What is the purpose and process of servicing an oxygen sensor in a Chevrolet Impala and Monte Carlo?

An oxygen sensor is a galvanic battery that produces a small voltage output in response to the amount of oxygen in the exhaust gases. This voltage signal is the input side of the feedback loop between the oxygen sensor and the Powertrain Control Module (PCM). Without it, the PCM would be unable to correct the injector on-time to maintain the perfect air/fuel ratio of 14.7:1 that the catalyst needs for optimal operation. All vehicles have On-Board Diagnostics II (OBD-11) engine management systems, which use an oxygen sensor ahead of the catalytic converter and another oxygen sensor behind the catalytic converter to verify the accuracy of the feedback loop. The models have two heated oxygen sensors: one upstream sensor located on the rear exhaust manifold and a downstream sensor located under the vehicle, behind the catalytic converter. Both sensors are heated to speed up warm-up time. When servicing a sensor, special care must be taken to avoid damaging the pigtail or electrical connector, keeping contaminants away, and not using cleaning solvents. Oxygen sensors are delicate and should not be dropped or handled roughly. The silicone boot on the sensor must be installed correctly to prevent melting. When replacing the upstream oxygen sensor, the ignition coil assembly may need to be removed for better access. The sensor can be unscrewed using an oxygen sensor socket, and if reusing the old sensor, anti-seize compound should be applied to the threads. The installation process is the reverse of removal. For the downstream oxygen sensor, the vehicle must be raised and securely placed on jackstands. The sensor can be located and disconnected, then unscrewed using an oxygen sensor socket. Again, if reusing the old sensor, anti-seize compound should be applied to the threads. The installation process is the reverse of removal.

