2003 Audi A6 Fuel and Emissions Systems
Find Your Specific 2003 Audi A6 Fuel and Emissions Systems
Below you will find various in-demand Audi Fuel and Emissions Systems, components and accessories for your 2003 A6. Advance Auto Parts has popular A6 parts like Air Flow Sensors, Fuel Pumps, Oxygen Sensors and more. You’ll also find aftermarket and OEM Fuel and Emissions Systems for other A6 model years including
2010,
2011,
2012,
2013,
2014,
2015,
2016,
2017,
2018 and more. Select a category of 2003 Audi A6 Fuel and Emissions Systems below and start saving instantly.
Popular 2003 Audi A6 Fuel and Emissions Systems Categories
Essential Fuel and Emissions Systems for 2003 Audi A6s
NTK – Switching Oxygen Sensor: 4 Wire, 28.5" Long, Heated, Direct Fit (Part No.25083)
from
$116.99
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:
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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
Delphi – Fuel Tank Cleaning Kit (Part No.FC01)
from
$12.49
When replacing a fuel pump or module, it’s extremely important to clean the tank. Existing dirt, debris, and contamination stuck in the fuel tank can clog the brand-new strainer. Delphi’s Fuel Tank Cleaning Kit (FC01) and Tool (FC02) can help clean your fuel tank in less than five minutes. The FC01 includes a low-suds solution, cloth, and gloves that works together with the FC02 to help clean those hard to reach places without having to remove the fuel tank. Visit our Resource Center for helpful tips and tricks on fuel pumps, technologies, and more: https://www.delphiautoparts.com/usa/en-US/resource-center.
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Product Features:
- Helps avoid premature fuel pump failure
- Lint free towel included
- Low suds formulation
- Removes harmful contaminants from the fuel tank
Carquest Premium – Fuel Cap Tester Adapter (Part No.12426)
from
$43.99
Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.
Product Features:
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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
Rein – Ambient Temp Sensor (Part No.P4025342395RIN)
from
$19.57
Ambient Temp Sensor
Hitachi – Mass Air Flow Sensor (Part No.MAF0036)
from
$161.99
Hitachi’s Air Flow Sensors (MAFs) measure the amount and characteristics of air entering the engine. Hitachi uses precision elements and high-quality components for enhanced durability and accurate air flow measurements. Hitachi MAFs are 100% air flow tested for ideal performance and are calibrated for each application ensuring your vehicle meets the strict emission standards set by the manufacturer. Details such as a contaminant bypass port (when applicable) and protected circuitry providing a durable and reliable product approved by OE manufacturers makes Hitachi’s air flow sensors the premium choice.
Product Features:
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Product Features:
- Meets the OE performance and durability standards for this application
- Welded connections instead of soldered for dependability
- Contaminant bypass port provides reliable operation and increases longevity
- Contaminant bypass port provides reliable operation and increases longevity
- Welded connections instead of soldered for dependability
- Meets the OE performance and durability standards for this application
Hitachi – Fuel Injector (Part No.C10002524363HIT)
from
$234.98
Hitachi fuel injectors are manufactured to OE requirements that meet federal emissions and fuel economy standards, and provide exact OE fit for ease of installation. Hitachi injectors are manufactured using internal components that are compatible with alternative fuels or fuel blends, including ethanol mixtures.
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Product Features:
- Original Equipment Manufacturer
- Premium internal components
- OE Calibrated impedance
- Fine atomized spray reduces emissions
A.P.A. URO – Fuel Tank (Gas) Cap (Part No.E2010237140APA)
from
$34.87
APA/URO Fuel Tank Caps are manufactured to meet OE quality, and performance for reliable operation.
Product Features:
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Product Features:
- Meets OE vehicle standards
- Factory type retaining strap for user convenience
- OE quality seal ensures fuel tank emissions are maintained preventing check engine warnings.
Elring – Fuel Injector O-Ring (Part No.C101262400ELR)
from
$1.09
Fuel Injector O-Ring
ACDelco – Fuel Injector Fuel Feed and Return Pipe O-Ring Kit with 2 O-Rings (Part No.217-3366)
from
$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.
