2003 Audi A6 Emission Control

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    • (0 reviews)
      # mpn1032497591
      Audi A6 Quattro 3.0L 2003, Secondary Air Injection Pump by URO Parts®. Position: Secondary. Make your vehicle operating quiet again by replacing your malfunctioning component with this top-notch emission control part. The dependable URO...
      Designed to replace your worn out exhaust partHelps to restore quiet vehicle operation
      $129.82
    • (0 reviews)
      # 311826200
      Audi A6 2003, Oxygen Sensor by Denso®. Denso's light duty oxygen sensor started to appear on vehicles with the development of fuel injection systems. The basic job of the sensor is to monitor the air fuel mixture under idle, moderate...
      Corrosion-resistant stainless steel constructionPTFE filter blocks efficiency-robbing contaminants
      $81.53 - $121.65
    • (0 reviews)
      # 585531834
      Audi A6 2003, Professional™ Oxygen Sensor by ACDelco®. If your O2 Sensor is not functioning properly, you are robbing yourself of performance and costing yourself money at the gas pump. Let ACDelco’s Professional Oxygen Sensors...
      ACDelco Professional Oxygen Sensors earn the name ACDelco by being put through a variety of tests, often under extreme and unusual conditionsCustomers can receive better gas mileage with a properly working oxygen sensor
      $72.05 - $129.02
    • (0 reviews)
      # 710426083
      Audi A6 2003, Air Fuel Ratio Sensor by Denso®. Position: Upstream. Make sure your engine runs efficiently and produces fewer emissions by replacing your malfunctioning fuel-ratio sensors with these top-notch products designed by Denso....
      Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
      $113.21
    • (0 reviews)
      # 22132235
      Audi A6 2003, Oxygen Sensor by NTK®. Thimble type sensors feature a ceramic element that projects into the exhaust system and becomes electrically conductive at high temperature. The sensor element then sends voltage signals back to the...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $75.10 - $103.85
    • (0 reviews)
      # mpn1741925475
      Audi A6 / A6 Quattro / Allroad Quattro 2003, Intermotor™ Vapor Canister by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices...
      OE quality parts from top original equipment and aftermarket manufacturersEach fuel vapor canister is designed and tested to OE specifications for a direct-fit replacement controlling the loss of evaporative emissions from fuel systems to the environment.
      $181.11
    • (0 reviews)
      # 22809611
      Audi A6 2003, Oxygen Sensor by Spectra Premium®. To ensure your vehicle has optimal performance and fuel economy while producing minimal emissions replace a defective O2 sensor with one backed by the aftermarket’s most rigorous...
      Increase vehicle fuel economy and engine performance while decreasing vehicle exhaust emissions100% performance tested to meet vehicle requirements
      $46.63 - $184.38
    • (0 reviews)
      # mpn53631001
      Audi A6 / A6 Quattro 3.0L 2003, TechSmart™ Engine Crankcase Vent Valve by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $87.36
    • (0 reviews)
      # 35540593
      Audi A6 2003, Secondary Air Injection Pump by Cardone®. Import. 100% testing of all units guarantees reliable performance every time. High temperature grease extends bearing life, resulting in longer pump life. New carbon shoes/vanes on...
      50-state emissions street legal100% testing of all units guarantees reliable performance every time.
      $111.03 - $273.98
    • (3 reviews)
      # 24139870
      Audi A6 2003, Premium Oxygen Sensor by Bosch®. A worn-out oxygen sensor can cause engine performance problems and shorten the life of the catalytic converter. Tune-up your vehicle with an Oxygen Sensor from Bosch that is equally...
      Up to 15 % savings in fuel costsReduced CO2 emissions
      $59.06 - $84.16
    • (0 reviews)
      # 24139896
      Audi A6 2003, Universal Fit Oxygen Sensor by Bosch®. Universal Oxygen Sensors with OE SmartLink are quick and easy to install. Each sensor has enough length of sensor wire to allow maximum replacement of worn harnesses. Properly...
      Patented SmartLink™ connector systemNo special tools required for installation
      $39.85
    • (0 reviews)
      # 24139889
      Audi A6 2003, Wideband Oxygen Sensor by Bosch®. Position: Upstream. This sensor utilizes a sophisticated sensing element enabling it to produce a precise output in proportion to the air/fuel ratio. Wideband sensors use a more...
