How to diagnose and replace a malfunctioning catalytic converter?

A catalytic converter is a type of emission control device in an exhaust system which brings down some pollutants within the exhaust gas stream. Two kinds of converters exist; oxidation catalyst and reduction catalyst. Take it to a dealer or authorized emission inspection facility for diagnosis and repair if you suspect that the converter on your vehicle is not functioning properly. Inspect the converter for leaks, corrosion, dents, and other damage when servicing underbody components. Replace the converter if any damage is found. Place a vacuum gauge on an intake manifold vacuum source and note the vacuum reading at idle and when the throttle is quickly opened and closed in order to test for a restricted converter. When compared to idle reading, if the fourth reading is over one in-Hg lower than this, it may be indicative of restricted exhaust systems. After raising the vehicle disconnect the downstream oxygen sensor, nuts securing upper and rear flanges of catalyst/exhaust pipe assembly are removed, old flange gaskets are discarded together with that assembly new gasket and fasteners are used to install items.

Genuine Chevrolet Impala Catalytic Converter

Cat. Converter

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44 Catalytic Converters found

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Chevrolet Impala 3Way Catalytic Convertor Assembly (W/Exhaust Pipe)
Part Number: 84216836
$609.45 MSRP: $906.57
You Save: $297.12 (33%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic(W/Exhaust Pipe); Catalytic Converter, Preconverter
- Replaced by: 19420239
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2016-2020 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK | 6 Cyl 3.6L
View related parts
Chevrolet Impala 3-Way Catalytic Convertor (W/ Exhaust Rear Manifold Pipe)
Part Number: 22794842
$1271.42 MSRP: $1905.00
You Save: $633.58 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Asm 3Way Catalytic (W/ Exhaust Rear Mani ; Converter, Catalytic Converter
- Position: Rear
- Replaced by: 19418940
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK | 4 Cyl 2.4L
View related parts
Chevrolet Impala 3-Way Catalytic Convertor (W/ Exhaust Rear Manifold Pipe)
Part Number: 22839596
$1115.68 MSRP: $2393.40
You Save: $1277.72 (54%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Asm 3Way Catalytic (W/ Exhaust Rear Mani ; Converter, Catalytic Converter; Catalytic Converter, Converter & Pipe
- Position: Rear
- Replaced by: 19420250
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2012-2016 Chevrolet Impala | LS, LTZ | 6 Cyl 3.6L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Front Man
Part Number: 20926629
$999.59 MSRP: $1495.00
You Save: $495.41 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Front Man; Catalytic Converter, Preconverter
- Position: Front
- Replaced by: 19418922
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2015 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK | 6 Cyl 3.6L
View related parts
Chevrolet Impala 3-Way Catalytic Convertor (W/ Exhaust Rear Manifold Pipe)
Part Number: 20926628
$811.31 MSRP: $1525.00
You Save: $713.69 (47%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Asm 3Way Catalytic (W/ Exhaust Rear Mani; Catalytic Converter, Preconverter
- Position: Rear
- Replaced by: 19420114
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2015 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK | 6 Cyl 3.6L
View related parts
Chevrolet Impala CONVERTER ASM,3WAY CTLTC(W/EXH RR MANIF PIPE) "KIT"
Part Number: 19420100
$1957.70 MSRP: $2940.11
You Save: $982.41 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Position: Rear
- Replaces: 22794847, 21000000
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK | 4 Cyl 2.4L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly
Part Number: 22740667
$921.11 MSRP: $1638.15
You Save: $717.04 (44%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic ; Converter, Catalytic Converter; Catalytic Converter, Intermed Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2012-2013 Chevrolet Impala | LS, LTZ | 6 Cyl 3.6L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Front Man
Part Number: 20831819
$726.09 MSRP: $1572.86
You Save: $846.77 (54%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Front Man; Catalytic Converter, Converter & Pipe
- Position: Front
- Replaced by: 19420258
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2012-2016 Chevrolet Impala | LS, LTZ | 6 Cyl 3.6L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25950919
$1615.64 MSRP: $2424.20
You Save: $808.56 (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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2011 Chevrolet Impala | LS, LT, LTZ | 6 Cyl 3.5L Flex
View related parts
Chevrolet Impala 3-Way Catalytic Convertor (W/ Exhaust Rear Manifold Pipe)
Part Number: 22839597
$1215.39 MSRP: $2227.37
You Save: $1011.98 (46%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Asm 3Way Catalytic (W/ Exhaust Rear Mani ; Converter, Catalytic Converter; Catalytic Converter, Converter & Pipe
