2004 Audi A4 Emission Control Parts
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Davico®Direct Fit Catalytic ConverterAudi A4 / A4 Quattro 1.8L 2004, Catalytic Converter by Davico®. Converter Configuration: Direct Fit. Catalytic Converter Overall Length: 16.75". This direct-fit catalytic converter by Davico will be a great solution to replace your...$209.85 - $354.48 - Davico®Direct Fit Catalytic Converter and Pipe AssemblyAudi A4 3.0L Gas 2004, 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....$417.50 - $647.89
- AP Exhaust®Direct Fit Catalytic ConverterAudi A4 1.8L 2004, Catalytic Converter by AP Exhaust®. Converter Configuration: Direct Fit. Today’s exhaust performance market continues to cover a broad spectrum of vehicles. The unique nature of this market is that a product demand...$546.66 - $863.72
- MagnaFlow®Heavy Metal Universal Fit Round Body Catalytic ConverterAudi A4 2004, Heavy Metal Catalytic Converter by MagnaFlow®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. If your car needs a new catalytic converter, install one that will get you...$182.00 - $188.00
- MagnaFlow®OEM Grade Universal Fit Round Body Catalytic ConverterAudi A4 2004, OEM Grade Catalytic Converter by MagnaFlow®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. If your car needs a new catalytic converter, install one that will get you...$197.00 - $202.00
- MagnaFlow®Heavy Metal Direct Fit Catalytic ConverterAudi A4 2004, Heavy Metal Catalytic Converter by MagnaFlow®. Converter Configuration: Direct Fit. Without Air Tube. Catalytic Inlet Diameter: 2.5". If your car needs replacement, install one that will get you through the smog check....$681.00 - $897.00
- MagnaFlow®OBDII Direct Fit Catalytic ConverterAudi A4 / A4 Quattro 1.8L Engine Family # 4ADXV01.8342 with LEV1 Standard / ULEV Standard 2004, OBDII Catalytic Converter by MagnaFlow®. Converter Configuration: Direct Fit. If your car needs replacement, install one that will get you...$1,035.00
- Walker®Ultra™ Direct Fit Round Body Catalytic ConverterAudi A4 1.8L 2004, Ultra™ Catalytic Converter by Walker®. Converter Configuration: Direct Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. With O2 Sensor Port. Catalytic Converter Overall Length: 15.375". Walker is an OE...$529.52
- MagnaFlow®OEM Grade Direct Fit Catalytic ConverterAudi A4 2004, OEM Grade Catalytic Converter by MagnaFlow®. Converter Configuration: Direct Fit. Without Air Tube. If your car needs replacement, install one that will get you through the smog check. This converter is part of the exhaust...$715.00 - $1,121.00
- CATCO®Direct Fit Catalytic ConverterAudi A4 / A4 Quattro 1.8L with California Emission / Federal Emission 2004, Catalytic Converter by CATCO®. Converter Configuration: Direct Fit. With 2 O2 Sensor Ports. Catalytic Converter Overall Length: 17". Designed and manufactured...$762.28
- CATCO®OBDII Universal Fit Round Body Catalytic ConverterAudi A4 / A4 Quattro 1.8L with California Emission / Federal Emission 2004, OBDII Catalytic Converter by CATCO®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. With 1 Passenger Side O2...$173.95
- HJS®Triangle Catalytic Converter GasketAudi A4 1.8L 2004, Triangle Catalytic Converter Gasket by HJS®. 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...High quality at an affordable priceExpertly made from premium materials$4.60 - $6.35
- TruParts®Exhaust System HangerAudi A4 with California Emission / with Federal Emission 2004, Exhaust System Hanger by TruParts®. Go with this high-quality product to restore your vehicle’s lost power and bring it back to its optimal condition. Made from the finest...Made utilizing the finest materials and equipmentEngineered to restore your vehicle to its pristine condition$11.33
- Davico®Universal Fit Catalytic ConverterAudi A4 / A4 Quattro 1.8L / 3.0L Gas 2004, Catalytic Converter by Davico®. Converter Configuration: Universal Fit. Position: Rear. Catalytic Inlet Diameter: 2". Catalytic Converter Overall Length: 15". This Universal fit catalytic...$122.58
- Walker®3-Bolt Catalytic Converter GasketAudi A4 1.8L 2004, 3-Bolt Catalytic Converter Gasket 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...Makes installation quick and easyOptimal OE-style fit and quality$6.99
