2003 Audi A4 Quattro Fuel and Emissions Systems

Essential 2003 Audi A4 Quattro Fuel and Emissions Systems

Carquest Premium – Fuel Cap: 10844, Twist-Lock, Direct Fit, Provides Tight Seal, 1 Pack (Part No.10844)

Fuel Cap: 10844, Twist-Lock, Direct Fit, Provides Tight Seal, 1 Pack

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$39.49
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:
  • 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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Hitachi – Mass Air Meter (Part No.B3130127419HIT)

Mass Air Meter

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$334.42
Hitachi manufactures a direct fit Air Mass Meter that guarantees OEM quality, fit and performance.

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
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Rein – Thermo Switch (Part No.ELT0059)

Thermo Switch

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$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:
  • Tested to ensure maximum performance
  • Manufactured to strict engineering standards/specifications in materials and tolerances
  • Long life and durability
  • Made by the OE manufacturer
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Dorman – 30 AMP 12 Volt 4 Pin Universal Relay (Part No.84601)

30 AMP 12 Volt 4 Pin Universal Relay

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$9.99
This relay connector is designed to match the appearance and function of the original hardware on specified applications. Made of quality materials, it is engineered for reliable performance and durability.

Product Features:
  • Direct replacement – this relay connector matches the appearance and function of the factory hardware on specified applications
  • Ideal solution – this connector is a reliable replacement for an original part that is missing or has failed due to fatigue
  • Durable construction – this part is made from quality materials to ensure reliable performance and long service life
  • Trustworthy quality – backed by team of product experts in the United States and more than a century of automotive experience
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Kayser – Vacuum Check Valve (Part No.O404032232KAY)

Vacuum Check Valve

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$23.71
Vacuum Check Valve

Victor Reinz – Fuel Injection Throttle Body Mounting Gasket (Part No.71-16588-00)

Fuel Injection Throttle Body Mounting Gasket

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$9.99
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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Bosch – Air Temperature Sensors (Part No.C600084793BOS)

Air Temperature Sensors

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$30.12
Air Temperature Sensors measure the temperature of the incoming air to the engine. This information is provided to the Engine Control Module (ECU) to determine the correct amount of fuel needed for optimum performance and economy.

Product Features:
  • Extreme Temperature range: -40F – +260F
  • Robust Design with High Resistance to Engine Vibrations
  • OE or Better – Quality, Performance, and Function
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Vaico – Air Pump (Part No.B6010322330VCO)

Air Pump

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$297.71
Air Pump

Carquest Premium – Secondary Air Injection Pump Check Valve (Part No.EGA1181)

Secondary Air Injection Pump Check Valve

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$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.

Product Features:
  • Product constructed to meet all design and operating characteristics as intended by the vehicle manufacturer.
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DENSO – Oxygen Sensor: 4 Wire, 69.21" Long, Heated, Exact Fit (Part No.234-4874)

Oxygen Sensor: 4 Wire, 69.21" Long, Heated, Exact Fit

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$135.99
DENSO Oxygen 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; 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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Carquest Premium – Vapor Canister Purge Solenoid (Part No.CPC1244)

Vapor Canister Purge Solenoid

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$61.99
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 – Boost Pressure Sensor (Part No.C7044397109BOS)

Boost Pressure Sensor

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$59.41
All Bosch High Pressure Sensors provide very reliable and accurate measurements and have extremely fast response times to ensure your vehicle runs as intended.

Product Features:
  • Built-in circuit protection to ensure your electronics and computer systems stay unharmed
  • High reliability of pressure sensing proved in gasoline and diesel direct injection systems
  • Sturdy design, vibration resistant and thermal stability
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Carquest Premium – Multi Purpose Relay (Part No.RAA1792)

Multi Purpose Relay

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$16.79
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 – Multi Purpose Relay (Part No.RAA1319)

Multi Purpose Relay

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$9.49
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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APA/URO Parts – Suction Pump (Part No.B2045325720APA)

Suction Pump

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$42.02
The APA/URO PCV Suction Pump 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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Vaico – Q+ OE Quality Vacuum Non Return Check Valve (Part No.B2024299234VCO)

