What tools and precautions are necessary for replacing the Heated Oxygen Sensor (HO2S) on Buick Regal?

The replacement of heated Oxygen Sensor (HO2S) requires using the Oxygen Sensor wrench (J 39194) as a necessary tool. Proper handling of both ho2s and o2s requires attention to their in-line electrical connector and louvered end so they stay free from debris and contaminants but never use cleaning fluids because of safety concerns. Before removing bank 1 sensor 2 always verify your engine temperature exceeds 48°c (120°F) since this will defend against Exhaust Manifold or Exhaust Pipe threading damage. Perform the following sequence to start: turn off the ignition followed by vehicle lifting and support installation. To remove the ho2s electrical connector, first push out the tab protecting the electrical connector then detach the Oxygen Sensor connection from the connector assembly. The Oxygen Sensor wrench (J 39194) will extract the Oxygen Sensor from the Exhaust Pipe. The Oxygen Sensor threads require installation with a special anti-seize compound. Treatment should be already present on fresh sensors. Oxygen sensors getting new service require existing anti-seize compound but when reinstalling used sensors they need equivalent anti-seize compound p/n 5613695. The Oxygen Sensor needs to be installed into the Exhaust Pipe at a wrench torque of 41 n.m (30 lb ft). Secure the ho2s connector to its electrical connector while installing the retaining tab before lowering the vehicle.

OEM Buick Regal Oxygen Sensor

Oxygen O2 Sensor

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18 Oxygen Sensors found

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Buick Regal Oxygen Sensor Part Number: 19209807
$87.79 MSRP: $178.30
You Save: $90.51 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor; Front Oxygen Sensor
- Replaces: 12570149, 12574924, 12572772
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2004 Buick Regal | GS, LS | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19178938
$63.56 MSRP: $129.10
You Save: $65.54 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaces: 25165314, 25161152, 25312185
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1993 Buick Regal | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19209814
$59.22 MSRP: $120.28
You Save: $61.06 (51%)
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Product Specifications
- Other Name: Sensor Assembly, Heated Oxygen (Position 1); Front Oxygen Sensor; Sensor, Computer Control Sensors
- Replaces: 12574218
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004 Buick Regal | GS, LS | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19178958
$65.65 MSRP: $133.34
You Save: $67.69 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor; Manifold
- Replaces: 25178022, 25312203, 25312211, 25164488
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1997-2003 Buick Regal | 25th Anniversary Edition, GS, GSE, LS, LSE | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19178930
$66.41 MSRP: $134.88
You Save: $68.47 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor
- Replaces: 25312184, 25165313, 25171579
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1993-1996 Buick Regal | Custom, Gran Sport, Limited, Olympic Gold Edition | 6 Cyl 3.1 L GAS, 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19178924
$71.63 MSRP: $145.48
You Save: $73.85 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor
- Replaces: 25161130, 25312207, 12587214, 19178921, 25164983, 25312196
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-1999 Buick Regal | 25th Anniversary Edition, Custom, Gran Sport, GS, Limited, LS, Olympic Gold Edition | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19178747
$83.90 MSRP: $151.86
You Save: $67.96 (45%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaced by: 19355307
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1999-2004 Buick Regal | GS, GSE, LS, LSE | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 12643707
$44.51 MSRP: $70.58
You Save: $26.07 (37%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor; Upper Oxygen Sensor
- Replaces: 12627139
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2017 Buick Regal | Base, GS, Premium, Sport Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS
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Buick Regal Oxygen Sensor Part Number: 12640115
$93.88 MSRP: $190.68
You Save: $96.80 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2013 Buick Regal | CXL, GS, Premium | 4 Cyl 2.0 L FLEX
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Buick Regal Oxygen Sensor Part Number: 12616502
$73.54 MSRP: $149.38
You Save: $75.84 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Position 1); Front Oxygen Sensor; Upper Oxygen Sensor; Sensor, Computer Control Sensors
- Replaces: 12617648
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2017 Buick Regal | Base, CXL, GS, Premium | 4 Cyl 2.0 L FLEX, 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 Regal Oxygen Sensor Part Number: 25176705
$17.28 MSRP: $212.15
You Save: $194.87 (92%)
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Product Specifications
- Other Name: Sensor Assembly, Oxygen; Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1987 Buick Regal | Base, GNX, Grand National, Limited, T-Type | 6 Cyl 3.8 L GAS, 6 Cyl 4.1 L GAS, 6 Cyl 4.3 L DIESEL
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Buick Regal Oxygen Sensor Part Number: 12618011
$51.71 MSRP: $145.60
You Save: $93.89 (65%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Position 2); Rear Oxygen Sensor; Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011 Buick Regal | CXL | 4 Cyl 2.4 L GAS
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Buick Regal Oxygen Sensor Part Number: 25176708
$55.59 MSRP: $112.89
You Save: $57.30 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Assembly, Oxygen; Sensor, Computer Control Sensors
- Replaces: 10096129
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1993 Buick Regal | Custom, Limited | 6 Cyl 3.1 L GAS
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Buick Regal Oxygen Sensor Part Number: 12661898
$63.01 MSRP: $127.99
You Save: $64.98 (51%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor; Lower Oxygen Sensor
- Replaces: 12643903
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2017 Buick Regal | Base, GS, Premium, Sport Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L FLEX, 4 Cyl 2.4 L GAS
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Buick Regal Oxygen Sensor Part Number: 12656543
$62.58 MSRP: $176.24
You Save: $113.66 (65%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor; Lower Oxygen Sensor
- Replaces: 12646200, 12639693
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2017 Buick Regal | 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 Regal Oxygen Sensor Part Number: 19178117
Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaces: 25164155, 25133737
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994-1995 Buick Regal | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19178937
Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaces: 25133791, 25312188
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 Buick Regal | Custom, Gran Sport, Limited | 6 Cyl 3.8 L GAS
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Buick Regal Oxygen Sensor Part Number: 19211437
$19.00 MSRP: $33.92
You Save: $14.92 (44%)
Product Specifications
- Other Name: Sensor, Computer Control Sensors; Sensor, Emission Control Sensor(Vehicle Speed); Sensor, Emission Control Sensor(Oxygen)
- Replaces: 19178952, 25171573, 25166816, 25171574, 25162693, 25106073, 25107378, 25165118, 25171581, 25132068, 25165120, 25162600, 19178953, 19178943, 25133185, 25133076, 19178919, 25162753
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1988-1993 Buick Regal | Custom, Gran Sport, Limited | 6 Cyl 2.8 L GAS, 6 Cyl 3.1 L GAS, 6 Cyl 3.8 L GAS

