How to replace a catalytic converter on Buick LaCrosse?

First remove Catalytic Converter by lifting up the vehicle and support it. Secondly, disconnect the heated Oxygen Sensor (HO2S) electrical connector. Sweep the nuts off the exhaust manifold pipe and the exhaust manifold pipe gasket . Support on the exhaust system then remove the Catalytic Converter nuts and hangers then Catalytic Converter itself and its gasket in that order. Check and clean the mating areas of the exhaust manifold and exhaust pipe gasket remove the ho2s. Starting with installation, install the ho2s while ensuring the Catalytic Converter assembly is supported to prevent internal damage with vertical movement at most of 6 degrees. Mount the new gasket onto the exhaust pipe studs then support and mount the Catalytic Converter and selling the nuts till it is tightened to 60nm (44 lb ft). Next, change the new exhaust manifold pipe gasket and exhaust manifold pipe stud nuts , which should be tightened on 35 n.m (26 lb ft). Replace the Catalytic Converter hangers, remove the support from the exhaust system, and also put the ho2s electrical connector. Lastly, check the exhaust system against leakage and underbody contact before dropping the vehicle.

How to replace a three way catalytic converter on Buick Regal?

To replace the three way Catalytic Converter, initially lift and properly supported the vehicle. Unplug and unbolt the heated Oxygen Sensor wiring harness connector and retainers. Make sure that before you remove the bolts and gasket holding the Catalytic Converter in place that the exhaust system has proper support. Then, unlatch the exhaust manifold pipe stud nuts and the three way Catalytic Converter, and the exhaust manifold pipe gasket at exhaust manifold pipe studs must also be removed. Remove the heated Oxygen Sensor. For installation, you can start by installing the heated Oxygen Sensor and another new exhaust manifold pipe gasket to the exhaust manifold pipe studs. Support the three way Catalytic Converter and fasten the exhaust manifold pipe with stud nuts using 35 nm (26 ft. Lbs.). Install the Catalytic Converter Gasket and bolts by putting bolts tension of 45 nm (33 ft. Lbs.). Reconnect the heated o2 sensor wire harness connector and retainers, remove the support from the exhaust system, check for leaks and underbody contact, and finally, lower the vehicle. You should always replace the gaskets on the front and rear flanges when you service the Catalytic Converter assembly and never fit the orignal gasket.

