explore our best-selling Subaru parts for the 2004 Legacy among 16 OEM and aftermarket options starting from $69.99.

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$104.99

Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
Direct Fit includes OE Connector for easy installation
Performance meets or exceeds OE specifications
True Direct-fit OE connectors and harness

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$98.99

DENSO Oxygen Sensors are manufactured and tested to the strictest OE standards for unparalleled performance. Each component is precision built for exact replacement, and a first time fit. This innovative line features DENSO’s exclusive aluminum oxide trap layer, designed to protect the ceramic element from silicone and lead posining for improved engine performance, greater fuel efficiency, and unparalleled longevity. DENSO gives you the right part and the right fit, the first time.

Product Features:

Specifically designed to meet the increasing demands of today’s engines
100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

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$77.99

Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
Includes Smart Link Connector, no soldering required
No special tools required for installation
Seared protection tube due to 100% functional quality test
Performance meets or exceeds OE specifications

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$69.99

Specifically designed to meet the increasing demands of today’s engines
100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

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$98.99

Specifically designed to meet the increasing demands of today’s engines
100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

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$114.08

The Bosch oxygen sensor utilizes a mix of zirconium and yttrium oxides and other elements to form a tough base that withstands the intense stress to which oxygen sensors are subjected. Each element is incredibly strong for best-in-class performance and maximum service life.

Product Features:

OE-Equivalent.
Direct fit for easy installation.
OE Style connectors and wire lengths.
Base ceramic probe of Zirconium and Yttrium.
Patented Platinum Power Grid.

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$88.99

NTK is the world’s largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle’s on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. Providing constant closed loop feedback to the ECU, oxygen sensors help to control the air-fuel ratio while alerting OBDII systems of possible problems with fuel delivery or catalytic converter efficiency. A ceramics company at our core, NTK uses state-of-the art technology enabling control of the ceramic element used in our oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:

OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability

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$127.29

Denso First Time Fit oxygen sensors are constructed of the highest quality materials available. High-quality stainless steel, porous polytetrafluoroethylene (PTFE), fluorine rubber, aluminum oxide, high-grade platinum and ceramics are used in each DENSO sensor.

Product Features:

SUPERIOR DESIGN – Maximizes engine performance and fuel efficiency while reducing harmful emissions.
DOUBLE-PROTECTION COVER – Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
ALUMINUM-OXIDE TRAP LAYER – Keeps silicone and lead outside the ceramic element through DENSO’s exclusive design, preventing damage to the platinum electrode.
STAINLESS STEEL HOUSING – Resists corrosion and contamination with a rugged, watertight body.

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$111.99

NTK is the world’s largest supplier and manufacturer of OEM oxygen sensors. Oxygen sensors play a critical role as part of the vehicle’s on-board diagnostic system in maintaining optimal engine performance, maximizing fuel efficiency and reducing harmful emissions. Providing constant closed loop feedback to the ECU, oxygen sensors help to control the air-fuel ratio while alerting OBDII systems of possible problems with fuel delivery or catalytic converter efficiency. A ceramics company at our core, NTK uses state-of-the art technology enabling control of the ceramic element used in our oxygen sensors from raw material to finished product. Trust The Sensor Specialist for full-line market support and OE application technology.

Product Features:

OEM QUALITY: NTK is the world’s largest supplier of original equipment oxygen sensors with renowned quality that meets or exceeds OEM specifications
PRODUCT ENGINEERING: Based on OE expertise, but specifically engineered for the aftermarket, NTK Oxygen Sensors offer superior OE fit, form, function
OE TECHNOLOGY: Upgraded to the latest OE technologies, NTK Oxygen Sensors are designed to reduce OE failures, enhance durability and performance
EXTENSIVE TESTING: OE development includes vibration and thermal shock testing. Testing during manufacturing guarantees quality and reliability
EASY INSTALLATION: NTK Oxygen Sensors are equipped with OE specified, water-resistant connectors and harness accessory hardware for easy installation
ADVANCED CERAMIC SENSOR ELEMENT: 3-stage contaminant-resistant plasma jet and deposit trap overcoat protects against element poisoning
NTK ADVANTAGE: Superior dual-coated platinum interface and thinner ceramic element produces fastest light off and response times with best durability

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$144.93

SUPERIOR DESIGN – Maximizes engine performance and fuel efficiency while reducing harmful emissions.
DOUBLE-PROTECTION COVER – Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
ALUMINUM-OXIDE TRAP LAYER – Keeps silicone and lead outside the ceramic element through DENSO’s exclusive design, preventing damage to the platinum electrode.
STAINLESS STEEL HOUSING – Resists corrosion and contamination with a rugged, watertight body.