- Audi OEExhaust System - Exhaust Components (1.8L)Audi A4 1.8L 2004, Exhaust System - Exhaust 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$25.33 - $1,563.80
- Audi OEExhaust System - Exhaust Components (1.8L)Audi A4 1.8L 2004, Exhaust System - Exhaust 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$25.33 - $1,563.80
- Audi OEExhaust System - Exhaust Components (3.0L)Audi A4 3.0L 2004, Exhaust System - Exhaust 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$17.22 - $1,946.01
- Audi OEExhaust System - Exhaust Components (3.0L)Audi A4 3.0L 2004, Exhaust System - Exhaust 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$17.22 - $3,501.17
- Audi OEExhaust System - Exhaust Components (B6 Body Code 1.8L)Audi A4 Quattro B6 Body Code 1.8L 2004, Exhaust System - Exhaust 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...Genuine OE replacement for your specific Audi modelDesigned to bring your vehicle back to its pristine condition$25.33 - $1,563.80
- Audi OEExhaust System - Exhaust Components (B6 Body Code 3.0L Gas)Audi A4 Quattro B6 Body Code 3.0L Gas 2004, Exhaust System - Exhaust 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...Genuine OE replacement for your specific Audi modelDesigned to bring your vehicle back to its pristine condition$17.22 - $3,501.17
- CATCO®Select Plus Tech Series OBDII Universal Fit Round Body Catalytic ConverterAudi A4 / A4 Quattro 1.8L with California Emission / Federal Emission 2004, Select Plus Tech Series OBDII Catalytic Converter by CATCO®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube....$519.60
- Walker®Ultra™ Universal Fit Round Body Catalytic ConverterAudi A4 1.8L 2004, Ultra™ Catalytic Converter by Walker®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. With 1 Inlet. Without Air Tube. Without O2 Sensor Port. Catalytic Converter Overall Length:...$157.56
- AP Exhaust®608 Series Universal Fit Round Body Catalytic ConverterAudi A4 / A4 Quattro 1.8L 2004, 608 Series Catalytic Converter by AP Exhaust®. Converter Configuration: Universal Fit. Catalytic Converter Body Shape: Round. Without Air Tube. With 1 Passenger Side O2 Sensor Port. Catalytic Inlet...$147.32
- Big End Performance®PCV Breather CapPCV Breather Cap by Big End Performance®. 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...$12.39 - $15.76
- Big End Performance®Clamp On PCV BreatherClamp On PCV Breather by Big End Performance®. This Big End Performance product is just the option for you in case you want to get the most out of your auto. It is made from first-rate materials to provide the highest level of quality....High quality at an affordable priceExpertly made from premium materials$16.27 - $18.98
- Granatelli Motor Sports®Valve Cover BreatherValve Cover Breather by Granatelli Motor Sports®. 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 mind. It will meet your...Made with precision and quality in mindDesigned to meet your specific needs$15.96
- Granatelli Motor Sports®Valve Cover Breather InsertValve Cover Breather Insert by Granatelli Motor Sports®. 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 mind. It will meet...Made with precision and quality in mindDesigned to meet your specific needs$50.69 - $67.83
- Dorman®OE Solutions™ Oxygen Sensor Bung Repair KitOE Solutions™ Oxygen Sensor Bung Repair Kit by Dorman®. Why replace an exhaust pipe because of a corroded, stripped or damaged oxygen sensor bung? Save the pipe and replace the bung with this weld-on replacement. Standard O2 sensor...Repair-friendly solution - this oxygen sensor bung allows replacement of a damaged fitting without replacing the entire exhaust componentUniversal fitment - designed to accommodate standard oxygen sensor threads$9.61 - $11.35
- iD Select®ECO II Universal Fit Catalytic ConverterUniversal ECO II Catalytic Converter by iD Select®. Converter Configuration: Universal Fit. Catalytic Converter Overall Length: 16". Swap out your worn-out or malfunctioning part with this top-notch exhaust product from iD Select....$144.22 - $146.77
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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2004 Audi A4 Models
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