      Detects the exact amount of unburned fuel in the exhaust streamOE connectors and OE-style harness for continuous wire from connector to sensor
      $103.70
    • (0 reviews)
      # 152241002
      Audi A6 2003, Air Fuel Ratio Sensor by NTK®. Air/Fuel Ratio Sensors Utilize a Sophisticated Sensing Element that Enables Them to Produce a Precise Output in Proportion to the Air/Fuel Ratio. AFR Sensors Provide the ECU with an Exact AFR...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $99.16 - $109.20
    • (0 reviews)
      # 81757294
      Audi A6 2003, Oxygen Sensor by Delphi®. As one of the leading suppliers of oxygen sensor technology since 1978, Delphi planar technology is the result of their OE and aftermarket engineers partnering together to develop the most...
      OE connectors and wire lengths within 3" of OE specificationsResists high temperatures, vibration damage and wire corrosion to protect signal accuracy, and long life
      $61.11 - $109.28
    • (0 reviews)
      # 138863650
      Audi A6 2003, Oxygen Sensor by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker...
      Makes installation quick and easyOptimal OE-style fit and quality
      $106.46 - $125.56
    • (0 reviews)
      # 1060536510
      Audi A6 2003, Oxygen Sensor by Aceon®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...
      Designed to provide long-lasting service lifeMade utilizing state-of-the-art equipment
      $22.08 - $53.98
    • (0 reviews)
      # mpn53630838
      Audi A6 / A6 Quattro / Allroad Quattro 2003, Intermotor™ PCV Valve by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $88.69
    • (0 reviews)
      # mpn4476106318
      Audi A6 Quattro 4.2L 2003, Engine Crankcase Vent Valve by Gates®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle's emissions control system is in need of repair, but before you waste your...
      Resistant to fuel vapors and oilDirect replacement ensures exact fit and easy installation
      $64.75
    • (0 reviews)
      # 52274943
      Audi A6 2003, PCV Valve by Beck Arnley®. For one hundred years, Beck/Arnley has been providing premium OE quality parts for vehicles. Beginning with motorcycle parts in 1914 and transitioning to import vehicles in the 1950’s, brand...
      OE quality products from top original equipmentTop quality materials
      $57.73 - $85.65
    • (0 reviews)
      # 990524942
      Audi A6 2003, Crankcase Ventilation Valve by Febi®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...
      24 Months/24,000 Miles WarrantyThe finest quality at a great price
      $48.53
    • (0 reviews)
      # mpn4478342781
      Audi A6 Quattro / Allroad Quattro 2.7L 2003, Secondary Air Injection Pump by Bosch®. Designed utilizing the latest technology, this product by Bosch features premium quality and will perform better than advertised. Perfect for your...
      100% new, not rebuiltOE design to ensure exact fit, form and function
      $199.14
    • (0 reviews)
      # 326293775
      Audi A6 2003, Secondary Air Injection Pump by Dorman®. Dorman’s A.I.R. Pump comes with all the hardware and other components necessary for a complete repair. Since this part is a direct replacement, the exact fit adds another layer of...
      Save money by replacing only the failed pump - instead of the entire mating cover assemblyReplacement restores A.I.R. System to proper functioning
      $408.95 - $475.95
    • (0 reviews)
      # 88067509
      Audi A6 Quattro / Allroad Quattro Base 2.7L Engine Family # 3ADXV02.7343 2003, CalCat™ Catalytic Converter by Walker®. Emissions: CARB compliant. Converter Configuration: Universal Fit. With 1 Inlet. Without Air Tube. With O2 Sensor...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $119.35 - $131.13
    • (0 reviews)
      # mpn1806778
      Audi A6 Quattro Base 4.2L 2003, Ultra™ Catalytic Converter by Walker®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Position: Driver Side. Catalytic Converter Body Shape: Round. With 1 Inlet. Without Air Tube....