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$143.89

OE-Equivalent.
Direct fit for easy installation.
OE Style connectors and wire lengths.
Base ceramic probe of Zirconium and Yttrium.
Patented Platinum Power Grid.

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$134.65

Walker Oxygen Sensors are precision made for outstanding performance and manufactured to meet and exceed all original equipment specification and test requirements.

Product Features:

Improved Engine Response and Performance
Lower Emissions
Improved Fuel Economy
Longer Sensor Life
Meets OEM Specifications Installation Notes: Vehicles equipped with Air Fuel Ratio Sensors may look very similar to the Oxygen Sensor. Please confirm the correct part before ordering and if the connector does not match, do not install

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$115.99

Specifically designed to meet the increasing demands of today’s engines
100% checked for high temperature signal output, air tightness, continuity, and heat resistance for optimal efficiency and performance
Coated with aluminum oxide to prevent silicone and lead from contacting the ceramic element and damaging the platinum electrode
Double protection cover helps maintain proper unit temperature for quicker response times, which is critical to your vehicle’s fuel efficiency
Manufactured with a rugged stainless steel housing and porous PTFE filter to resist corrosion and contamination

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$111.46

SUPERIOR DESIGN – Maximizes engine performance and fuel efficiency while reducing harmful emissions.
DOUBLE-PROTECTION COVER – Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
ALUMINUM-OXIDE TRAP LAYER – Keeps silicone and lead outside the ceramic element through DENSO’s exclusive design, preventing damage to the platinum electrode.
STAINLESS STEEL HOUSING – Resists corrosion and contamination with a rugged, watertight body.

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$84.92

Denso Universal First Time Fit oxygen sensors are constructed of the highest quality materials available. High-quality stainless steel, porous polytetrafluoroethylene (PTFE), fluorine rubber, aluminum oxide, high-grade platinum and ceramics are used in each DENSO sensor. Denso First Time Fit oxygen sensors are coated with a special formulation of aluminum oxide to trap impurities outside of the ceramic element. In head-to-head testing against the leading competitors, DENSO oxygen sensors were rated two times more resistant to silicone and lead poisoning.

Product Features:

SUPERIOR DESIGN – Maximizes engine performance and fuel efficiency while reducing harmful emissions.
DOUBLE-PROTECTION COVER – Maintains proper unit temperature for quicker response times and protects the ceramic element against silicone and lead poisoning.
ALUMINUM-OXIDE TRAP LAYER – Keeps silicone and lead outside the ceramic element through DENSO’s exclusive design, preventing damage to the platinum electrode.
STAINLESS STEEL HOUSING – Resists corrosion and contamination with a rugged, watertight body.

from

$78.99

Premium Bosch oxygen sensors are designed to improve fuel economy while reducing harmful emissions
Direct Fit includes OE Connector for easy installation
Performance meets or exceeds OE specifications
True Direct-fit OE connectors and harness

Top-Rated Fuel and Emissions Systems Brands For Your 2004 Subaru Legacy

Shop for the best-rated brands offering Fuel and Emissions Systems and other products for your 2004 Subaru Legacies. Below you’ll find some of our best rated Fuel and Emissions Systems from FELPRO, Bosch, and Carquest Premium, and more. Fuel and Emissions Systems from these brands that fit a 2004 Legacy start at just $3.49 and are rated as high as 5 stars. OEM and aftermarket Fuel and Emissions Systems don’t get more top quality, durable, and affordable than from the brands below.

