How to replace the catalytic converter on a 4.3L engine on GMC Sierra 1500?

A 4.3l engine requires three steps before replacing the Catalytic Converter including raising and supporting the vehicle followed by skid plate and transmission crossmember removal. The right front connector position assurance (CPA) retainer needs removal before disconnecting the right front heated Oxygen Sensor (HO2S) electrical connector from the engine wiring harness. Initial steps require disconnecting the right rear cpb retainer then removing the engine wiring harness electrical connector from right rear ho2s electrical connector before extracting the right rear ho2s clip from the engine harness clip. Continue this procedure for the left rear and left front ho2s connectors by removing both cpa retainers and their associated clips. First disconnect all required sensors before you remove the nuts from the Catalytic Converter to Muffler interface and the Catalytic Converter to Exhaust Manifold interface. Finally, separate the Catalytic Converter assembly from the exhaust manifolds and Muffler. When you plan to replace the entire Catalytic Converter assembly make sure to remove the exhaust seals along with sensors from the assembly. Before you install the ho2s to the Catalytic Converter assembly, treat the ho2s threads with anti-seize compound gm p/n 12377953 then tighten everything to 42 n.m (31 lb ft). A new exhaust seal installation may be necessary before you fasten the Catalytic Converter assembly to Muffler and exhaust manifolds by torquing nuts to 50 n.m (37 lb ft) and 45 n.m (33 lb ft). When installing the left front ho2s on 4wd vehicles connect the engine wiring harness electrical connector to the operating sensor then install the retainer clamp before fastening the ho2s connector. The right side sensor connection process continues while the transmission crossmember is installed with the oil pan skid plate positioned correctly before tightening its bolts to 28 n.m (21 lb ft). Once completed, lower the vehicle.

OEM GMC Sierra 1500 Catalytic Converter

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38 Catalytic Converters found

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GMC Sierra 1500 Catalytic Converter
Part Number: 22940415
$1896.42 MSRP: $2834.87
You Save: $938.45 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15905949
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 8 Cyl 4.8 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.2 L FLEX
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GMC Sierra 1500 Catalytic Converter
Part Number: 19418958
$1497.91 MSRP: $2236.50
You Save: $738.59 (34%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 20854457, 25904626, 25904629
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2010 GMC Sierra 1500 | Denali, SLE, SLT | 8 Cyl 6.2 L FLEX, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19418955
$1402.23 MSRP: $2092.83
You Save: $690.60 (33%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 25904630
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2008 GMC Sierra 1500 | WT | 6 Cyl 4.3 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19418939
$2035.73 MSRP: $3152.45
You Save: $1116.72 (36%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15127418, 25904628, 25824120
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2008 GMC Sierra 1500 | Denali, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19418926
$2089.59 MSRP: $3134.37
You Save: $1044.78 (34%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15896590, 20854453
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX
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GMC Sierra 1500 Three-Way Catalytic Converter with Exhaust Pipe
Part Number: 19420288
$1990.02 MSRP: $2975.40
You Save: $985.38 (34%)
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Product Specifications
- Other Name: CONVERTER ASM,3WAY CTLTC(W/EXH PIPE); Converter & Pipe; Converter, Catalytic Converter
- Replaces: 23486656
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2016-2019 GMC Sierra 1500 | AT4, Base, Denali, Elevation, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19418932
$2642.34 MSRP: $3954.87
You Save: $1312.53 (34%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 25824121
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2010 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19420265
$1983.37 MSRP: $2965.42
You Save: $982.05 (34%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe); Converter & Pipe; Converter, Catalytic Converter; Exhaust Pipe
- Replaces: 23111625, 84362281
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2015-2018 GMC Sierra 1500 | Denali, SLT | 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19420276
$2050.74 MSRP: $3066.58
You Save: $1015.84 (34%)
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Product Specifications
- Other Name: Converter Assembly, Warm Up 3Way Catalytic (W/ Exhaust Pipe); Converter & Pipe; Converter, Catalytic Converter
- Replaces: 20757674
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2018 GMC Sierra 1500 | Base, Denali, SLE, SLT | 6 Cyl 4.3 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19420291
$2103.29 MSRP: $3145.48
You Save: $1042.19 (34%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe); Converter & Pipe; Converter, Catalytic Converter
- Replaces: 23492619, 84362282
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2016-2018 GMC Sierra 1500 | Base, Denali, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19420284
$2223.07 MSRP: $3325.33
You Save: $1102.26 (34%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe); Converter & Pipe; Converter, Catalytic Converter; Exhaust Pipe
- Replaces: 22948166
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2018 GMC Sierra 1500 | Denali, SLT | 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19418941
$2245.46 MSRP: $3358.95
You Save: $1113.49 (34%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15905948, 20854454
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2009-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L FLEX, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.0 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L FLEX
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GMC Sierra 1500 Catalytic Converter
Part Number: 85542369
$1913.78 MSRP: $2860.93
You Save: $947.15 (34%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter, Catalytic Converter; Converter & Pipe
- Replaces: 84557807, 84655076
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2022 GMC Sierra 1500 | AT4, Base, Denali, Elevation, Pro, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19420109
$933.52 MSRP: $1389.07
You Save: $455.55 (33%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Front Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 10395214, 15755464, 15754087
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007, 2003 GMC Sierra 1500 | Denali, SLE, SLT | 8 Cyl 6.0 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 85542368
$1221.58 MSRP: $1979.40
You Save: $757.82 (39%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Converter, Catalytic Converter; Converter & Pipe
- Replaced by: 86781749
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2023 GMC Sierra 1500 | AT4, Base, Denali, Elevation, Pro, SLE, SLT | 6 Cyl 4.3 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 23462199
$1572.79 MSRP: $2348.93
You Save: $776.14 (34%)
ADD TO CART
Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Converter & Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2016-2018 GMC Sierra 1500 | Base, Denali, SLE, SLT | 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 5.3 L MILD HYBRID EV-GAS (MHEV), 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 12693374
$732.19 MSRP: $1086.77
You Save: $354.58 (33%)
ADD TO CART
Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Converter & Pipe
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2023 GMC Sierra 1500 | Base, Elevation, Pro, SLE | 4 Cyl 2.7 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 40009139
$924.15 MSRP: $1375.00
You Save: $450.85 (33%)
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Product Specifications
- Other Name: Converter Assembly-Nitrogen Oxide Catalytic (W/Filter); Diesel Particulate Filter; Converter, Catalytic Converter
- Replaces: 12696443, 12709334, 12700216, 12698485, 12694479, 40009042
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2020-2023 GMC Sierra 1500 | AT4, AT4X, Denali, Denali Ultimate, Elevation, Pro, SLE, SLT | 4 Cyl 2.7 L GAS, 6 Cyl 3.0 L DIESEL, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L GAS, 8 Cyl 6.2 L GAS
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GMC Sierra 1500 Catalytic Converter
Part Number: 19420098
$1829.91 MSRP: $2735.00
You Save: $905.09 (34%)
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15782486, 19208464
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 GMC Sierra 1500 | Hybrid, SL, SLE, SLT, WT | 6 Cyl 4.3 L GAS, 8 Cyl 4.8 L GAS, 8 Cyl 5.3 L FLEX, 8 Cyl 5.3 L FULL HYBRID EV-GAS (FHEV), 8 Cyl 5.3 L GAS
View related parts
GMC Sierra 1500 Catalytic Converter
Part Number: 19419599
$1942.11 MSRP: $2903.47
You Save: $961.36 (34%)
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Manifold Pipe) "Kit"; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 15896591
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2013 GMC Sierra 1500 | Denali, Hybrid, SL, SLE, SLT, WT, XFE | 8 Cyl 4.8 L FLEX, 8 Cyl 5.3 L FLEX, 8 Cyl 6.0 L FULL HYBRID EV-FLEX (FHEV), 8 Cyl 6.2 L FLEX

