2004 Audi A4 Emission Control Parts
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TRQ®O2 Oxygen SensorAudi A4 / A4 Quattro 2004, O2 Oxygen Sensor by TRQ®. TRQ oxygen sensors are manufactured to precise specifications using premium raw materials to optimize your vehicle’s emission system. Each sensor is isostatically-pressed for...Intended to bring your vehicle back to its original gloryBudget-friendly alternative to the OEM part$35.95Save: 5%$34.15 - Cardone Reman®Secondary Air Injection PumpAudi A4 / A4 Quattro 2004, Secondary Air Injection Pump by Cardone Reman®. Import. Cardone Remanufactured Smog Pumps are engineered for quick installation and no comebacks. These pumps come with all necessary components for easy...100% testing of all units guarantees reliable performance every timeHigh temperature grease extends bearing life, resulting in longer pump life$189.92
- Standard®PCV ValveAudi A4 2004, PCV Valve by Standard®. Standard 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 all channels...Made with precision and quality in mindDesigned to meet your specific needs$47.69 - $150.29
- Genuine®Vapor CanisterAudi A4 / A4 Quattro 2004, 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...Made with precision and quality in mindDesigned to meet your specific needs$191.47 - $639.95
- URO Parts®New Secondary Air Injection PumpAudi A4 / A4 Quattro 2004, New 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...Designed to replace your worn out exhaust partHelps to restore quiet vehicle operation$99.44
- TRQ®Secondary Air Injection PumpAudi A4 / A4 Quattro 2004, Secondary Air Injection Pump by TRQ®. If you secondary air injection pump has gone bad, replace it with this top-notch part to keep your vehicle working properly. Engineered for quick and simple installation,...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$138.95Save: $6.95 (5%)$132.00
- Dorman®OE Solutions™ Secondary Air Injection PumpAudi A4 / A4 Quattro 1.8L / 3.0L Gas 2004, OE Solutions™ 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...Save money by replacing only the failed pump - instead of the entire mating cover assemblyReplacement restores A.I.R. System to proper functioning$313.63
- Vaico®PCV ValveAudi A4 3.0L 2004, PCV Valve by Vaico®. Designed utilizing the latest technology, this product by Vaico features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is manufactured to...Made with precision and quality in mindDesigned to meet your specific needs$39.45
- Standard®Intermotor™ PCV ValveAudi A4 / A4 Quattro 2004, Intermotor™ PCV Valve by Standard®. Standard is to be the leading independent supplier to the automotive aftermarket, providing the highest quality products, competitive prices and the highest reputation for...Made with precision and quality in mindDesigned to meet your specific needs$41.80 - $73.31
- WVE®PCV ValveAudi A4 2004, PCV Valve by WVE®. WVE emissions products are made to meet or exceed vehicle manufacturer specifications to work in concert with the fuel system, underhood electronics and the engine to minimize emissions of environmental...Excellent replacement for your worn-out factory partDesigned to keep your vehicle running reliably mile after mile$49.06 - $179.00
- Original (OEM)Emission Control PartsAlong with power, your engine produces carbon monoxide, oxide of nitrogen, hydrocarbons, and other hazardous gases that cause harm to the environment. To minimize air pollution, all vehicles are equipped with an emission control system...
- Audi OEEmission System - Emission Components (1.8L)Audi A4 1.8L 2004, Emission System - Emission Components by Audi OE. Keep your Audi looking showroom-new and running at its best with top-grade Audi OE parts. Genuine in quality, fit, and finish, they’re the finest option to go if you...Genuine OE replacement for your specific Audi modelDesigned to bring your vehicle back to its pristine condition$12.59 - $1,041.50
- Audi OEEmission System - Emission Components (1.8L)Audi A4 1.8L 2004, Emission System - Emission Components by Audi OE. Keep your Audi looking showroom-new and running at its best with top-grade Audi OE parts. Genuine in quality, fit, and finish, they’re the finest option to go if you...Genuine OE replacement for your specific Audi modelDesigned to bring your vehicle back to its pristine condition$3.64 - $1,041.50
- Audi OEEmission System - Emission Components (3.0L)Audi A4 3.0L 2004, Emission System - Emission Components by Audi OE. Keep your Audi looking showroom-new and running at its best with top-grade Audi OE parts. Genuine in quality, fit, and finish, they’re the finest option to go if you...Genuine OE replacement for your specific Audi modelDesigned to bring your vehicle back to its pristine condition$12.59 - $1,041.50
- Audi OEEmission System - Emission Components (3.0L)Audi A4 / A4 Quattro 3.0L 2004, Emission System - Emission Components by Audi OE. Keep your Audi looking showroom-new and running at its best with top-grade Audi OE parts. Genuine in quality, fit, and finish, they’re the finest option...Genuine OE replacement for your specific Audi modelDesigned to bring your vehicle back to its pristine condition$12.59 - $1,041.50