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $71.19
    • (0 reviews)
      # 111789328
      Audi A6 3.0L Engine Family # 3ADXV03.0344 2003, ECO CARB Undercar Catalytic Converter and Pipe Assembly by Eastern®. Emissions: CARB compliant. Converter Configuration: Direct Fit. With 2 O2 Sensor Ports. Two Way Catalytic. If you need...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $294.82 - $314.43
    • (0 reviews)
      # 286167872
      Audi A6 2003, ECO III Catalytic Converter and Pipe Assembly by Eastern®. Emissions: EPA compliant. Converter Configuration: Direct Fit. If you need to replace your failed or damaged catalytic converter, this product is the right choice....
      Direct OEM replacementDesigned with twice the amount of Rhodium to help keep the MIL off on vehicles with high mileage, low emissions, or higher than normal emissions
      $268.53 - $336.65
    • (0 reviews)
      # 252880481
      Audi A6 2003, Catalytic Converter by Eastern®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Oval. Without Air Tube. Whether your catalytic converter is damaged by road debris or failed due to an engine...
      Converts harmful engine emissions to less dangerous gases and water vaporAdvanced design for maximum engine output
      $34.97 - $80.41
    • (0 reviews)
      # 81395960
      Audi A6 2003, 608 Series Catalytic Converter by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. With 1 Driver Side O2 Sensor Port. Catalytic Inlet...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $87.38
    • (0 reviews)
      # 80124641
      Audi A6 2003, Catalytic Converter and Pipe Assembly by AP Exhaust®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Without Air Tube. The growing concern for the environment means there is a growing need for quality...
      5-year/50,000-mile warranty on converter body25,000-mile warranty on emissions
      $365.58 - $451.50
    • (0 reviews)
      # 621841125
      Audi A6 2003, Catalytic Converter by AP Exhaust®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Without Air Tube. Three-Way No / Air OBDII By Design US-EPA Compliant catalytic converters are efficient at the...
      A multitude of Universal converter bodies provided for maximum coverageProvides professional installer with immediate installation options
      $132.11 - $188.62
    • (0 reviews)
      # mpn615928968
      Audi A6 Quattro 4.2L Engine Family # 3ADXV04.2345 with LEV Standard / with LEV1 Standard 2003, Catalytic Converter by DEC®. Emissions: CARB compliant. Converter Configuration: Direct Fit. Position: Passenger Side. Pick out a catalytic...
      Direct fitMade from a heavy duty stainless steel outer shell
      $684.01
    • (0 reviews)
      # 86067282
      Audi A6 2003, Catalytic Converter and Pipe Assembly by DEC®. Converter Configuration: Direct Fit. Pick out a catalytic converter by DEC and get your emissions back into check without worrying to fail again. These catalytic converters...
      Direct fitMade from a heavy duty stainless steel outer shell
      $348.43 - $684.01
    • (0 reviews)
      # 545969059
      Audi A6 2003, Catalytic Converter and Pipe Assembly by Davico®. Converter Configuration: Direct Fit. This direct-fit catalytic converter by Davico will be a great solution to replace your failed or damaged catalytic converter. Once your...
      Helps your vehicle emit harmless gasesDirect OEM replacement
      $281.72 - $566.06
    • (0 reviews)
      # 898715507
      Audi A6 with PC Weight Class with California Emission with LEV1 Standard 2003, Catalytic Converter by Davico®. Emissions: CARB compliant. Converter Configuration: Universal Fit. This Universal fit catalytic converter by Davico will be a...
      $246.05
    • (0 reviews)
      # 380743312
      Audi A6 2003, Heavy Metal Catalytic Converter by MagnaFlow®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Without Air Tube. Catalytic Outlet Diameter: 2.25". If your car needs replacement, install one that will get you...
      $325.04 - $485.27
    • (0 reviews)
      # 98374729
      Audi A6 2003, Heavy Metal Catalytic Converter by MagnaFlow®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. Catalytic Inlet Diameter: 2.25". Catalytic Outlet...
      $100.27 - $113.92
    • (0 reviews)
      # 18314335
      Audi A6 with LEV Standard / with LEV1 Standard 2003, OBDII Catalytic Converter by MagnaFlow®. Emissions: CARB compliant. Converter Configuration: Universal Fit. Without Air Tube. OEM Spec. If your car needs a new catalytic converter,...