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GMC Sierra 1500 Catalytic Converter

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GMC Sierra 1500 Catalytic Converter Parts Questions & Experts Answers

Catalytic Converter
19420109
Q: How to replace the catalytic converter on a 4.3L engine on GMC Sierra 1500?
A: A 4.3l engine requires three steps before replacing the Catalytic Converter including raising and supporting the vehicle followed by skid plate and transmission crossmember removal. The right front connector position assurance (CPA) retainer needs removal before disconnecting the right front heated Oxygen Sensor (HO2S) electrical connector from the engine wiring harness. Initial steps require disconnecting the right rear cpb retainer then removing the engine wiring harness electrical connector from right rear ho2s electrical connector before extracting the right rear ho2s clip from the engine harness clip. Continue this procedure for the left rear and left front ho2s connectors by removing both cpa retainers and their associated clips. First disconnect all required sensors before you remove the nuts from the Catalytic Converter to Muffler interface and the Catalytic Converter to Exhaust Manifold interface. Finally, separate the Catalytic Converter assembly from the exhaust manifolds and Muffler. When you plan to replace the entire Catalytic Converter assembly make sure to remove the exhaust seals along with sensors from the assembly. Before you install the ho2s to the Catalytic Converter assembly, treat the ho2s threads with anti-seize compound gm p/n 12377953 then tighten everything to 42 n.m (31 lb ft). A new exhaust seal installation may be necessary before you fasten the Catalytic Converter assembly to Muffler and exhaust manifolds by torquing nuts to 50 n.m (37 lb ft) and 45 n.m (33 lb ft). When installing the left front ho2s on 4wd vehicles connect the engine wiring harness electrical connector to the operating sensor then install the retainer clamp before fastening the ho2s connector. The right side sensor connection process continues while the transmission crossmember is installed with the oil pan skid plate positioned correctly before tightening its bolts to 28 n.m (21 lb ft). Once completed, lower the vehicle.