Popular FELPRO 2004 Subaru Legacy Fuel and Emissions Systems

When it comes to maintaining or upgrading your 2004 Subaru Legacy, using quality Fuel and Emissions Systems is essential to ensure durability and a perfect fit. FELPRO ticks all of those boxes. We offer a wide selection of FELPRO Fuel and Emissions Systems, specifically designed for the 2004 Subaru Legacy. With over 5 FELPRO brand Fuel and Emissions Systems in stock, you’re sure to find what you need. The prices for these top-notch parts start as low as $3.49, with an average price of just $10.75. Plus, with over 109 customer reviews and an average rating of 5 stars, you can trust that our FELPRO Fuel and Emissions Systems will get the job done right. Choose Advance Auto Parts for reliability, quality, and expert-approved parts that keep your vehicle running strong.

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$3.49

This product is not rated

Exhaust Gas Recirculation (EGR) Valve Gasket

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$3.99

This product is not rated

O-RING

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$23.49

This product is not rated

FUEL INJECTOR O-RING SET

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Popular Bosch 2004 Subaru Legacy Fuel and Emissions Systems

Bosch auto parts is one of the highest quality Fuel and Emissions System brands in the market. Any 2004 Subaru Legacy owner should feel confident when installing genuine Bosch parts in their vehicle. To ensure the best fit and performance for your 2004 Legacy, Advance Auto Parts carries a full inventory of 5 Bosch Fuel and Emissions Systems. Plus you will be keeping your Subaru in peak condition while saving money because prices on these Bosch Fuel and Emissions Systems range from $77.99 to $143.89, plus, with more than 88 customer reviews and an impressive 5 stars average rating, you can be confident the Fram Fuel and Emissions Systems below will deliver on both quality and value.

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$114.08

This product is not rated

Bosch Oxygen Sensor

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$143.89

This product is not rated

Oxygen Sensor

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$78.99

This product is not rated

Oxygen Sensor: 4 Wire, 27.36" Long, Heated, Exact Fit

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FAQs for 2004 Subaru Legacy Fuel and Emissions Systems

Which Fuel and Emissions Systems are best-sellers for 2004 Subaru Legacies?

Out of 86 Fuel and Emissions Systems that fit 2004 Subaru Legacies, the following parts are the top sellers:

Fuel Cap: 10837, Round, Direct Fit, Provides Tight Seal, 1 Pack (18481528) – $14.99
Fuel Injector O-Ring Kit (3504360) – $7.49
Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Universal (19370039) – $77.99

What’s the price range for 2004 Subaru Legacy Fuel and Emissions Systems?

Fuel and Emissions System prices for the 2004 Subaru Legacy start at $2.01 and go up to $879.99 for the most premium parts.

What’s the average price of a Fuel and Emissions System for a 2004 Subaru Legacy?

The average price for Fuel and Emissions Systems for the 2004 Subaru Legacy is $111.81. Keep in mind the variety of part types within our Fuel and Emissions System category so you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Fuel and Emissions Systems for other Subaru Legacy model years?

Yes, we currently carry Fuel and Emissions Systems for 34 model years of Subaru Legacies between 1990 and 2024. Fuel and Emissions Systems are bought most frequently for the following model years: 2023, 2022, 2021, 2020, 2019, 2018, 2017, 2016, and 2015.

What are the cheapest Fuel and Emissions Systems for my 2004 Subaru Legacy?

The cheapest 2004 Subaru Legacy Fuel and Emissions Systems we carry in stock are:

Fuel Injector O-Ring (11844929) – $2.01
Fuel Injector O-Ring (11473924) – $2.05
Fuel Inject Cushion Ring (10740434) – $2.17
Exhaust Gas Recirculation (EGR) Valve Gasket (20688239) – $3.49
O-RING (12005668) – $3.99

What are the top-rated Fuel and Emissions Systems that fit the 2004 Subaru Legacy?

