How to remove and install the catalytic converter on Audi A4?

In four cylinder models, the starting point would be to remove the engine cover of 1.8L models and maybe remove the air filter housing to create ease of access. Disconnect the electrical connectors of the upstream and downstream oxygen sensors that might need to have the coolant expansion tank detached without the removal of the hoses. Take out the oxygen sensors of the catalytic converter and then remove the attaching parts that hold the front exhaust pipe in place on top of the catalytic converter. Lift the car on jackstands, loosen the bolts holding the front exhaust pipe support bracket, and then the three bolts holding the lower catalytic converter flange to the front exhaust pipe, and then take away the catalytic converter and dispose the old flange gaskets. The reverse order of installation should be adopted making sure that new gaskets and self-locking nuts are used. In case of V6 models, that one starts with the cover of the rear engine by taking it off then continue with the left-side catalytic converter by taking off the little cover, remove the engine coolant level sensor and the coolant expansion tank. Reach the oxygen sensor electrical connections, and in the case of right catalytic converter, do the same action, but remove the air filter housing. Take the top nuts holding the converter to the exhaust manifold, lift the vehicle, and take out the front wheel. Disconnect the exhaust system and, on AWD models, proceed to further steps to assist and support the transmission by lowering it. Lastly, unbolster the catalytic converter and replace it with the new one making sure that all the fasteners are tightened. In the case of 3.2L V6 engines, it includes the removal of the rear engine cover, the disconnection of the coolant level sensor on the left engine bank, and the same procedure on both the catalytic converters, making sure that the transmission is properly supported and that the entire assembly of the exhaust pipe is taken off carefully before attaching it.

Genuine Audi A4 Catalytic Converter

Cat. Converter

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48 Catalytic Converters found

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Audi A4 Catalytic Converter Part Number: 8E0-254-501-RX
$2333.59 MSRP: $2801.43
You Save: $467.84 (17%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS
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Audi A4 Catalytic Converter Part Number: 8E0-254-506-LX
$2450.21 MSRP: $2941.43
You Save: $491.22 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Catalytic Converter Part Number: 8E0-254-506-KX
$1754.06 MSRP: $2105.72
You Save: $351.66 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Catalytic Converter Part Number: 8E0-254-555-FX
$2053.63 MSRP: $2447.70
You Save: $394.07 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Catalytic Converter Part Number: 8E0-254-555-CX
$2148.71 MSRP: $2579.48
You Save: $430.77 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
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Audi A4 Catalytic Converter Part Number: 4M0-254-252-SX
$1906.36 MSRP: $2270.90
You Save: $364.54 (17%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Replaces: 4M0-254-252-FX, 4M0-254-252-HX, 4M0-254-252-CX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2017-2018 Audi A4 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Catalytic Converter Part Number: 8K0-254-252-KX
$2444.68 MSRP: $2917.15
You Save: $472.47 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2013-2016 Audi A4 | Base, Premium | 4 Cyl 2.0 L GAS
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Audi A4 Catalytic Converter Part Number: 8K0-254-202-CX
$2481.57 MSRP: $2961.44
You Save: $479.87 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Converter & Pipe, Preconverter
- Position: Left
- Replaces: 8K0-254-200-PX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016 Audi A4 | Premium | 4 Cyl 2.0 L GAS
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Audi A4 Catalytic Converter Part Number: 8K0-254-253-AX
$2481.57 MSRP: $2961.44
You Save: $479.87 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Converter & Pipe, Preconverter
- Position: Right
- Replaces: 8K0-254-250-PX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2016 Audi A4 | Premium | 4 Cyl 2.0 L GAS
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Audi A4 Catalytic Converter Part Number: 8W0-254-254
$1988.12 MSRP: $2386.70
You Save: $398.58 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter, Converter & Pipe
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2020 Audi A4 | Premium, Premium Plus, Prestige | 4 Cyl 2.0 L GAS
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Audi A4 Converter & Pipe Part Number: 8E0-254-503-TX
$2190.79 MSRP: $2630.00
You Save: $439.21 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8E0-254-551-KX
$2333.59 MSRP: $2801.43
You Save: $467.84 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS
View related parts
Audi A4 Converter & Pipe Part Number: 8E0-254-552-NX
$2333.59 MSRP: $2801.43
You Save: $467.84 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8E0-254-200-QX
$2739.91 MSRP: $3271.55
You Save: $531.64 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2005-2009 Audi A4 | Base, Cabriolet | 4 Cyl 2.0 L GAS
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Audi A4 Catalytic Converter Part Number: 8E0-254-506-JX
$2499.00 MSRP: $3000.00
You Save: $501.00 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Left
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8E0-254-555-DX
$2499.00 MSRP: $3000.00
You Save: $501.00 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Right
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2006-2008 Audi A4 | Base | 6 Cyl 3.2 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8E0-254-505-RX
$2597.16 MSRP: $3117.84
You Save: $520.68 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Converter & Pipe
- Position: Left
- Replaces: 8E0-254-502-TX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2004-2007 Audi A4 | Base | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8E0-254-505-SX
$2908.35 MSRP: $3491.41
You Save: $583.06 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Converter & Pipe
- Position: Left
- Replaces: 8E0-254-502-JX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2004-2007 Audi A4 | Base | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8E0-254-554-DX
$2537.08 MSRP: $3045.71
You Save: $508.63 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst; Catalytic Converter
- Position: Right
- Replaces: 8E0-254-552-CX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2002-2004 Audi A4 | Base, Cabriolet | 6 Cyl 3.0 L GAS
View related parts
Audi A4 Catalytic Converter Part Number: 8K0-254-253-HX
$2994.46 MSRP: $3577.15
You Save: $582.69 (17%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalyst
- Replaces: 8K0-254-250-FX
- Warranty: This genuine part is guaranteed by Audi's factory warranty.
Fits the following Vehicles:
- 2009-2012 Audi A4 | Base | 4 Cyl 2.0 L GAS

