How to service the catalytic converter, including the replacement of the muffler and tailpipe on Buick LeSabre?

The Catalytic Converter necessitates the need for changing the Muffler and tailpipe as a whole unit. The process should be started with the Oxygen Sensor (H02S1) removal. Support the converter, then remove the front pipe to Catalytic Converter nuts, next the intermediate pipe hangers at body mounts with the others (rear hanger) at tailpipe to chassis mount. Then, the exhaust system should be removed from the vehicle. In case of installation, support the exhaust system at the converter and align it to the under body of the vehicle. Install the converter to the front pipe flange and tighten the nuts on the converter studs. Attach the center Exhaust Hanger to the underbody and the rear Exhaust Hanger to the rear compartment rail. The front pipe to converter nuts then are to be tightened to 25 nm (18 ft. Lbs.), and finally the Oxygen Sensor h02s1plug in.

How to replace the catalytic converter heat shield on Buick Park Avenue?

Begin heat shield repair by removing the exhaust system and protecting eyes before drilling rivets. Drilling through the rivets at the heat shield's center allows you to disengage it from the retaining stud by pulling downward until you can slide it to the left and remove it from beneath the oxygen sensor wiring harness heat shield. Operation begins with heat shield placement to the right side under oxygen sensor wiring harness shield before pushing upward onto the retaining stud until holes on shield match floor panel holes. Install both the oxygen sensor wiring harness heat shield and Catalytic Converter heat shield directly to the floor panel one at a time by using a rivet gun for their single rivet then keep installing other rivets before reinstalling the exhaust system.

How to replace the oxidation catalytic converter on Buick Lucerne?

Begin by raising and supporting the vehicle before starting Catalytic Converter replacement work. The cut point should be marked on the converter outlet pipe at 36 mm (1.4 in) distance behind the oxidation Catalytic Converter weld. Use wrenches to cut through the converter outlet pipe at your specified mark and disconnect the oxidation Catalytic Converter to Muffler assembly nuts. You must pull the Muffler assembly backward to free up space before removing the oxidation Catalytic Converter from the vehicle while discarding the gasket. When installing the system users should slide the 2 service clamps onto the oxidation Catalytic Converter outlet pipe but should avoid tightening the clamp. A fresh gasket must be placed between the two catalytic converters and the exhaust system may need minor adjustment for proper fitting between the Catalytic Converter and Muffler assembly. After installing the oxidation converter between the Muffler and three-way converter, torque its nuts to 47 nm (35 lb ft). Position the clamps along the Catalytic Converter output pipe's middle section with opposite facing directions and keep them as close together as possible. Check the alignment of the oxidation Catalytic Converter with the Muffler assembly while tightening the clamps to 54 nm (40 lb ft). Drop the vehicle to the ground then conduct an exhaust leak inspection.

OEM Buick Catalytic Converter

Cat. Converter

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169 Catalytic Converters found