OEM Buick Catalytic Converter

Cat. Converter

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172 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: 15861401
$1042.14 MSRP: $1552.17
You Save: $510.03 (33%)
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Product Specifications
- Other Name: Converter Assembly-3Way Catalytic (W/Exhaust Manifold P; Exhaust Pipe
Fits the following Buick Models:
- LaCrosse | 2006 | CX, CXL | 6 Cyl 3.8 L GAS
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Buick Catalytic Converter Part Number: 25204363
$367.79 MSRP: $575.56
You Save: $207.77 (37%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Envista | 2024-2025 | Avenir, Preferred, Sport Touring | 3 Cyl 1.2 L FLEX, 3 Cyl 1.2 L GAS
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Buick Catalytic Converter Part Number: 25204733
$371.95 MSRP: $582.08
You Save: $210.13 (37%)
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Encore GX | 2024-2025 | Avenir, Preferred, Sport Touring | 3 Cyl 1.3 L GAS
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Buick Catalytic Converter Part Number: 25204734
$1071.48 MSRP: $1676.80
You Save: $605.32 (37%)
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Encore GX | 2024-2025 | Avenir, Preferred, Sport Touring | 3 Cyl 1.3 L GAS
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Buick Catalytic Converter, Rear Part Number: 19419603
$1241.62 MSRP: $1956.79
You Save: $715.17 (37%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Rear Manifold Pipe) "Kit"; Converter, Catalytic Converter
- Position: Rear
- Replaces: 22907437
Fits the following Buick Models:
- Verano | 2012-2015 | Base, Convenience, Leather | 4 Cyl 2.4 L FLEX
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Buick Catalytic Converter Part Number: 19418968
$936.14
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe) "Kit"
- Replaces: 20906951
Fits the following Buick Models:
- Enclave | 2012-2015 | Base, Convenience, Leather, Premium | 6 Cyl 3.6 L GAS
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Buick Catalytic Converter, Driver Side Part Number: 84462801
$551.62 MSRP: $850.12
You Save: $298.50 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter, Catalytic Converter; Preconverter
- Position: Driver Side
- Replaces: 84215483
Fits the following Buick Models:
- LaCrosse | 2018-2019 | Avenir, Essence, Preferred, Premium, Sport Touring | 6 Cyl 3.6 L GAS
- Regal Sportback | 2018-2020 | GS | 6 Cyl 3.6 L GAS
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Buick Catalytic Converter Part Number: 19418938
$652.36 MSRP: $971.28
You Save: $318.92 (33%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe) "Kit"
- Replaces: 15903508
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: 55582030
$633.36 MSRP: $978.04
You Save: $344.68 (36%)
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Cascada | 2016-2019 | Base, Premium, Sport Touring | 4 Cyl 1.6 L GAS
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Buick Catalytic Converter, Driver Side Part Number: 19420303
$633.91 MSRP: $978.88
You Save: $344.97 (36%)
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
- Position: Driver Side
- Replaces: 23229313
Fits the following Buick Models:
- Enclave | 2016-2017 | Convenience, Leather, Premium | 6 Cyl 3.6 L GAS
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Buick Catalytic Converter, Passenger Side Part Number: 19420290
$786.51 MSRP: $1217.70
You Save: $431.19 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe)
- Position: Passenger Side
- Replaces: 23229314
Fits the following Buick Models:
- Enclave | 2016-2017 | Convenience, Leather, Premium | 6 Cyl 3.6 L GAS
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Buick Catalytic Converter Part Number: 19419593
$787.70 MSRP: $1219.57
You Save: $431.87 (36%)
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Front Manifold Pipe) "Kit"
- Replaces: 20965402
Fits the following Buick Models:
- LaCrosse | 2012-2016 | Base, Convenience, Leather, Premium, Sport Touring, Touring | 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS
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Buick Exhaust Manifold Part Number: 22737797
$880.36 MSRP: $1364.56
You Save: $484.20 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter, Catalytic Converter; Preconverter; Catalytic Converter
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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Buick Catalytic Converter, Passenger Side Part Number: 19418927
$909.24 MSRP: $1409.76
You Save: $500.52 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, 3Way Catalytic (W/Exhaust Pipe) "Kit"
- Position: Passenger Side
- Replaces: 20906953
Fits the following Buick Models:
- Enclave | 2012-2015 | Base, Convenience, Leather, Premium | 6 Cyl 3.6 L GAS
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Buick Catalytic Converter Part Number: 12676948
$967.39 MSRP: $1500.78
You Save: $533.39 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- LaCrosse | 2018-2019 | Base, Essence, Preferred, Premium | 4 Cyl 2.5 L MILD HYBRID EV-GAS (MHEV)
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Buick Catalytic Converter Part Number: 19420223
$1092.02 MSRP: $1695.80
You Save: $603.78 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter Assembly, Warm Up 3Way Catalytic (Kit); Converter; Converter, Catalytic Converter
- Replaces: 12645922, 12660225
Fits the following Buick Models:
- Envision | 2016-2018 | Premium | 4 Cyl 2.0 L GAS
- Regal | 2014-2017 | Base, GS, Premium, Sport Touring | 4 Cyl 2.0 L GAS
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Buick Catalytic Converter Part Number: 55516915
$1134.49 MSRP: $1762.27
You Save: $627.78 (36%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Converter, Catalytic Converter; Converter & Pipe
- Replaces: 55515136
Fits the following Buick Models:
- Envision | 2021-2023 | Avenir, Essence, Preferred | 4 Cyl 2.0 L GAS
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Buick Exhaust Pipe Part Number: 12564240
$61.91 MSRP: $92.15
You Save: $30.24 (33%)
Product Specifications
- Other Name: Pipe, Exhaust Pipe; Crossover Pipe; Front Pipe; Cross Over Pipe
- Replaces: 12556489
Fits the following Buick Models:
- Lucerne | 2006-2011 | CXL, CXS, Super | 8 Cyl 4.6 L GAS
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Buick Converter & Pipe Part Number: 12728318
$1179.85 MSRP: $1758.93
You Save: $579.08 (33%)
Product Specifications
- Other Name: Converter, Catalytic Converter
Fits the following Buick Models:
- Envision | 2024-2025 | Avenir, Preferred, Sport Touring | 4 Cyl 2.0 L GAS

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Buick Catalytic Converter

Choose OEM Catalytic Converter, you're making the optimal decision for superior quality and perfect performance. You can feel confident because each component goes through stringent quality checks. Every part is carefully built to comply with Buick's factory specifications. You'll enjoy a smooth, worry-free installation that fits just right. At ChevyPartsDeal.com, you'll find it easy to get top-quality OEM Buick Catalytic Converter. You can shop at highly competitive prices and protect your budget. All our genuine Buick parts include a dependable manufacturer's warranty. You'll also appreciate our straightforward return policy and swift delivery services for extra convenience.