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Product Features:
- Professional, premium aftermarket replacement
- Provides the performance and dependability you expect from ACDelco
- Manufactured to meet expectations for fit, form, and function
Elring – Fuel Injector Seal (Part No.C1010681908ELR)
from
$2.51
Fuel Injector Seal
Kayser – Vacuum Check Valve (Part No.O404032232KAY)
from
$33.78
Vacuum Check Valve
Carquest Premium – Multi Purpose Relay (Part No.RAA1816)
from
$55.99
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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Vemo – Vemo Fuel Pump Relay (Part No.P2037127099VMO)
from
$70.63
The Vemo Fuel Pump Relay is an ideal high quality aftermarket replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.
Product Features:
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Product Features:
- Premium aftermarket replacement
- Provides performance and dependability
- Manufactured to meet OE specifications
Vaico – Air Pump (Part No.B6010322330VCO)
from
$302.00
Air Pump
Pierburg – Secondary Air Inj. S (Part No.B7067771415APG)
from
$189.97
Secondary Air Inj. S
Bosch – Turbine Electric Fuel Pump (Part No.E3000162965BOS)
from
$199.21
Benchmark quality from the worldwide leader in fuel injection technology. Bosch state-of-the-art turbine fuel pumps offer many advantages when compared to older roller-cell and inner-gear pump designs. These pumps offer near silent operation and improved drivability, the core components of this turbine design significantly reduce wear and deliver a longer service life. Bosch Turbine Fuel Pumps are nearly identical in dimension and appearance to the units they replace for a precise fit every time. Plus, application-specific, illustrated step-by-step instructions are included with all Bosch Turbine Fuel Pumps for safe and easy installation. To prevent hot start problems, Bosch includes a non-return valve that maintains system pressure long after the vehicle has been shut off.
Product Features:
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Product Features:
- OE-Equivalent Direct fit for easy installation.
- OE connections and fittings.
- Superior turbine pump design that virtually eliminates fuel pulsation.
- Precision, spin-balanced armature to reduce noise and vibration.
- Premium carbon brushes, utilizing advanced materials.
- Noise suppression coil that eliminates radio frequency interference.
- Illustrated step-by-step instructions are included.
Elring – Fuel Injector Repair (Part No.C1040468293ELR)
from
$41.83
Fuel Injector Repair
Bosch – Fuel Injector Seal (Part No.C101016838BOS)
from
$2.06
Bosch is one of the largest global suppliers of automotive products, developing, manufacturing and supplying precision OE components and systems to vehicle manufacturers and the automotive aftermarket.
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Dorman – Evaporative Emissions Purge Solenoid Valve (Part No.911-800)
from
$52.99
Engineered for a perfect fit and plug-and-play installation, this vapor canister purge valve is a direct replacement for the original equipment purge valve. It is critical to the evaporative emissions system and fulfills government requirements.
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Product Features:
- Direct replacement – this vapor canister purge valve fits and functions like original equipment to ensure proper function of your vehicle’s evaporative emissions system.
- Quality construction – manufactured from premium materials for a long service life.
- Excellent value – original equipment quality at a lower price
- Quality tested – has undergone testing to ensure proper fit and performance
ACDelco – Multi-Purpose Wire Connector with Leads (Part No.PT2164)
from
$16.79
ACDelco Professional Air Charge Temperature Sensor Connector is a high quality aftermarket replacement component for one or more of the following vehicle systems: ignition, starting and charging, body-electrical and lighting, and/or engine fuel management. This premium aftermarket connector is manufactured to meet or exceed your expectations for fit, form, and function.
Product Features:
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Product Features:
- Professional, premium aftermarket replacement
- Provides the performance and dependability you expect from ACDelco
- Manufactured to meet expectations for fit, form, and function
Carquest Premium – Fuel Injector Connector (Part No.PTA1064)
from
$4.29
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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Wells Vehicle Electronics – Fuel Injection Pressure Regulator (Part No.5G1368)
from
$58.99
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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Carquest Premium – Secondary Air Injection Pump Check Valve (Part No.EGA1181)
from
$49.99
The Secondary Air Injection system is an emission control device designed to pump fresh air into the engine exhaust system to reduce harmful emissions and convert the emission into harmless water vapor via a chemical reaction. These systems were used heavily in the pre-catalytic converter emission control period but found some application in vehicles with catalytic converter systems.