      $159.99 - $185.78
    • (0 reviews)
      # 380743313
      Audi A6 2003, OEM Grade Catalytic Converter by MagnaFlow®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Without Air Tube. Catalytic Outlet Diameter: 2.25". If your car needs replacement, install one that will get you...
      $454.75 - $542.54
    • (0 reviews)
      # 49708805
      Audi A6 2003, OEM Grade Catalytic Converter by MagnaFlow®. Emissions: EPA compliant. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. Catalytic Inlet Diameter: 2.25". Catalytic Outlet...
      $122.43 - $154.65
    • (0 reviews)
      # 784262476
      Audi A6 2003, Crankcase Breather Hose by Vaico®. Quality results from the consistent pursuit of an customer-focused strategy. Clients wishes are in the center of business. Vaico aim: the best quality for your satisfaction. As a result,...
      Designed to provide long-lasting service lifeMade utilizing state-of-the-art equipment
      $68.02 - $193.63
    • (0 reviews)
      # 784265043
      Audi A6 2003, Cylinder Head Cover Breather Hose by Vaico®. Block Tube to Left and Right Cylinder Heads. Quality results from the consistent pursuit of an customer-focused strategy. Clients wishes are in the center of business. Vaico...
      Designed to provide long-lasting service lifeMade utilizing state-of-the-art equipment
      $86.58
    • (0 reviews)
      # mpn4494287591
      Audi A6 Quattro 4.2L 2003, Engine Block Breather Valve by Vaico®. Quality results from the consistent pursuit of an customer-focused strategy. Clients wishes are in the center of business. Vaico aim: the best quality for your...
      Designed to provide long-lasting service lifeMade utilizing state-of-the-art equipment
      $27.56
    • (0 reviews)
      # 263924579
      Audi A6 2003, Intermotor™ Vapor Canister Purge Solenoid by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $23.81 - $85.10
    • (1 review)
      # 16873510
      Audi A6 2003, Vapor Canister Purge Valve by Dorman®. Location: Near Intake Manifold. Dorman's Vapor Canister Purge Valve restores on-board diagnosis of the EVAP system. Plus, its high quality metal and plastic construction keeps the...
      Designed for enduring resistance to harsh road and weather conditionsDirect replacement for a proper fit every time
      $19.74
    • (0 reviews)
      # 939727245
      Audi A6 2003, Purge Valve by Pierburg®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs and deliver great...
      24 Months/24,000 MilesMade to provide unequaled quality and reliability
      $42.03
    • (0 reviews)
      # mpn4495526373
      Audi Allroad Quattro 2003, EGR Vacuum Solenoid by Pierburg®. N249. "Diesel" and "downsizing" are terms that largely account for the popularity of electropneumatic transducers, a prime mainstay of Pierburg's sales. These are devices...
      High quality at an affordable priceExpertly made from premium materials
      $54.79
    • (0 reviews)
      # 263924569
      Audi A6 2003, Intermotor™ Secondary Air Injection Bypass Valve by Standard®. SMP’s vision is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $143.03 - $195.11
    • (0 reviews)
      # 326293768
      Audi A6 2003, Secondary Air Injection Check Valve by Dorman®. Keep your vehicle’s emission control system in top-notch condition with superior Dorman replacement emission control parts. Manufactured from top-grade materials using...
      Manufactured from premium grade materialsBuilt to provide exceptional OE quality and function
      $175.53 - $180.55
    • (0 reviews)
      # 354417408
      Audi A6 2003, Emission Check Valve by URO Parts®. Make your vehicle operating quiet again by replacing your malfunctioning component with this top-notch emission control part. The dependable URO part will make your exhaust system work...
      High quality plastic and/or steel constructionDirect replacement for a proper fit every time
      $3.29
    • (0 reviews)
      # 1079443044
      Audi Allroad Quattro 2003, Air Pump Check Valve by Pierburg®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your needs...
      $86.00 - $94.44
    • (0 reviews)
      # 476325244
      Audi A6 2003, Breather Hose by Dorman®. Keep your vehicle’s emission control system in top-notch condition with superior Dorman replacement emission control parts. Manufactured from top-grade materials using advanced technologies,...