Q+ OE Quality Vacuum Non Return Check Valve

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$43.99
The Vaico Vacuum Non Return Check Valve is a high quality Original Equipment replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:
  • Made in Germany OE Quality
  • Premium Original Equipment replacement
  • Provides performance and dependability
  • Manufactured to meet OE specifications Q+ The Seal of Excellence
  • ALWAYS OEM QUALITY
  • ALWAYS MADE IN GERMANY
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Bosch – Bosch Purge Valve (Part No.B708062614BOS)

Bosch Purge Valve

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$50.77
The high-performance TEV canister purge valve constructed of plastic complies with all the requirements of manifold injection and gasoline direct injection.

Product Features:
  • Favorable price-to-performance ratio
  • Optimized triggering when minimal amounts are detected, giving quiet idling
  • Steeper rise of characteristic line
  • High maximum flow Installation on engine generates less noise
  • Integrated protective sieve prevents accumulation of dirt
  • Compact and light
  • Quick and simple fitting
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Delphi – Fuel Tank Cleaning Kit (Part No.FC01)

Fuel Tank Cleaning Kit

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$12.49
To perform a complete fuel pump replacement, clean the tank every time. Order the Delphi Fuel Tank Cleaning Kit (Part FC01). Remember, the original pump went into a clean fuel tank, to ensure the same level of performance, the new pump should too. 100 ye

Product Features:
  • Helps avoid premature fuel pump failure
  • Lint free towel included
  • Low suds formulation
  • Removes harmful contaminants from the fuel tank
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Bosch – Fuel Tank Sending Unit (Part No.E2030848445BOS)

Fuel Tank Sending Unit

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$75.99
The Bosch Fuel Tank Sending Unit 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 for fit, form, and function
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Bosch – Bosch Fuel Pressure Regulator (Part No.C300056477BOS)

Bosch Fuel Pressure Regulator

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$51.73
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:
  • 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
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Bosch – Fuel Injector O-Ring (Part No.C1012290582BOS)

Fuel Injector O-Ring

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$7.00
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. 9.3×2.62mm
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Elring – Elring EGR Valve Gasket (Part No.B7100180816ELR)

Elring EGR Valve Gasket

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$5.90
The Elring EGR Valve Gasket is a high quality Original Equipment replacement that is manufactured to meet or exceed OE specifications for fit, form, and function.

Product Features:
  • Premium Original Equipment replacement
  • Provides performance and dependability
  • Manufactured to meet OE specifications
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Rein – Breather Hose (Part No.B2010401031RIN)

Breather Hose

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$123.96
This OE quality breather hose is vehicle specific and a direct replacement for the original component. Rein automotive products provide you with the proper fit, form and function for European vehicles. With fitments for some of the world’s finest automobiles, including Audi, BMW, Mercedes Benz, Mini, Porsche, Saab, Volkswagen, and Volvo all Rein Automotive genuine replacement parts are guaranteed original manufacturer quality. Every part is manufactured with top quality materials to ensure it has the same tolerances as the part that came on the car to provide ease of installation and long lasting durability.

Product Features:
  • Original Equipment fit, form and function
  • Manufactured from premium raw materials
  • Premium OE design
  • Right fit the first time
  • For European vehicles
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Carquest Premium – Fuel Pump Module Assembly M2481938: Fuel Pump, Sending Unit and Strainer (Part No.M2481938)

Fuel Pump Module Assembly M2481938: Fuel Pump, Sending Unit and Strainer

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$599.99
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:
  • 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
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Carquest – Fuel Injector Seal Kit (Part No.274831)

Fuel Injector Seal Kit

from

$16.05
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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Elring – Fuel Injector Repair (Part No.C1040468293ELR)

Fuel Injector Repair

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$26.71
Fuel Injector Repair

Pierburg – EGR Vacuum Solenoid (Part No.B7008274290APG)

EGR Vacuum Solenoid

from

$111.91
EGR Vacuum Solenoid

2003 Audi A4 Quattro Fuel and Emissions Systems

You count on your 2003 Audi A4 Quattro to run right. That means taking care of it with regular maintenance, necessary repairs, and the right parts. Advance Auto Parts can help with all of that thanks to our extensive inventory of trusted Fuel and Emissions Systems. With 85 Fuel and Emissions Systems ranging in price from $1.07 to $597.99, you’re sure to find everything you need for your 2003 Audi A4 Quattro.