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Product Features:
- Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
Vemo – Air Temp. Sensor (Part No.C60002930617VMO)
from
$52.65
Air Temp. Sensor
Carquest Premium – Exhaust Gas Recirculation (EGR) Valve Gasket (Part No.EVA1107)
from
$12.99
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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Victor Reinz – Fuel Injection Throttle Body Mounting Gasket (Part No.71-16572-00)
from
$6.29
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.
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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.
DENSO – First Time Fit Air Fuel Ratio Sensor (Part No.C5015689924ND)
from
$224.02
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:
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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
Bosch – Oxygen Sensor (Part No.C501085507BOS)
from
$134.94
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:
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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.
Upgrade your 2003 Audi A6 with Top-Quality Fuel and Emissions Systems
When it comes to maintaining or upgrading your 2003 Audi A6, nothing is more important than using high-quality OEM or aftermarket parts that you can trust. Whether you’re repairing damage to your Audi or enhancing its overall performance, Fuel and Emissions Systems are key to keeping your A6 functioning at its best. At Advance Auto Parts, we offer a wide selection of 61 Fuel and Emissions Systems for the 2003 Audi A6, designed to meet your needs without breaking the bank.
From
Air Flow Sensor
replacements to
Fuel Pumps
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 2003 Audi A6 at great prices.
Our Fuel and Emissions Systems inventory for this model
ranges from just $1.09 to $597.99, with
an average price of $104.72.
Our 61 Fuel and Emissions Systems in stock come from 25 trusted brands, so you’re sure to find the right part for your 2003 Audi A6 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 2003 Audi A6, we stock popular OEM and aftermarket Fuel and Emissions Systems from top names
like FELPRO Bosch, and more.
FELPRO Fuel and Emissions Systems
start at just $7.49 and boast an impressive 5 stars average rating from customers.
With 271 customer reviews and counting, our 2003 Audi A6 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 2003 Audi A6 is always ready to roll. We’re committed to providing you with everything you need to keep your A6 in top shape, all in one place.
Start shopping confidently below for your 2003 Audi A6!
Best-Selling Air Flow Sensors for 2003 Audi A6s
Enhance the driving experience in your Audi with 8 quality Air Flow Sensor components, starting at $11.99.
ACDelco – Multi-Purpose Wire Connector with Leads (Part No.PT2164)
from
$16.79
ACDelco Professional Air Charge Temperature Sensor Connector is a high quality aftermarket replacement component for one or more of the following vehicle systems: ignition, starting and charging, body-electrical and lighting, and/or engine fuel management. This premium aftermarket connector is manufactured to meet or exceed your expectations for fit, form, and function.
Product Features:
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Product Features:
- Professional, premium aftermarket replacement
- Provides the performance and dependability you expect from ACDelco
- Manufactured to meet expectations for fit, form, and function
Rein – Thermo Switch (Part No.ELT0059)
from
$11.99
Electrical parts control all aspects of vehicles on the road today. Replacing these components when they are starting to fail will ensure your vehicle has maximum performance and fuel economy. This is why Rein Automotive electrical parts are application specific and match the design and function of the OE parts.
Product Features:
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Product Features:
- Tested to ensure maximum performance
- Manufactured to strict engineering standards/specifications in materials and tolerances
- Long life and durability
- Made by the OE manufacturer
DENSO – Wideband Oxygen Sensor: Upstream, 5 Wire, 28.74" Long, Heated, Exact Fit (Part No.234-5028)
from
$234.99
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:
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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
DENSO – First Time Fit Oxygen Sensor (Part No.C5010690491ND)
from
$171.36
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:
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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.
Bosch – Bosch Oxygen Sensor (Part No.C5010389596BOS)
from
$116.76
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:
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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.
Carquest Premium – Air Charge Temperature Sensor (Part No.WTA1883)
from
$63.99
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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Carquest Premium – Ambient Air Temperature Sensor (Part No.WTA2018)
from
$60.99
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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Rein – Ambient Temp Sensor (Part No.P4025342395RIN)
from
$19.57
Ambient Temp Sensor
Most Popular 2003 Audi A6 Fuel Pumps
Customize your Audi with 10 Fuel Pumps products
like Fuel Pumps,
Fuel Pump Relays, and
Fuel Cap Tester Adapters, all
priced under $427.81.