- Position: Rear
- Replaces: 20831817
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2012-2013 Chevrolet Impala | LS, LTZ | 6 Cyl 3.6L
View related parts
Chevrolet Impala Exhaust Crossover Pipe Assembly (W/Heat Shield)
Part Number: 24503125
$435.55 MSRP: $654.11
You Save: $218.56 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Pipe Assembly, Exhaust Crossover (W/Heat Shield) ; Pipe, Exhaust Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2000-2005 Chevrolet Impala | IMPALA, LS, LT, LUMINA, POLICE CAR, SS | 6 Cyl 3.8L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25820195
$1604.48 MSRP: $2407.37
You Save: $802.89 (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
- Replaces: 15780299
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2009 Chevrolet Impala | LS, LS POLICE CAR, LT, LT 3.5, LTZ, SS | 6 Cyl 3.5L, 6 Cyl 3.5L Flex, 6 Cyl 3.9L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25820197
$1734.28 MSRP: $2603.13
You Save: $868.85 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Converter & Pipe
- Replaces: 15912308
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2009 Chevrolet Impala | LS, LS POLICE CAR, LT, LT 3.5, LTZ, SS | 6 Cyl 3.9L, 6 Cyl 3.9L Flex
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25820196
$1786.89 MSRP: $2682.49
You Save: $895.60 (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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2010 Chevrolet Impala | LS, LT, LT 3.5, LTZ, SS | 6 Cyl 3.5L, 6 Cyl 3.5L Flex
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 15909238
$1836.67 MSRP: $2757.56
You Save: $920.89 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P; Converter & Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2008 Chevrolet Impala | LS, LS POLICE CAR, LT, LT 3.5, LTZ, SS | 6 Cyl 3.5L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25882589
$1855.14 MSRP: $2785.44
You Save: $930.30 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Manifold P
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009 Chevrolet Impala | LS, LT, LT 3.5, LTZ, SS | 6 Cyl 3.9L Flex
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Front Man
Part Number: 20831820
$1353.47 MSRP: $2028.77
You Save: $675.30 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/ Exhaust Front Man; Catalytic Converter, Converter & Pipe
- Position: Front
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2012-2013 Chevrolet Impala | LS, LTZ | 6 Cyl 3.6L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
Part Number: 25950920
$1676.71 MSRP: $2516.31
You Save: $839.60 (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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2011 Chevrolet Impala | LS, LT, LTZ | 6 Cyl 3.9L Flex
View related parts
Chevrolet Impala Warm Up 3Way Catalytic Convertor
Part Number: 12627204
$1117.79 MSRP: $1673.29
You Save: $555.50 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter,Warm Up 3Way Catalytic; Catalytic Converter
- Replaced by: 19420234
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2019 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK | 4 Cyl 2.5L
View related parts
Chevrolet Impala 3Way Catalytic Convertor Assembly (W/Exhaust Pipe)
Part Number: 84647489
$1331.09 MSRP: $1995.00
You Save: $663.91 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Ctltc(W/Exh Pipe); Catalytic Converter, Preconverter
- Replaced by: 19420240
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2020 Chevrolet Impala | LS 4 DOOR NOTCHBACK, LT 4 DOOR NOTCHBACK, LTZ 4 DOOR NOTCHBACK | 6 Cyl 3.6L

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1-20 of 44 Results

Chevrolet Impala Catalytic Converter Parts Questions & Experts Answers

3Way Catalytic Convertor Assembly (W/ Exhaust Manifold P
25820196
Q: How to diagnose and replace a malfunctioning catalytic converter?
A: A catalytic converter is a type of emission control device in an exhaust system which brings down some pollutants within the exhaust gas stream. Two kinds of converters exist; oxidation catalyst and reduction catalyst. Take it to a dealer or authorized emission inspection facility for diagnosis and repair if you suspect that the converter on your vehicle is not functioning properly. Inspect the converter for leaks, corrosion, dents, and other damage when servicing underbody components. Replace the converter if any damage is found. Place a vacuum gauge on an intake manifold vacuum source and note the vacuum reading at idle and when the throttle is quickly opened and closed in order to test for a restricted converter. When compared to idle reading, if the fourth reading is over one in-Hg lower than this, it may be indicative of restricted exhaust systems. After raising the vehicle disconnect the downstream Oxygen Sensor, nuts securing upper and rear flanges of catalyst/exhaust pipe assembly are removed, old flange gaskets are discarded together with that assembly new gasket and fasteners are used to install items.