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1-20 of 48 Results

Audi A4 Catalytic Converter

The Audi A4 Catalytic Converter is the environmental shield of the car since it converts harmful exhaust gases into less harmful substances before passing out of the tailpipe. High temperatures in a sturdy steel shell cause the platinum group metals to create a reduction-oxidation reaction which converts carbon monoxide and unburned hydrocarbons into carbon dioxide and water. The redox process complies with federal emission regulations that were initiated in 1975, and it assists the Audi in reducing greenhouse gases and smog. The initial converters in the Audi model line employed beads composed of ceramic that retarded the flow of gases, and newer Audi models have a tightly woven honeycomb structure that provides the catalysts with additional surface area without clogging the engine. The two designs serve the same purpose but the honeycomb design is faster, lighter, and lowers the back pressure to accelerate the Audi car easily. The electrical starts, fuel economy, and slow throttle response, which are clear signs that the emission control path requires some attention, are experienced when the Catalytic Converter is clogged and drivers cannot help but notice slow starts. Despite its longevity, when the core gets exposed to leaded fuel or too much oil, it becomes fouled and may lower converter efficiency well before its metal shell becomes damaged. Since all Audis depend on an accurate air-to-fuel ratio, the overall engine performance is also assisted by maintaining a healthy Catalytic Converter. Through the generations, Audi A4 owners will be certain that the highly recent upgrade of the Catalytic Converter still adheres to the same basic physics, where the harmful fumes are transformed into much more harmless substances with each drive.

Choose original equipment manufacturer Catalytic Converter for great performance and strong durability. They use Audi's official craftsmanship and high-grade materials, and meet strict quality standards. Are you looking for quality Catalytic Converter at a good price? Come to our online store. We carry a wide range of genuine parts for your Audi A4 and the prices are competitive. Each part comes with the manufacturer's warranty. You can install with confidence and get steady results. Over time, you'll save money and avoid hassle. Keep your maintenance simple and protect your vehicle with OEM parts. Get the quality your A4 needs now.

Audi A4 Catalytic Converter Parts and Q&A

Catalytic Converter
8E0-131-089-DX
Q: How to remove and install the catalytic converter on Audi A4?
A:
In four cylinder models, the starting point would be to remove the engine cover of 1.8L models and maybe remove the air filter housing to create ease of access. Disconnect the electrical connectors of the upstream and downstream Oxygen Sensors that might need to have the coolant expansion tank detached without the removal of the hoses. Take out the oxygen sensors of the catalytic converter and then remove the attaching parts that hold the front exhaust pipe in place on top of the catalytic converter. Lift the car on jackstands, loosen the bolts holding the front exhaust pipe support bracket, and then the three bolts holding the lower catalytic converter flange to the front exhaust pipe, and then take away the catalytic converter and dispose the old flange gaskets. The reverse order of installation should be adopted making sure that new gaskets and self-locking nuts are used. In case of V6 models, that one starts with the cover of the rear engine by taking it off then continue with the left-side catalytic converter by taking off the little cover, remove the engine coolant level sensor and the coolant expansion tank. Reach the oxygen sensor electrical connections, and in the case of right catalytic converter, do the same action, but remove the air filter housing. Take the top nuts holding the converter to the exhaust manifold, lift the vehicle, and take out the front wheel. Disconnect the exhaust system and, on AWD models, proceed to further steps to assist and support the transmission by lowering it. Lastly, unbolster the catalytic converter and replace it with the new one making sure that all the fasteners are tightened. In the case of 3.2L V6 engines, it includes the removal of the rear engine cover, the disconnection of the coolant level sensor on the left engine bank, and the same procedure on both the catalytic converters, making sure that the transmission is properly supported and that the entire assembly of the exhaust pipe is taken off carefully before attaching it.