Audi S4 Emission Control Parts

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    • (18 reviews)
      # sp99082
      OE Connector 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...
      Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
      $10.75 - $362.09
    • (2 reviews)
      # sp27211
      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 help. You can find...
      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
      $16.81 - $221.70
    • (4 reviews)
      # sp94914
      Air Fuel Ratio Sensor by Denso®. 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. Engineered with the use of the...
      Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
      $36.18 - $370.04
    • (0 reviews)
      # sp107264
      Secondary Air Injection Pump by Genuine®. 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...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $294.24 - $868.97
    • (13 reviews)
      # sp5156
      Oxygen Sensor by NTK®. This product is designed to improve engine efficiency and fuel mileage, while reducing emissions and extending catalyst life. The oxygen sensor is made of premium quality material and extensively tested during...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $11.68 - $173.44
    • (2 reviews)
      # sp107310
      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 and the highest reputation for integrity to...
      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
      $24.28 - $724.46
    • (3 reviews)
      # sp99297
      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 testing process. It...
      Increase vehicle fuel economy and engine performance while decreasing vehicle exhaust emissions100% performance tested to meet vehicle requirements
      $9.50 - $724.60
    • (0 reviews)
      # sp12660
      Oil Separator 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 as it should and help...
      Designed to replace your worn out exhaust partHelps to restore quiet vehicle operation
      $15.29 - $91.08
    • (0 reviews)
      # sp118924
      Universal Fit Oxygen Sensor by Denso®. 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. Engineered with the use of...
      Designed to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies
      $11.24 - $65.70
    • (0 reviews)
      # sp119178
      Universal Oxygen Sensor by Bosch®. Properly functioning oxygen sensors are important when it comes to your vehicle's fuel efficiency and reducing harmful exhaust emissions. That's why checking for, and possibly replacing, a worn-out...
      Patented SmartLink™ connector systemNo special tools required for installation
      $14.19 - $71.07
    • (3 reviews)
      # sp92988
      Wideband Oxygen Sensor by Bosch®. Invented for life, Bosch car parts are a rare combination of high quality, dependable service, and a reasonable price. This sensor utilizes a sophisticated sensing element enabling it to produce a...
      Detects the exact amount of unburned fuel in the exhaust streamOE connectors and OE-style harness for continuous wire from connector to sensor
      $50.55 - $327.53
    • (0 reviews)
      # sp121602
      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 Response,...
      Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement
      $37.19 - $367.84
    • (0 reviews)
      # sp5756
      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 innovative oxygen...
      OE connectors and wire lengths within 3" of OE specificationsResists high temperatures, vibration damage and wire corrosion to protect signal accuracy, and long life
      $12.75 - $209.93
    • (0 reviews)
      # sp26976
      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 accessories, you get...
      Makes installation quick and easyOptimal OE-style fit and quality
      $25.64 - $292.28
    • (3 reviews)
      # sp137457
      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 industry-leading materials...
      Designed to provide long-lasting service lifeMade utilizing state-of-the-art equipment
      $9.81 - $56.43
    • (0 reviews)
      # sp146761
      Oxygen Sensor by Maneki®. 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 industry-leading materials...
      Made to deliver second to none quality and absolute reliabilityBuilt to provide the ultimate in reliability and strength
      $12.17 - $17.88
    • (0 reviews)
      # sp13671
      PCV Valve by Dorman®. Dorman has all the components needed for a complete repair. Quickly and easily installed, it eliminates the clunking noise that may result when this part fails, while restoring original ride control.
      Easy to installDirect replacement for a proper fit
      $9.70 - $70.65
    • (0 reviews)
      # sp110104
      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 state-of-the-art...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $16.17 - $370.03
    • (0 reviews)