- Dorman®New OE Solutions™ PCV ValveAudi A4 / A4 Quattro 1.8L 2004, New OE Solutions™ PCV Valve by Dorman®. Standard Replacement. This PCV valve kit includes necessary components for repairing an original equipment PCV valve on certain vehicle applications.Complete kit - this PCV valve kit includes all components needed to repair valve right the first timeApplication specific - components designed to replace original components on certain vehicles$36.62
- SKP®PCV ValveAudi A4 / A4 Quattro 1.8L 2004, PCV Valve by SKP®. 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...High quality at an affordable priceExpertly made from premium materials$11.05
- Kayser®PCV ValveAudi A4 2004, PCV Valve by Kayser®. The production and development of filters for the automotive industry has been a tradition in company. Since 1960 Kayser have been active in this business field and have gained a much expertise...High-grade design and construction built to last for yearsPerfect for use in high-speed environments$51.96 - $75.63
- WVE®Vapor CanisterAudi A4 / A4 Quattro 2004, Vapor Canister by WVE®. WVE emissions products are made to meet or exceed vehicle manufacturer specifications to work in concert with the fuel system, underhood electronics and the engine to minimize emissions...Excellent replacement for your worn-out factory partDesigned to keep your vehicle running reliably mile after mile$734.50
- Bosch®Narrow-band Oxygen SensorAudi A4 / A4 Quattro 2004, Narrow-band Oxygen Sensor by Bosch®. Position: Downstream. 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...OE-EquivalentOE Style connectors and wire lengths$50.81
- URO Parts®New Engine Crankcase Vent ValveAudi A4 / A4 Quattro 3.0L Gas 2004, New Engine Crankcase Vent 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...Designed to replace your worn out exhaust partHelps to restore quiet vehicle operation$36.96
- Dorman®OE Solutions™ Vapor Canister Purge ValveAudi A4 / A4 Quattro 2004, OE Solutions™ Vapor Canister Purge Valve by Dorman®. Location: Near Intake Manifold. Engineered for a perfect fit and plug-and-play installation, this vapor canister purge valve is a direct replacement for...Direct replacement - this vapor canister purge valve fits and functions like original equipment to ensure proper function of your vehicle's evaporative emissions systemQuality construction - manufactured from premium materials for a long service life$30.06
- Denso®Oxygen SensorAudi A4 / A4 Quattro 1.8L / 3.0L Gas 2004, Oxygen Sensor by Denso®. Position: Downstream. Make sure your engine runs efficiently and produces fewer emissions by replacing your malfunctioning fuel-ratio sensors with these top-notch...High quality plastic and/or steel constructionDirect replacement for a proper fit every time$80.76
- Walker Products®Oxygen SensorAudi A4 2004, Oxygen Sensor by Walker Products®. 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...High quality at an affordable priceExpertly made from premium materials$64.75 - $117.86
- Bosch®Premium Oxygen SensorAudi A4 2004, 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...OE Identical ConnectorCompact Design$83.19 - $87.03
- Denso®Air Fuel Ratio SensorAudi A4 / A4 Quattro 2004, 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 to help reduce fuel consumption and harmful emissionsMade with the use of state-of-the-art sensor technologies$135.94 - $162.87
- Walker Products®Premium Oxygen SensorAudi A4 / A4 Quattro 2004, Premium Oxygen Sensor by Walker Products®. Walker Oxygen Sensors are precision made for outstanding performance and manufactured to meet or exceed all original equipment specifications and test requirements....Improved Engine Response & PerformanceLower Emissions$82.14
- NTK®Oxygen SensorAudi A4 / A4 Quattro 2004, 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...Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement$77.94
- NTK®Air Fuel Ratio SensorAudi A4 / A4 Quattro 2004, 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...Increases vehicle fuel economy and engine performance while decreasing vehicle exhaust emissionsDirect replacement$110.11 - $127.39
- Gates®Engine Crankcase Vent ValveAudi A4 / A4 Quattro 1.8L 2004, Engine Crankcase Vent Valve by Gates®. This product is made of high-quality components to meet and exceed strict quality requirements. Designed using state-of-the-art technology and with customers in...OE quality parts from top original equipment and aftermarket manufacturersThe finest quality at a great price$55.74
Shop By Service Type
- Oxygen Sensor Replacement
- Air Pump Check and Diverter Valve Replacement
- Canister Purge Solenoid Replacement
- Air Pump Check Valve Replacement
- Positive Crankcase Ventilation (PCV) Valve Replacement
- Positive Crankcase Ventilation (PCV) Valve Hose Replacement
- Fuel Evaporative Canister Replacement
- Secondary Air Injection Hose Replacement
- Air Injection System Control Valve Replacement
- Secondary Air Injection System Air Bypass Valve Replacement
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