      Easy to installDirect replacement for a proper fit
      $13.46
    • (0 reviews)
      # mpn4476106307
      Audi A6 / A6 Quattro 3.0L 2003, Engine Crankcase Breather Hose Kit by Gates®. OE Exact Crankcase Ventilation and Emission hose is constructed from high quality materials for durability and maximum service life. Replacement hose...
      Resistant to fuel vapors and oilDirect replacement ensures exact fit and easy installation
      $114.51
    • (0 reviews)
      # mpn4489688866
      Audi A6 Quattro 2.7L 2003, Crankcase Breather F-Hose by 034Motorsport®. 034Motorsport's Silicone F-Hose for the 2.7T is a direct fit for all APB engines with a factory f-hose. This part replaces the failure-prone factory rubber hose...
      24 Months WarrantyMade to provide unequaled quality and reliability
      $18.45
    • (0 reviews)
      # mpn4507285161
      Audi Allroad Quattro 2003, EGR Valve Gasket by Elring®. Position: Passenger Side. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle's emissions control system is in need of repair, but before...
      High quality at an affordable priceExpertly made from premium materials
      $1.75
    • (0 reviews)
      # 24055617
      Audi A6 2003, Secondary Air Injection Pump Gasket by Victor Reinz®. This product is made of high-quality materials to serve you for years to come. Designed using state-of-the-art technology and with customers in mind. It will meet your...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $3.23
    • (0 reviews)
      # 619723362
      Audi A6 2003, Secondary Air Injection Pump Mount by Aftermarket®. Is your CHECK ENGINE light on? Has your vehicle failed a state emissions test? Your vehicle's emissions control system is in need of repair, but before you waste your...
      High quality at an affordable priceExpertly made from premium materials
      $3.45
    • (0 reviews)
      # 1079468060
      Audi A6 2003, Crankcase Vent Valve by Genuine®. Genuine is here to give you the ultimate in quality and reliability at a cost you can afford. Designed utilizing the latest technologies and manufactured from premium materials using...
      Carefully crafted to provide optimum performanceMade from premium materials to last
      $110.32 - $131.16
    • (0 reviews)
      # mpn4524528996
      Audi Allroad Quattro 2.7L Automatic Transmission 2003, Catalytic Converter by PaceSetter®. Emissions: EPA compliant. Converter Configuration: Direct Fit. Position: Passenger Side. Catalytic Converter Overall Length: 43.375". If you want...
      Direct-Fit Catalytic Converters are a direct replacement for original equipmentManufactured using mandrel-bent 16-gauge and stainless steel tubing
      $323.83
    • (0 reviews)
      # 1083577752
      Audi A6 2003, Catalytic Converter and Pipe Assembly by PaceSetter®. Emissions: EPA compliant. Converter Configuration: Direct Fit. If you want to get the most out of your vehicle, this PaceSetter product is second to none. Engineered...
      Direct-Fit Catalytic Converters are a direct replacement for original equipmentManufactured using mandrel-bent 16-gauge and stainless steel tubing
      $270.87 - $338.41
    • (0 reviews)
      # 1091837828
      Audi A6 3.0L Automatic CVT Transmission 2003, Exhaust Manifold with Integrated Catalytic Converter by PaceSetter®. Emissions: EPA compliant. PaceSetter Manifold Catalytic Converters are custom-engineered to deliver maximum performance...
      Manifold Catalytic Converters are a direct replacement for original equipmentManufactured using mandrel-bent stainless steel tubing for a low restriction tubular manifold design
      $274.86




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    • Replacement Emission Control Parts
      August 18, 2014
      Oxygen Sensors - Why Does My Car Have Four, And...
      An oxygen sensor (also known as an O2 sensor or Lambda sensor) is a sensor designed to generate a reading based on the content of oxygen in an automotive exhaust...
      by Michael Grayen
    • Ignition Parts
      August 10, 2014
      Auto Parts: Dealer vs. Aftermarket
      The question of whether to buy parts from an automotive dealer vs. ones from aftermarket manufacturers is as age-old as the automobile itself. Below, we'll take a look...
      by Timothy Zahl

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