      # sp107286
      PCV Valve Kit 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 as it should and help...
      High quality plastic and/or steel constructionDirect replacement for a proper fit every time
      $5.99 - $199.59
    • (0 reviews)
      # sp110119
      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 time and gas running out to...
      High quality at an affordable priceExpertly made from premium materials
      $13.05 - $63.33
    • (2 reviews)
      # sp6407
      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 understands...
      OE quality products from top original equipmentTop quality materials
      $1.95 - $97.57
    • (0 reviews)
      # sp107278
      PCV Valve by Vaico®. 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 time and gas running out to the auto parts chain...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $8.21 - $211.75
    • (0 reviews)
      # sp107273
      Vapor Canister 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 state-of-the-art...
      OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price
      $46.64 - $807.64
    • (1 review)
      # sp97229
      EGR Valve by Pierburg®. 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 time and gas running out to the auto parts...
      High quality at an affordable priceExpertly made from premium materials
      $102.24 - $234.73
    • (0 reviews)
      # sp109037
      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 vehicle and lifestyle, it is manufactured to meet...
      100% new, not rebuiltOE design to ensure exact fit, form and function
      $129.53 - $710.13
    • (1 review)
      # sp10059
      Ultra™ Universal Fit Catalytic Converter by Walker®. Walker offers complete coverage: direct-fit mufflers, converters, pipes, resonators and accessories. Walker is an OE supplier to many major nameplate vehicle manufacturers. Trust...
      EPA & CARB Emissions Products Available for Most Vehicles5 Year / 50,000 Miles Warranty on Structural Components
      $53.67 - $122.75
    • (6 reviews)
      # sp4304
      Universal Fit Catalytic Converter by Walker®. Walker offers complete coverage: direct-fit mufflers, converters, pipes, resonators and accessories. Walker is an OE supplier to many major nameplate vehicle manufacturers. Trust Walker, an...
      EPA & CARB Emissions Products Available for Most VehiclesEmission, Structural Warranty: 5 Years / 50,000 Miles (80,000 Kilometers)
      $59.21 - $259.61
    • (2 reviews)
      # sp128208
      ECO III Direct Fit Converter and Pipe Assembly by Eastern®. If you need to replace your failed or damaged catalytic converter, this product is the right choice. Designed specifically for your vehicle, this catalytic converter is a great...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $116.57 - $631.04
    • (0 reviews)
      # sp4295
      Universal Fit Catalytic Converter by Eastern®. Whether your catalytic converter is damaged by road debris or failed due to an engine problem, you definitely need a new one, and this product is the way to go. Made of stainless steel, the...
      Converts harmful engine emissions to less dangerous gases and water vaporAdvanced design for maximum engine output
      $33.45 - $245.69
    • (1 review)
      # sp94077
      Catalytic Converter by AP Exhaust®. 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 quality...
      Provides professional installer with immediate installation optionsSpecifically engineered for OBDII equipped vehicles
      $51.78 - $300.33




    The Audi S4 is a high-performance modification of Audi’s compact luxury A4 model. Manufactured from 1991 through 1994, originally the Audi S4 was a performance-oriented version of the Audi 100 sedan. Since 1997, Audi S4 cars have been built on the basis of the Audi A4. This model is available in three body styles: a five-door and five-seat station wagon (Avant), a four-door and five-seat sedan and a two-door and four-seat convertible. All the Audi S4 models have front-mounted engines. The Quattro all-wheel drive system (4WD) is standard in this model.

    Our team provides you with a great selection of top scale Audi S4 emission control parts produced exactly for your vehicle. Cooperating with the foremost aftermarket brands in the field, we ensure unsurpassed quality of every part from our wide product range. Bosch, Delphi, Spectra Premium, etc. are only some of the numerous brands supplying our digital shop with first-rate quality units. Reliable oxygen sensors, vacuum suction pumps, vapor canister purge valves and a great deal of other parts made from premium materials are sure to maintain excellent operation of your emission control system. Great quality, high durability, swift delivery and quality service are accompanied with really moderate prices. All that turns shopping with us into an enjoyable process.

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