Out of 3,866 reviews by customers, our 2004 Subaru Legacy Fuel and Emissions Systems have an average customer rating of . These are some of the highest-rated Fuel and Emissions System types for the 2004 Subaru Legacy and their top-rated products:

Oxygen Sensors
- Oxygen Sensor: 4 Wire, 17.32" Long, Heated, Exact Fit (18730546) – $104.99
- Oxygen Sensor: Downstream, 4 Wire, 21.26" Long, Heated, Exact Fit (20471856) – $98.99
- Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Universal (19370039) – $77.99
Air Flow Sensors
- Oxygen Sensor: 4 Wire, 17.32" Long, Heated, Exact Fit (18730546) – $104.99
- Oxygen Sensor: Downstream, 4 Wire, 21.26" Long, Heated, Exact Fit (20471856) – $98.99
- Oxygen Sensor: 4 Wire, 24.02" Long, Heated, Universal (19370039) – $77.99

What types of Fuel and Emissions Systems do you sell for my 2004 Subaru Legacy?

As of 2/5/25, these are some of the most in-demand types of Fuel and Emissions Systems for a 2004 Subaru Legacy:

Can I get help with 2004 Subaru Legacy Fuel and Emissions System orders?

Contact our customer support team, by chat or phone, through the help desk page, where you can find instant answers about Subaru Fuel and Emissions Systems and more.

What is your return policy for Subaru Legacy Fuel and Emissions Systems?

Advance Auto Parts keeps returns simple. For new Subaru Legacy Fuel and Emissions Systems and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

2004 Subaru Legacy Fuel and Emissions Systems

Carquest Premium – Exhaust Gas Recirculation (EGR) Valve Motor Connector (Part No.PTA1869)

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA1548)

Carquest Premium – Idle Air Control Valve (Part No.AEC1088)

Victor Reinz – Fuel Injector O-Ring Kit (Part No.18-10107-01)

Carquest Premium – Fuel Strainer (Part No.FS213)

Delphi – Electric Fuel Pump: With Hose Clamps, Hose Piece, Isolator, Pall Nut, Seal (Part No.FE0150)

Carquest Premium – Vapor Canister (Part No.CPN1223)

FAE – Intake Air Temperature Sensor (Part No.C6000271665FAE)

Delphi – EGR Valve (Part No.EG10503)

Felpro – O-RING (Part No.71857)

Carquest Premium – Mass Air Flow Sensor (MAF) – 100% NEW (Part No.MQ6398)

ACDelco – Fuel Injector Fuel Feed and Return Pipe O-Ring Kit with 2 O-Rings (Part No.217-3366)

Motorad – Tethered Fuel Cap (Part No.MGC837T)

Carquest Premium – Manifold Absolute Pressure Sensor (MAP) (Part No.ECA2431)

Carquest Premium – Vapor Canister Vent Solenoid (Part No.CPC1123)

Carquest Premium – Vapor Canister Purge Solenoid (Part No.CPA2408)

Carquest Premium – Exhaust Gas Recirculation (EGR) Valve Gasket (Part No.EVA1151)

Carquest Premium – Fuel Cap Tester Adapter (Part No.12422)

Ishino Stone – Fuel Injector O Ring (Part No.C1012251371ISH)

Dorman – Fuel Filler Neck (Part No.E2020698641DOR)

Wells Vehicle Electronics – Fuel Injection Pressure Regulator (Part No.5G1532)

Dorman – Air Mass Meter Intake Boot (Part No.B3132337945DOR)

Felpro – THROTTLE BODY GASKET SET (Part No.61733)

Bosch – Oxygen Sensor: 4 Wire, 17.32" Long, Heated, Exact Fit (Part No.15814)

Carquest – Fuel Injector Connector (Part No.PT2318)

NTK – Wideband Oxygen Sensor: Air-Fuel Ratio 4 Wire, 19.8" Long, Heated, Direct Fit (Part No.24831)

DENSO – Manifold Absolute Pressure Sensor (Part No.198-0005)

Ishino – Fuel Inject Cushion Ring (Part No.C1011144317ISH)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 21.85" Long, Heated, Exact Fit (Part No.234-9122)

NTK – Wideband Oxygen Sensor: Air-Fuel Ratio 4 Wire, 22.8" Long, Heated, Direct Fit (Part No.24696)