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Buick Catalytic Converter
Part Number: 19332467
$1033.00 MSRP: $1547.90
You Save: $514.90 (34%)
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Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Converter & Pipe; Converter, Exhaust Pipe
- Replaces: 15861402
Fits the following Buick Models:
- LaCrosse | 2007-2009 | CX, CXL | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter
Part Number: 20894010
$1193.60 MSRP: $1779.58
You Save: $585.98 (33%)
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Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Manifold; Preconverter
- Position: Front
Fits the following Buick Models:
- LaCrosse | 2013-2016 | Base, Leather, Premium, Sport Touring, Touring | 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS
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Buick Catalytic Converter
Part Number: 22975354
$563.70 MSRP: $833.78
You Save: $270.08 (33%)
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Product Specifications
- Other Name: Converter, Catalytic Converter; Preconverter
Fits the following Buick Models:
- LaCrosse | 2017-2018 | Avenir, Base, Essence, Preferred, Premium | 6 Cyl 3.6 L GAS
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Buick Converter & Pipe, Rear
Part Number: 19418933
$999.97 MSRP: $1488.85
You Save: $488.88 (33%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Rear Manifold Pipe) "Kit"; Converter, Catalytic Converter
- Position: Rear
- Replaces: 20893999, 20907414, 20805599
Fits the following Buick Models:
- LaCrosse | 2010 | CX, CXL | 6 Cyl 3.0 L GAS
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Buick Catalytic Converter
Part Number: 25204733
$1029.68 MSRP: $1546.07
You Save: $516.39 (34%)
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Encore GX | 2024 | Avenir, Preferred, Sport Touring | 3 Cyl 1.3 L GAS
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Buick Catalytic Converter
Part Number: 25204734
$1038.48 MSRP: $1559.28
You Save: $520.80 (34%)
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Encore GX | 2024 | Avenir, Preferred, Sport Touring | 3 Cyl 1.3 L GAS
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Buick Catalytic Converter
Part Number: 25196720
$941.16 MSRP: $1410.00
You Save: $468.84 (34%)
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Product Specifications
- Other Name: Converter, Catalytic Converter; Exhaust Pipe; Converter & Pipe
Fits the following Buick Models:
- Encore | 2019-2021 | Base, Essence, Preferred, Sport Touring | 4 Cyl 1.4 L GAS
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Buick Catalytic Converter
Part Number: 25202307
$4497.42 MSRP: $6740.27
You Save: $2242.85 (34%)
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Encore | 2021-2022 | Base, Preferred | 4 Cyl 1.4 L GAS
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Buick Cross Over
Part Number: 24503125
$437.51 MSRP: $654.11
You Save: $216.60 (34%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Pipe, Exhaust Pipe; Crossover Pipe; Front Pipe; Cross Over Pipe; Exhaust Pipe
Fits the following Buick Models:
- LaCrosse | 2005-2009 | CX, CXL | 6 Cyl 3.8 L GAS
- LeSabre | 1995-2005 | Custom, Limited | 6 Cyl 3.8 L GAS
- Lucerne | 2006-2008 | CX, CXL | 6 Cyl 3.8 L GAS
- Park Avenue | 1995-2005 | Base, Ultra | 6 Cyl 3.8 L GAS
- Regal | 1996-2004 | 25th Anniversary Edition, Custom, Gran Sport, GS, GSE, Limited, LS, LSE, Olympic Gold Edition | 6 Cyl 3.8 L GAS
- Riviera | 1995-1999 | Base | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter
Part Number: 15861399
$1892.60 MSRP: $2838.58
You Save: $945.98 (34%)
ADD TO CART
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
Fits the following Buick Models:
- LaCrosse | 2005-2009 | CX, CXL | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter
Part Number: 15777196
$2216.46 MSRP: $3315.40
You Save: $1098.94 (34%)
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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
Fits the following Buick Models:
- LaCrosse | 2008-2009 | Super | 8 Cyl 5.3 L GAS
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Buick Converter
Part Number: 25056910
$644.74 MSRP: $955.47
You Save: $310.73 (33%)
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Product Specifications
- Other Name: Converter, Catalytic Converter; Catalytic Converter
Fits the following Buick Models:
- Century | 1985 | Custom, Estate Wagon, Limited, T-Type | 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS, 6 Cyl 4.3 L DIESEL
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Buick Catalytic Converter, Rear
Part Number: 19418940
$1343.11 MSRP: $2004.07
You Save: $660.96 (33%)
ADD TO CART
Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Rear Manifold Pipe) "Kit"; Converter & Pipe; Converter; Preconverter; Converter, Catalytic Converter
- Position: Rear
- Replaces: 22794842, 25886008, 20931546
Fits the following Buick Models:
- LaCrosse | 2010-2016 | Base, Convenience, CX, CXL, Leather, Premium | 4 Cyl 2.4 L GAS, 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV)
- Regal | 2011-2015 | Base, CXL, Premium | 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS, 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV)
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Buick Catalytic Converter, Driver Side
Part Number: 19418923
$1209.99 MSRP: $1804.18
You Save: $594.19 (33%)
Ships in 1-3 Business Days
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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
- Position: Driver Side
- Replaces: 15903507
Fits the following Buick Models:
- Enclave | 2009-2011 | CX, CXL | 6 Cyl 3.6 L GAS
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Buick Catalytic Converter
Part Number: 24508098
Product Specifications
- Other Name: Converter; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
Fits the following Buick Models:
- Regal | 1997-2000 | GS, LS, LSE | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter
Part Number: 25128983
Product Specifications
- Other Name: Converter, Catalytic Converter; Converter
Fits the following Buick Models:
- Regal | 1990-1992 | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter
Part Number: 24504243
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Converter; Converter, Catalytic Converter; Converter, Exhaust Pipe
Fits the following Buick Models:
- Regal | 1994-1995 | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter
Part Number: 24504613
Product Specifications
- Other Name: Converter; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
Fits the following Buick Models:
- Regal | 1994-1996 | Custom | 6 Cyl 3.1 L GAS
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Buick Catalytic Converter
Part Number: 10343187
$936.26 MSRP: $1402.65
You Save: $466.39 (34%)
Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe; Converter & Pipe; Converter, Catalytic Converter; Converter, Exhaust Pipe
- Replaces: 10337610, 12564328
Fits the following Buick Models:
- Regal | 2001-2003 | LS | 6 Cyl 3.8 L GAS
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Buick Exhaust Manifold
Part Number: 22737796
$1004.96 MSRP: $1496.33
You Save: $491.37 (33%)
Product Specifications
- Other Name: Converter, Catalytic Converter; Preconverter; Catalytic Converter
- Position: Rear
Fits the following Buick Models:
- LaCrosse | 2014-2016 | Base, Leather, Premium, Sport Touring | 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS

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1-20 of 169 Results

Buick Catalytic Converter Parts Questions & Experts Answers

Cross Over
24503125
Q: How to service the catalytic converter, including the replacement of the muffler and tailpipe on Buick LeSabre?
A: The Catalytic Converter necessitates the need for changing the Muffler and tailpipe as a whole unit. The process should be started with the Oxygen Sensor (H02S1) removal. Support the converter, then remove the front pipe to Catalytic Converter nuts, next the intermediate pipe hangers at body mounts with the others (rear hanger) at tailpipe to chassis mount. Then, the exhaust system should be removed from the vehicle. In case of installation, support the exhaust system at the converter and align it to the under body of the vehicle. Install the converter to the front pipe flange and tighten the nuts on the converter studs. Attach the center Exhaust Hanger to the underbody and the rear Exhaust Hanger to the rear compartment rail. The front pipe to converter nuts then are to be tightened to 25 nm (18 ft. Lbs.), and finally the Oxygen Sensor h02s1plug in.
Exhaust Pipe
10371540
Q: How to replace the catalytic converter heat shield on Buick Park Avenue?
A: Begin heat shield repair by removing the exhaust system and protecting eyes before drilling rivets. Drilling through the rivets at the heat shield's center allows you to disengage it from the retaining stud by pulling downward until you can slide it to the left and remove it from beneath the oxygen sensor wiring harness heat shield. Operation begins with heat shield placement to the right side under oxygen sensor wiring harness shield before pushing upward onto the retaining stud until holes on shield match floor panel holes. Install both the oxygen sensor wiring harness heat shield and Catalytic Converter heat shield directly to the floor panel one at a time by using a rivet gun for their single rivet then keep installing other rivets before reinstalling the exhaust system.
Exhaust Pipe
12564240
Q: How to replace the oxidation catalytic converter on Buick Lucerne?
A: Begin by raising and supporting the vehicle before starting Catalytic Converter replacement work. The cut point should be marked on the converter outlet pipe at 36 mm (1.4 in) distance behind the oxidation Catalytic Converter weld. Use wrenches to cut through the converter outlet pipe at your specified mark and disconnect the oxidation Catalytic Converter to Muffler assembly nuts. You must pull the Muffler assembly backward to free up space before removing the oxidation Catalytic Converter from the vehicle while discarding the gasket. When installing the system users should slide the 2 service clamps onto the oxidation Catalytic Converter outlet pipe but should avoid tightening the clamp. A fresh gasket must be placed between the two catalytic converters and the exhaust system may need minor adjustment for proper fitting between the Catalytic Converter and Muffler assembly. After installing the oxidation converter between the Muffler and three-way converter, torque its nuts to 47 nm (35 lb ft). Position the clamps along the Catalytic Converter output pipe's middle section with opposite facing directions and keep them as close together as possible. Check the alignment of the oxidation Catalytic Converter with the Muffler assembly while tightening the clamps to 54 nm (40 lb ft). Drop the vehicle to the ground then conduct an exhaust leak inspection.