Carquest Premium – Fuel Pump Module Assembly: Fuel Pump, Sending Unit and Strainer (Part No.M2335312)
from
$189.99
Carquest Premium fuel pump modules and assemblies are engineered by Carter Fuel Systems or Agility Auto Parts to meet or exceed Original Equipment (OE) specifications for fit, form and function. We have invested in industry-leading quality improvements like upgraded turbine impellers and 100% carbon commutators to deliver greater reliability. Carquest Premium fuel pump modules are supplied with the pump strainer and gaskets or seals when required for the application. Carquest Premium fuel pump modules are engineered with superior quality components to provide the longest life and reliable performance.
Product Features:
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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
- Includes installation gaskets or seals where applicable
Carquest Premium – Fuel Pump Module Assembly: Fuel Pump, Sending Unit, Wiring Harness and Strainer (Part No.M2270372)
from
$148.99
Carquest Premium fuel pump modules and assemblies are engineered by Carter Fuel Systems or Agility Auto Parts to meet or exceed Original Equipment (OE) specifications for fit, form and function. We have invested in industry-leading quality improvements like upgraded turbine impellers and 100% carbon commutators to deliver greater reliability. Carquest Premium fuel pump modules are supplied with the pump strainer and gaskets or seals when required for the application. Carquest Premium fuel pump modules are engineered with superior quality components to provide the longest life and reliable performance.
Product Features:
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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
- Includes installation gaskets or seals where applicable
Carquest Premium – Multi Purpose Relay (Part No.RAA1816)
from
$55.99
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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Bosch – Turbine Electric Fuel Pump Assembly (Part No.E3001456901BOS)
from
$288.24
Benchmark quality from the worldwide leader in fuel injection technology. Bosch state-of-the-art turbine fuel pumps offer many advantages when compared to older roller-cell and inner-gear pump designs. These pumps offer near silent operation and improved drivability, the core components of this turbine design significantly reduce wear and deliver a longer service life. Bosch Turbine Fuel Pumps are nearly identical in dimension and appearance to the units they replace for a precise fit every time. Plus, application-specific, illustrated step-by-step instructions are included with all Bosch Turbine Fuel Pumps for safe and easy installation. To prevent hot start problems, Bosch includes a non-return valve that maintains system pressure long after the vehicle has been shut off.
Product Features:
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Product Features:
- OE-Equivalent Direct fit for easy installation.
- OE connections and fittings.
- Superior turbine pump design that virtually eliminates fuel pulsation.
- Precision, spin-balanced armature to reduce noise and vibration.
- Premium carbon brushes, utilizing advanced materials.
- Noise suppression coil that eliminates radio frequency interference.
- Illustrated step-by-step instructions are included.
Delphi – Electric Fuel Pump and Strainer Set: 12V, With 2 Male Blade Terminals, External Strainer (Part No.FG0418)
from
$209.99
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:
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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
- When servicing the fuel system, always check the fuel filter for possible replacement
- Always be sure to check and clean fuel tank to avoid unnecessary returns
- Always replace the fuel strainer when doing a fuel pump repair
VDO – Electric Fuel Pump Assembly (Part No.E3001121225VDO)
from
$427.81
The VDO Electric Fuel Pump Assembly meets or exceeds the OE specifications for fit, durability and performance.
Product Features:
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Product Features:
- OE-Equivalent electric fuel pump
- Direct fit for easy installation
- OE connections and fittings
- Highly efficient turbine design
- Designed for quieter operation
Continental – Fuel Pump Module Assembly (Part No.E22-041-094Z)
from
$296.49
Continental fuel modules are a genuine OEM part. They are identical in fit, form, and function and provide the genuine quality of OE components supplied to auto manufacturers worldwide. Professional technicians and DIYers alike want quality products for ease of installation, fit, and performance. Continental fuel modules are designed for long service life and simplified installation. They are built in OE ISO TS certified facilities and manufactured to the highest quality standards. They offer dependable performance and robust design by being a genuine OEM part while still maintaining a competitive price.
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Carquest Premium – Fuel Pump Module SP5028MCQ: Fuel Pump and Sending Unit (Part No.SP5028MCQ)
from
$149.99
Carquest Premium fuel pump modules and assemblies are built to meet or exceed Original Equipment (OE) specifications for fit, form and function. We have invested in industry-leading quality improvements like upgraded turbine impellers and 100% carbon commutators to deliver greater reliability. Carquest Premium fuel pump modules are supplied with the pump strainer and gaskets or seals when required for the application. Carquest Premium fuel pump modules are engineered with superior quality components to provide the longest life and reliable performance.