DENSO – Wideband Oxygen Sensor: Upstream, 4 Wire, 20.47" Long, Heated, Exact Fit (Part No.234-9015)

FAE – Intake Air Temperature Sensor (Part No.C6000271665FAE)

Carquest Premium – Manifold Absolute Pressure Sensor (Part No.ECA2273)

DENSO – First Time Fit Air Fuel Ratio Sensor (Part No.C5015340566ND)

DENSO – Manifold Absolute Pressure Sensor (Part No.198-0003)

DENSO – First Time Fit Air Fuel Ratio Sensor (Part No.C5015137310ND)

NTK – Wideband Oxygen Sensor: Air-Fuel Ratio 4 Wire, 22" Long, Heated, Direct Fit (Part No.24664)

Walker – Walker Air Fuel Ratio Sensor (Part No.C5015380864WKR)

Delphi – Air Charge Temperature Sensor (Part No.TS10029)

Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA1872)

Dorman – Air Mass Meter Intake Boot (Part No.B3132337945DOR)

Felpro – Fuel Injector O-Ring Kit (Part No.ES 70599)

Carquest – Fuel Injector Connector (Part No.PT2318)

Carquest Premium – Remanufactured Fuel Injector (Part No.A212-3384)

Carquest Premium – Remanufactured Fuel Injector (Part No.A212-2754)

Carquest – Fuel Injector Seal Kit (Part No.274838)

Felpro – FUEL INJECTOR O-RING SET (Part No.ES 73035)

Delphi – Air Mass Sensor (Part No.B3150162726DEL)

Delphi – Fuel Injection Pressure Regulator (Part No.FP10407)

Cardone – Remanufactured Mass Air Flow Sensor (Part No.74-50040)

DENSO – Air Mass Meter (Part No.B3130109675ND)

Original Equipment – Original Equipment Fuel Injector (Part No.C1000251345OEA)

Wells Vehicle Electronics – Fuel Injection Pressure Regulator (Part No.5G1323)

Carquest Premium – MASS AIR FLOW SENSOR (Part No.MQ6452)

Felpro – Fuel Injection Throttle Body Mounting Gasket (Part No.61492)

Victor Reinz – Fuel Injector O-Ring Kit (Part No.18-10027-01)

Mahle – FI Throttle Body Mou (Part No.C7001321988MAH)

Ishino – Fuel Injector Seal (Part No.C1010260656ISH)

Ishino Stone – Fuel Injector O Ring (Part No.C1012251371ISH)

Carquest Premium – Fuel Injector Connector (Part No.PTA1064)

Ishino – Fuel Inject Cushion Ring (Part No.C1011144317ISH)

Ishino Stone – Fuel Injector O-Ring (Part No.C1012251370ISH)

Ishino Stone – Fuel Injector O-Ring (Part No.C1012262676ISH)

Carquest Premium – Fuel Pump (Part No.E295017)

Carquest Premium – Fuel Pump (Part No.E2496080)

Carquest Premium – Fuel Pump Strainer FS2393749 (Part No.FS2393749)

Felpro – O-RING (Part No.71857)

DENSO – First Time Fit Electric Fuel Pump (Part No.E3000334268ND)

Carquest Premium – Fuel Pump Module Assembly: Fuel Pump, Sending Unit and Strainer (Part No.M2496343)

Carquest Premium – Fuel Pump Module Assembly (Part No.M2496344)

Kyosan – Electric Fuel Pump (Part No.E3000159571KYO)

Carquest Premium – Fuel Pump E2287255: Includes Wiring Harness (Part No.E2287255)

Carquest Premium – Fuel Cap Tester Adapter (Part No.12427)

Carquest Premium – Fuel Cap Tester Adapter (Part No.12410)

Carquest Premium – Keyed Alike Locking Fuel Cap (Part No.17591)

Carquest Premium – Fuel Cap: 10837, Round, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10837)

Carquest Premium – Fuel Cap: 10834, Screw On, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10834)

Carquest Premium – Gas Cap: Twist On, Reduces Air Pollution, 1 Pack (Part No.10817)

Carquest Premium – Locking Fuel Cap: 10501, Screw On, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10501)