Buick Catalytic Converter cuts down on the emission of harmful gas that causes harm to the drives, but does not kill the performance. In 1903, Buick entered the U.S. roads and continued to refine the smooth ride. Premium sound dampers the wind and traffic clatter making conversation effortless. Leisurely suspension and plush seating make everyday traffic a smooth ride. Traditional curves are blended with the contemporary screen, protection and smooth phone connectivity. The Wildcat EV concept of 2022 marked an indication of Buick electric power without foregoing serenity. The brand demonstrates that you can be high-end without having to boast about it. Its cabins combine soft touch with easy to use controls, reducing distraction and increasing comfort. Fatigue over long hauls reduces courtesy of balanced chassis rigidity and luxurious damping. Despite emerging technology, the brand remains conservative in its styling that withers through the years. The exhaust flow passes through a Catalytic Converter filled with platinum, palladium, and rhodium, which reacts at high speed resulting in the conversion of carbon monoxide, unburned hydrocarbons, and nitrogen oxides that form smog into harmless water, carbon dioxide and nitrogen without obstructing the normal operation of the engine to give good throttle response. Installed as either a direct fit unit that bolts directly on or as a universal unit that is sized in advance, the converter does not like emissions, does not choke the flow and in large flow designs does not even leave power upgrades room to shine. The 3-way chemistry, which is dated 1981, nevertheless forms the basis of all modern Catalytic Converters and demonstrates how simple metal honeycombs can silently protect the air mile after air mile.

Buick Catalytic Converter Parts and Q&A

Catalytic Converter
19332467
Q: How to replace a catalytic converter on Buick LaCrosse?
A:
First remove Catalytic Converter by lifting up the vehicle and support it. Secondly, disconnect the heated Oxygen Sensor (HO2S) electrical connector. Sweep the nuts off the exhaust manifold pipe and the exhaust manifold pipe gasket . Support on the exhaust system then remove the Catalytic Converter nuts and hangers then Catalytic Converter itself and its gasket in that order. Check and clean the mating areas of the exhaust manifold and exhaust pipe gasket remove the ho2s. Starting with installation, install the ho2s while ensuring the Catalytic Converter assembly is supported to prevent internal damage with vertical movement at most of 6 degrees. Mount the new gasket onto the exhaust pipe studs then support and mount the Catalytic Converter and selling the nuts till it is tightened to 60nm (44 lb ft). Next, change the new exhaust manifold pipe gasket and exhaust manifold pipe stud nuts , which should be tightened on 35 n.m (26 lb ft). Replace the Catalytic Converter hangers, remove the support from the exhaust system, and also put the ho2s electrical connector. Lastly, check the exhaust system against leakage and underbody contact before dropping the vehicle.
Cross Over
24503125
Q: How to replace a three way catalytic converter on Buick Regal?
A:
To replace the three way Catalytic Converter, initially lift and properly supported the vehicle. Unplug and unbolt the heated Oxygen Sensor wiring harness connector and retainers. Make sure that before you remove the bolts and gasket holding the Catalytic Converter in place that the exhaust system has proper support. Then, unlatch the exhaust manifold pipe stud nuts and the three way Catalytic Converter, and the exhaust manifold pipe gasket at exhaust manifold pipe studs must also be removed. Remove the heated Oxygen Sensor. For installation, you can start by installing the heated Oxygen Sensor and another new exhaust manifold pipe gasket to the exhaust manifold pipe studs. Support the three way Catalytic Converter and fasten the exhaust manifold pipe with stud nuts using 35 nm (26 ft. Lbs.). Install the Catalytic Converter Gasket and bolts by putting bolts tension of 45 nm (33 ft. Lbs.). Reconnect the heated o2 sensor wire harness connector and retainers, remove the support from the exhaust system, check for leaks and underbody contact, and finally, lower the vehicle. You should always replace the gaskets on the front and rear flanges when you service the Catalytic Converter assembly and never fit the orignal gasket.