Product Features:
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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
- Upgraded guide rods and springs that are mounted internally on all possible applications
- Increased rubber footings that are E85 compatible
- Includes installation gaskets or seals where applicable
Carquest Premium – Fuel Cap Tester Adapter (Part No.12427)
from
$34.99
Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.
Product Features:
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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
Carquest Premium – Fuel Cap Tester Adapter (Part No.12410)
from
$15.99
Fuel Cap Tester Adaper for use with Stant fuel cap testers. Color coded for easy identification. Made of durable plastic.
Product Features:
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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
Top Picks for 2003 Audi A6 Oxygen Sensors
Upgrade Audi A6s with top-quality Oxygen Sensors parts, including 9 OEM and aftermarket selections for your 2003 model.
Bosch – Oxygen Sensor: 4 Wire, 68.7" Long, Heated, Exact Fit (Part No.16978)
from
$111.99
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:
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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
Bosch – Oxygen Sensor: 4 Wire, 24.92" Long, Heated, Universal (Part No.15733)
from
$80.99
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:
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Product Features:
- 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
Bosch – Wideband Oxygen Sensor: 5 Wire, 28.74" Long, Heated, Exact Fit (Part No.17353)
from
$131.99
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:
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Product Features:
- Advanced Wideband sensing element for exact air/fuel measurement
- Robust sensor design increases sensor longevity
- Seared protection tube due to 100% functional quality test
- True Direct-fit
- Pre-coated threads with anti-seize compound right out of the box
ACERA – ACERA Oxygen Sensor (Part No.C5010566952ACR)
from
$48.77
ACERA’s patented Oxygen / Lambda sensor technology is crafted with the highest precision an designed to endure the toughest environment in the vehicles exhaust system. ACERA has over 20 years of experience in research, and developing, Oxygen Sensors and is one of the few manufacturers in the world that actually integrates the Zirconium Oxide ceramic technology directly into the sensor’s core. Starting with the research and development to formulate the YSZ powder, ACERA then integrates the patented Zirconium Oxide (ZrO2) ceramic center core producing a highly durable, long lasting oxygen sensor that provides a much quicker time to operational temperature with minimal variation. To ensure the highest quality and stability, every new oxygen sensor undergoes a pressurized sealing test as well as a multifunction simulated exhaust bench test.
Product Features:
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Product Features:
- Premium OE Connector
- Premium stainless steel body protecting against extreme heat and corrosion
- Double layer protection for added durability and long life
- Monolithic ceramic element allowing faster operating temperature
- Aluma element surface minimizing thermal variation
- Aluma protection layer that protects the sensor catalyst from harmful gas
- Isolated circuitry that reduces signal noise
- Patented Zirconium Oxide (ZrO2) material
- 100% inspection and testing of product functions on every sensor
Bosch – Universal Oxygen Sensor (Part No.C5010126014BOS)
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$84.18
The Bosch universal 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. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.
Product Features:
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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.
DENSO – First Time Fit Air Fuel Ratio Sensor (Part No.C5015689987ND)
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$203.41
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:
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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
Bosch – Oxygen Sensor (Part No.C5010417731BOS)
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$180.49
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:
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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.
DENSO – Oxygen Sensor: 4 Wire, 69.21" Long, Heated, Exact Fit (Part No.234-4874)
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$135.99
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:
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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
NTK – Switching Oxygen Sensor: 4 Wire, 37" Long, Heated, Direct Fit (Part No.25605)
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$112.99
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:
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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
In-Demand Fuel Injectors for 2003 Audi A6s
Select from 18 premium Fuel Injectors parts for your 2003 Audi A6, with prices ranging from $1.09 to $338.71.
Hitachi – Mass Air Flow Sensor (Part No.MAF0036)
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$161.99
Hitachi’s Air Flow Sensors (MAFs) measure the amount and characteristics of air entering the engine. Hitachi uses precision elements and high-quality components for enhanced durability and accurate air flow measurements. Hitachi MAFs are 100% air flow tested for ideal performance and are calibrated for each application ensuring your vehicle meets the strict emission standards set by the manufacturer. Details such as a contaminant bypass port (when applicable) and protected circuitry providing a durable and reliable product approved by OE manufacturers makes Hitachi’s air flow sensors the premium choice.
