What is a catalytic converter and how do you diagnose and repair it?

A catalytic converter is an emission control device that reduces certain pollutants. There are two types of converters: an oxidation catalyst that reduces hydrocarbons and carbon monoxide, and a reduction catalyst that reduces oxides of nitrogen. Vehicles are equipped with two three-way catalysts that can reduce all three pollutants. Whenever you raise the vehicle to service underbody components, inspect the converter for leaks, corrosion, dents, and other damage. The easiest way to check for a restricted converter is to use a vacuum gauge to diagnose the effect of a blocked exhaust on the intake vacuum. To remove the converter, raise the vehicle and place it securely on jack stands, disconnect the electrical connectors for the upstream and downstream oxygen sensors, remove all four sensors, remove the nuts at each of the upper flanges that secure the front exhaust pipe assembly to the exhaust manifold flanges, remove the nuts that secure the rear flange of the front exhaust pipe assembly to the rest of the exhaust system, and remove the front exhaust pipe assembly. To install the converter, coat the threads of the nuts and bolts with an anti-seize compound to facilitate future removal and tighten the nuts that secure the front exhaust pipe assembly to the exhaust manifold and to the rest of the exhaust system securely.

Genuine Chevrolet Avalanche Catalytic Converter

Cat. Converter

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16 Catalytic Converters found

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Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25904628
$1530.31 MSRP: $2996.63
You Save: $1466.32 (49%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Catalytic Converter, Converter & Pipe
- Replaced by: 19418939
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2008 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
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Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 20854453
$1724.85 MSRP: $2690.39
You Save: $965.54 (36%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Catalytic Converter, Converter & Pipe
- Replaced by: 19418926
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
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Chevrolet Avalanche CONVERTER ASM,3WAY CTLTC (W/EXH MANIF PIPE)"KIT"
Part Number: 19418932
$2255.33 MSRP: $3389.03
You Save: $1133.70 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalytic Converter, Converter & Pipe
- Replaces: 25824121
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2008 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
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Chevrolet Avalanche CONVERTER ASM,3WAY CTLTC (W/EXH MANIF PIPE)"KIT"
Part Number: 19418941
$2125.30 MSRP: $3192.92
You Save: $1067.62 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Catalytic Converter, Converter & Pipe
- Replaces: 20854454, 15905948
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
View related parts
Chevrolet Avalanche 3-Way Catalytic Convertor Assembly (W/ Exhaust Manifold Pipe)
Part Number: 19208464
$992.35 MSRP: $1484.08
You Save: $491.73 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Asm,3Way Catalytic (W/ Exhaust Manifold Pipe); Catalytic Converter, Converter & Pipe
- Replaced by: 19420098
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex
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Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 10395213
$946.55 MSRP: $1415.00
You Save: $468.45 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Catalytic Converter, Converter & Pipe, Front Pipe
- Replaced by: 19420124
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005 Chevrolet Avalanche | 1/2 TON
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 10395214
$1230.70 MSRP: $1843.58
You Save: $612.88 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Catalytic Converter, Converter & Pipe, Front Pipe
- Replaced by: 19420109
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005 Chevrolet Avalanche | 1/2 TON
View related parts
Chevrolet Avalanche CONVERTER ASM,3WAY CTLTC (W/EXH MANIF PIPE)"KIT"
Part Number: 19418955
$2049.82 MSRP: $3218.12
You Save: $1168.30 (37%)
ADD TO CART
Product Specifications
- Other Name: Catalytic Converter, Converter & Pipe
- Replaces: 25904630
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
View related parts
Chevrolet Avalanche CONVERTER ASM,3WAY CTLTC (W/EXH MANIF PIPE)"KIT"
Part Number: 19418928
$1738.93 MSRP: $2610.14
You Save: $871.21 (34%)
Product Specifications
- Other Name: Catalytic Converter, Converter & Pipe
- Replaces: 15246489, 15052911, 15076459, 15756279, 10395212, 19206638, 15082124, 15076458, 15036169, 15756278
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2006 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L, 8 Cyl 5.3L Flex
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P*Marked Print *Marked Print
Part Number: 15070466
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P*Marked Print; Catalytic Converter
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 15199818
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P
- Replaces: 15077754
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 15793201
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Front Pipe
- Replaces: 15135147
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 15793200
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Front Pipe
- Replaces: 15135148
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 15077752
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Catalytic Converter, Converter & Pipe, Front Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2005 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 15077751
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Catalytic Converter, Converter & Pipe, Front Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2005 Chevrolet Avalanche | 3/4 TON | 8 Cyl 8.1L
View related parts
Chevrolet Avalanche 3Way Catalytic Convertor (W/Exhaust Manifold Pipe)
Part Number: 15079086
Product Specifications
- Other Name: Converter,3Way Catalytic(W/Exhaust Manifold Pipe); Catalytic Converter, Converter & Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002 Chevrolet Avalanche | 1/2 TON | 8 Cyl 5.3L

Chevrolet Avalanche Catalytic Converter Parts Questions & Experts Answers

3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
20854453
Q: What is a catalytic converter and how do you diagnose and repair it?
A: A catalytic converter is an emission control device that reduces certain pollutants. There are two types of converters: an oxidation catalyst that reduces hydrocarbons and carbon monoxide, and a reduction catalyst that reduces oxides of nitrogen. Vehicles are equipped with two three-way catalysts that can reduce all three pollutants. Whenever you raise the vehicle to service underbody components, inspect the converter for leaks, corrosion, dents, and other damage. The easiest way to check for a restricted converter is to use a vacuum gauge to diagnose the effect of a blocked exhaust on the intake vacuum. To remove the converter, raise the vehicle and place it securely on jack stands, disconnect the electrical connectors for the upstream and downstream Oxygen Sensors, remove all four sensors, remove the nuts at each of the upper flanges that secure the front exhaust pipe assembly to the exhaust manifold flanges, remove the nuts that secure the rear flange of the front exhaust pipe assembly to the rest of the exhaust system, and remove the front exhaust pipe assembly. To install the converter, coat the threads of the nuts and bolts with an anti-seize compound to facilitate future removal and tighten the nuts that secure the front exhaust pipe assembly to the exhaust manifold and to the rest of the exhaust system securely.

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