Brands matter. If you want to shop a specific Fuel and Emissions Systems brand, we stock 23 different brands like Felpro, Bosch, and Dorman. 2003 Audi A4 Quattro Fuel and Emissions Systems start as low as $1.07!

One of the best ways to find top quality OEM or aftermarket Fuel and Emissions Systems is by asking professionals. Short of that, you can shop with confidence thanks to our 1,130 extensive product reviews on 2003 Audi A4 Quattro Fuel and Emissions Systems. Some of the top-rated Fuel and Emissions Systems products we carry are Evaporative Emissions Purge Solenoid Valve with 4.5 stars and Mass Air Flow (MAF) Sensor with 5.0 stars.

Did we mention you can order your Fuel and Emissions Systems from our online catalog and have them shipped right to your garage? Or, if you feel like seeing the parts first-hand, search for your nearest Advance Auto Parts location above and pick up in-store when you’re ready. Browse our full Fuel and Emissions Systems inventory for your 2003 Audi A4 Quattro below to get started!

Top-Rated Fuel and Emissions Systems Brands For Your 2003 Audi A4 Quattro

Trusted Fuel and Emissions Systems OEM and aftermarket product brands are what Advance Auto Parts specializes in. The brands we work with are sure to keep that 2003 Audi A4 Quattro running right for years to come. In our inventory you’ll find brands like Felpro, Bosch, Dorman, and even more.

Popular Hitachi Fuel and Emissions Systems

You’ll find popular Hitachi brand products across Fuel Injectors. All are waiting to get your 2003 Audi A4 Quattro back on the road. Some of the top-rated Hitachi products in these categories are:
Mass Air Flow Sensor
from $164.99
(2)
Mass Air Flow Sensor
Air Flow Meters and Mass Air

Top-Rated Bosch Fuel and Emissions Systems


If Bosch are what you’re looking for, our inventory holds plenty. We stock Bosch brand Fuel and Emissions Systems for your 2003 Audi A4 Quattro, and some of our most reviewed Bosch parts include:

FAQs for 2003 Audi A4 Quattro Fuel and Emissions Systems

What are the most purchased Fuel and Emissions Systems for the 2003 Audi A4 Quattro?

Out of 85 Fuel and Emissions Systems for the 2003 Audi A4 Quattro, the most popular in our inventory are:
Fuel Injector O-Ring Kit
from $7.49
(109)
Fuel Injector O-Ring Kit
Fuel Injector O-Ring Kits
30 AMP 12 Volt 4 Pin Universal Relay
from $9.99
(8)
30 AMP 12 Volt 4 Pin Universal Relay
Vacuum Pump Relay
Fuel Tank Cleaning Kit
from $12.49
This product is not rated
Fuel Tank Cleaning Kit
Fuel Tank Cleaning Kits

What are the top-rated 2003 Audi A4 Quattro Fuel and Emissions Systems?

Top-rated Fuel and Emissions Systems for your 2003 Audi A4 Quattro based on customer reviews/ratings are:
Evaporative Emissions Purge Solenoid Valve
from $52.99
(11)
Evaporative Emissions Purge Solenoid Valve
“Fits my 07 Silverado 2500 classic, turned the EVAP code off. Old ones valve was stuck in the open position allowing vapor to constantly flow into the”
Mass Air Flow (MAF) Sensor
from $169.99
(2)
Mass Air Flow (MAF) Sensor
“I know the price is really high for this part, but if you want reliability, efficiency and performance to be as it should, do not skimp on your MAF an”
Fuel Cap: 10835, Screw On, Direct Fit, Provides Tight Seal, 1 Pack
from $12.99
(2)
Fuel Cap: 10835, Screw On, Direct Fit, Provides Tight Seal, 1 Pack
“After reaching the gas station and opening the door to the gas tank, I discovered my gas cap was not there. The check engine light came on the dash a ”