Buick Regal Oxygen Sensor

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The Oxygen Sensor encountered in Buick Regal vehicles is equally important in determining the amount of unburned oxygen in the exhaust so as to configure the ideal air-fuel mixture and the least emissions. It produces an electrical voltage which is proportional with the amount of oxygen and therefore the engine control computer can change the fuel injector pulse in accordance with the existing level of oxygen. The Buick Regal Company mostly uses two oxygen sensors, one before the catalytic converter the other after it while V6 or V8 vehicles have one more sensor for each cylinder. Zirconium dioxide oxygen sensors are used in most of the Buick Regal vehicles and comprises of narrow-band oxygen sensors and wide-band oxygen sensors. Narrow-band sensors give only rich/lean signal while on the other hand wide-band sensors give broader range of signals of air fuel mixture. They do not differ with regard to the nature of the information they deliver, however, wideband sensors offer more comprehensive operating principles. These devices wear out with time, get contaminated and if not replaced, they increase emission levels and reduce fuel consumption, therefore, should be replaced for enhanced vehicle performance.

Buick Regal Oxygen Sensor Parts Questions & Experts Answers

Oxygen Sensor
19178747
Q: What tools and precautions are necessary for replacing the Heated Oxygen Sensor (HO2S) on Buick Regal?
A:
The replacement of heated Oxygen Sensor (HO2S) requires using the Oxygen Sensor wrench (J 39194) as a necessary tool. Proper handling of both ho2s and o2s requires attention to their in-line electrical connector and louvered end so they stay free from debris and contaminants but never use cleaning fluids because of safety concerns. Before removing bank 1 sensor 2 always verify your engine temperature exceeds 48°c (120°F) since this will defend against Exhaust Manifold or Exhaust Pipe threading damage. Perform the following sequence to start: turn off the ignition followed by vehicle lifting and support installation. To remove the ho2s electrical connector, first push out the tab protecting the electrical connector then detach the Oxygen Sensor connection from the connector assembly. The Oxygen Sensor wrench (J 39194) will extract the Oxygen Sensor from the Exhaust Pipe. The Oxygen Sensor threads require installation with a special anti-seize compound. Treatment should be already present on fresh sensors. Oxygen sensors getting new service require existing anti-seize compound but when reinstalling used sensors they need equivalent anti-seize compound p/n 5613695. The Oxygen Sensor needs to be installed into the Exhaust Pipe at a wrench torque of 41 n.m (30 lb ft). Secure the ho2s connector to its electrical connector while installing the retaining tab before lowering the vehicle.