Product Features:
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Product Features:
- Meets the OE performance and durability standards for this application
- Welded connections instead of soldered for dependability
- Contaminant bypass port provides reliable operation and increases longevity
- Contaminant bypass port provides reliable operation and increases longevity
- Welded connections instead of soldered for dependability
- Meets the OE performance and durability standards for this application
Felpro – Fuel Injector O-Ring Kit (Part No.ES 70599)
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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:
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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
Carquest – Fuel Injector Seal Kit (Part No.274838)
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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:
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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
Carquest Premium – Mass Air Flow Sensor (MAF) – 100% NEW (Part No.MQ7281)
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$91.99
Advance Auto Parts is proud to carry all new mass air flow sensors that use high-quality components with the highest quality standards.
Product Features:
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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
Felpro – Fuel Injection Throttle Body Mounting Gasket (Part No.61491)
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$7.79
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:
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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
Bosch – Bosch Fuel Pressure Regulator (Part No.C300056477BOS)
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$61.92
An essential part of the Fuel System, the Fuel Pressure Regulators’ sole purpose is to maintain fuel pressure at a constant differential to manifold vacuum under all engine load conditions.
Product Features:
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Product Features:
- Corrosion resistant housing material
- Premium diaphragm materials for longer service life
- Internal precision components maintain stable fuel pressure and ensure adequate fuel return
- Meets or exceeds OEM specifications
Hitachi – Mass Air Meter (Part No.B3130127419HIT)
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$338.71
Hitachi manufactures a direct fit Air Mass Meter that guarantees OEM quality, fit and performance.
Product Features:
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Product Features:
- OEM Quality Direct fit Application
- Platinum coated sensing element
- Meets or exceeds OEM specifications
- Utilizes the factory style mounts, connectors and fittings
- Provides exceptional reliability
Delphi – Mass Air Flow Sensor (Part No.AF10149)
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$223.99
100% new; Delphi OE Technology Validated to match the vehicle applications; Manufactured to meet or exceed OE requirements.
Product Features:
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Product Features:
- Delphi mass air flow sensors are the global benchmark for accuracy and signal noise
- Delphi mass air flow sensors feature high quality sensing elements for outstanding performance over a wide range of ambient temperatures
- Delphi is a manufacturer of OE mass air flow sensors since their first use over 30 years ago
- All parts are calibrated and tested to match the OE part
- Probe solution offered wherever possible to reduce repair time by eliminating the need to replace the flow tube.
- Delphi OE technology validated to match the vehicle applications
Delphi – Fuel Injection Pressure Regulator (Part No.FP10312)
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$172.99
100 years of OE experience, supplier to the world’s top automakers, OE Heritage and knowledge built into every aftermarket part.
Product Features:
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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
Original Equipment – Air Mass Meter Boot (Part No.B3132169940OEA)
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$117.69
Air Mass Meter Boot
Wells Vehicle Electronics – Fuel Injection Pressure Regulator (Part No.5G1368)
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$58.99
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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Carquest Premium – Remanufactured Fuel Injector (Part No.A212-2015)
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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:
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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
Mahle – FI Throttle Body Mou (Part No.C700184802MAH)
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$14.36
FI Throttle Body Mou
Bosch – Fuel Injector Seal Kit (Part No.C106016844BOS)
from
$10.99
Bosch is one of the largest global suppliers of automotive products, developing, manufacturing and supplying precision OE components and systems to vehicle manufacturers and the automotive aftermarket. This 5-piece kit contains 3 O-rings (black), 1 support ring (gray), and 1 protective cap (yellow). Use one kit per injector.
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Carquest Premium – Fuel Injector Connector (Part No.PTA1064)
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$4.29
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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ACDelco – Fuel Injector Fuel Feed and Return Pipe O-Ring Kit with 2 O-Rings (Part No.217-3366)
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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:
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Product Features:
- Professional, premium aftermarket replacement
- Provides the performance and dependability you expect from ACDelco
- Manufactured to meet expectations for fit, form, and function
Bosch – Fuel Injector Seal (Part No.C101016838BOS)
from
$2.06
Bosch is one of the largest global suppliers of automotive products, developing, manufacturing and supplying precision OE components and systems to vehicle manufacturers and the automotive aftermarket.
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Elring – Fuel Injector O-Ring (Part No.C101262400ELR)
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$1.09
Fuel Injector O-Ring
Most Sold 2003 Audi A6 Gas Caps
Explore our best-selling Audi parts for the 2003 A6 among 4 OEM and aftermarket options starting from $12.99.
Carquest Premium – Locking Fuel Cap: 10505, Screw On, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10505)
from
$20.99
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:
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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
Carquest Premium – Fuel Cap: 10835, Screw On, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10835)
from
$12.99
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:
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Product Features:
- 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
Motorad – Tethered Fuel Cap (Part No.MGC835T)
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$15.99
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:
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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
A.P.A. URO – Fuel Tank (Gas) Cap (Part No.E2010237140APA)
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$34.87
APA/URO Fuel Tank Caps are manufactured to meet OE quality, and performance for reliable operation.
Product Features:
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Product Features:
- Meets OE vehicle standards
- Factory type retaining strap for user convenience
- OE quality seal ensures fuel tank emissions are maintained preventing check engine warnings.
Top-Rated Fuel and Emissions Systems Brands For Your 2003 Audi A6
Shop for the best-rated brands offering Fuel and Emissions Systems and other products for your 2003 Audi A6s. Below you’ll find some of our best rated Fuel and Emissions Systems from FELPRO and Bosch, and more. Fuel and Emissions Systems from these brands that fit a 2003 A6 start at just $2.06 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 2003 Audi A6 Fuel and Emissions Systems
When it comes to maintaining or upgrading your 2003 Audi A6, 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 2003 Audi A6. With over 2 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 $7.49, with an average price of just $7.64. 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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$7.49
$7.49
(109)
“Replaced the boring in my TBSS fuel injectors and there is no more leaks.”
Popular Bosch 2003 Audi A6 Fuel and Emissions Systems
Bosch auto parts is one of the highest quality Fuel and Emissions System brands in the market. Any 2003 Audi A6 owner should feel confident when installing genuine Bosch parts in their vehicle. To ensure the best fit and performance for your 2003 A6, Advance Auto Parts carries a full inventory of 10 Bosch Fuel and Emissions Systems. Plus you will be keeping your Audi in peak condition while saving money because prices on these Bosch Fuel and Emissions Systems range from $2.06 to $288.24, plus, with more than 146 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.
from
$131.99
$131.99
This product is not rated
Wideband Oxygen Sensor: 5 Wire, 28.74" Long, Heated, Exact Fit
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FAQs for 2003 Audi A6 Fuel and Emissions Systems
Which Fuel and Emissions Systems are best-sellers for 2003 Audi A6s?
Out of 61 Fuel and Emissions Systems that fit 2003 Audi A6s, the following parts are the top sellers:
- Fuel Injector O-Ring Kit (3504360) – $7.49
- Fuel Tank Cleaning Kit (11692237) – $12.49
- Fuel Cap: 10835, Screw On, Direct Fit, Provides Tight Seal, 1 Pack (18481526) – $12.99
What’s the price range for 2003 Audi A6 Fuel and Emissions Systems?
Fuel and Emissions System prices for the 2003 Audi A6 start at $1.09 and go up to $597.99 for the most premium parts.
What’s the average price of a Fuel and Emissions System for a 2003 Audi A6?
The average price for Fuel and Emissions Systems for the 2003 Audi A6 is $104.72. 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 Audi A6 model years?
What are the cheapest Fuel and Emissions Systems for my 2003 Audi A6?
The cheapest 2003 Audi A6 Fuel and Emissions Systems we carry in stock are:
- Fuel Injector O-Ring (12053420) – $1.09
- Fuel Injector Seal (10740455) – $2.06
- Fuel Injector Seal (11474383) – $2.51
- Fuel Injector Fuel Feed and Return Pipe O-Ring Kit with 2 O-Rings (11906761) – $3.29
- EGR Adapter Gasket (11647771) – $3.38
What types of Fuel and Emissions Systems do you sell for my 2003 Audi A6?
As of 2/5/25, these are some of the most in-demand types of Fuel and Emissions Systems for a 2003 Audi A6:
Can I get help with 2003 Audi A6 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 Audi Fuel and Emissions Systems and more.
What is your return policy for Audi A6 Fuel and Emissions Systems?
Advance Auto Parts keeps returns simple. For new Audi A6 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.