Genuine Chevrolet Impala Oxygen Sensor

Oxygen O2 Sensor

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20 Oxygen Sensors found

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Chevrolet Impala Sensor Asm,Heated Oxygen
Part Number: 19178958
$60.51 MSRP: $125.66
You Save: $65.15 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Manifold, Oxygen Sensor
- Replaces: 25312203, 25178022, 25164488, 25312211
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2000-2003 Chevrolet Impala | IMPALA, LS, LUMINA, SS | 6 Cyl 3.4L, 6 Cyl 3.8L
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Chevrolet Impala Sensor,Heated Oxygen
Part Number: 12559850
$37.12 MSRP: $119.40
You Save: $82.28 (69%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2005 Chevrolet Impala | IMPALA, LS, LT, LUMINA, POLICE CAR, SS | 6 Cyl 3.4L
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Pre, Cataly
Part Number: 12634061
$50.22 MSRP: $90.08
You Save: $39.86 (45%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Replaces: 12607333
- 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
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Pre, Cataly
Part Number: 12640453
$49.91 MSRP: $103.62
You Save: $53.71 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- 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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Chevrolet Impala Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12616502
$78.37 MSRP: $162.72
You Save: $84.35 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Replaces: 12617648
- 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
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Chevrolet Impala Sensor Asm,Heated Oxygen
Part Number: 19178930
$61.22 MSRP: $127.12
You Save: $65.90 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Replaces: 25171579, 25312184, 25165313
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994-1996 Chevrolet Impala | CLASSIC 4 DOOR, CLASSIC STATION WAGON, LS 4 DOOR | 8 Cyl 5.7L
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12608662
$58.55 MSRP: $121.58
You Save: $63.03 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2011 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 Flex
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Chevrolet Impala Sensor Asm,Heated Oxygen (Position 2)
Part Number: 19209807
$59.38 MSRP: $123.30
You Save: $63.92 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Replaces: 12570149, 12572772, 12574924
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2007 Chevrolet Impala | IMPALA, LS, LT, POLICE CAR, SS | 6 Cyl 3.4L, 6 Cyl 3.5L, 6 Cyl 3.5L Flex, 6 Cyl 3.8L, 6 Cyl 3.9L, 8 Cyl 5.3L
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Chevrolet Impala Sensor Asm,Heated Oxygen (Position 1)
Part Number: 19209814
$56.40 MSRP: $117.12
You Save: $60.72 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Replaces: 12574218
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2005 Chevrolet Impala | IMPALA, LS, LT, POLICE CAR, SS | 6 Cyl 3.8L
View related parts
Chevrolet Impala Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12580466
$64.39 MSRP: $133.71
You Save: $69.32 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- 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 | 8 Cyl 5.3L
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12590789
$52.53 MSRP: $109.07
You Save: $56.54 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005 Chevrolet Impala | IMPALA, LS, LT | 6 Cyl 3.4L
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Pre, Catalyst B2S1)
Part Number: 12643707
$44.51 MSRP: $69.20
You Save: $24.69 (36%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Replaces: 12627139
- 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
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Chevrolet Impala Sensor Asm,Heated Oxygen
Part Number: 19178747
$80.49 MSRP: $151.86
You Save: $71.37 (47%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Replaced by: 19355307
- Replaces: 25318321
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2000-2003 Chevrolet Impala | IMPALA, LS, SS | 6 Cyl 3.4L, 6 Cyl 3.8L
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Post, Catalyst Bank 1 Sensor 2)
Part Number: 12661898
$60.33 MSRP: $125.29
You Save: $64.96 (52%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Replaces: 12643903
- 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
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Chevrolet Impala Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12584925
$77.97 MSRP: $161.89
You Save: $83.92 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2011 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, 6 Cyl 3.9L Flex
View related parts
Chevrolet Impala Sensor Assembly, Heated Oxygen (Post, Catalyst Bank 1
Part Number: 12656543
$90.03 MSRP: $186.94
You Save: $96.91 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor Assembly, Htd Oxy (Post, Catalyst Bank 1
- Replaces: 12639693, 12646200
- 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 Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12615124
$90.03 MSRP: $186.94
You Save: $96.91 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2009 Chevrolet Impala | LS, LS POLICE CAR, LT, LT 3.5, LTZ, SS | 8 Cyl 5.3L
View related parts
Chevrolet Impala Sensor Asm,Oxygen
Part Number: 25176705
$79.99 MSRP: $212.15
You Save: $132.16 (63%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985 Chevrolet Impala | 4 DOOR, CLASSIC 2 DOOR, CLASSIC 4 DOOR, CLASSIC STATION WAGON | 6 Cyl 4.3L
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Chevrolet Impala Sensor,Exhaust Oxygen
Part Number: 19211437
$15.80 MSRP: $33.26
You Save: $17.46 (53%)
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Replaces: 19178952, 25162600, 25106073, 25132068, 25166816, 25171574, 25107378, 25162693, 25165118, 25171581, 25165120, 25171573, 19178943, 19178953, 19178919, 25162753, 25133185, 25133076
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1982-1985 Chevrolet Impala | 4 DOOR, CLASSIC 2 DOOR, CLASSIC 4 DOOR, CLASSIC STATION WAGON, STATION WAGON | 6 Cyl 3.8L, 6 Cyl 4.3L, 8 Cyl 4.4L, 8 Cyl 5.0L
View related parts
Chevrolet Impala Sensor Asm,Heated Oxygen (Position 2)
Part Number: 19178922
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Replaces: 12578459
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004 Chevrolet Impala | IMPALA, LS, POLICE CAR | 6 Cyl 3.4L

Chevrolet Impala Oxygen Sensor Parts Questions & Experts Answers

Sensor Assembly, Heated Oxygen (Position 1)
12580466
Q: What is the purpose and process of servicing an oxygen sensor in a Chevrolet Impala and Monte Carlo?
A: An oxygen sensor is a galvanic battery that produces a small voltage output in response to the amount of oxygen in the exhaust gases. This voltage signal is the input side of the feedback loop between the oxygen sensor and the Powertrain Control Module (PCM). Without it, the PCM would be unable to correct the injector on-time to maintain the perfect air/fuel ratio of 14.7:1 that the catalyst needs for optimal operation. All vehicles have On-Board Diagnostics II (OBD-11) engine management systems, which use an oxygen sensor ahead of the Catalytic Converter and another oxygen sensor behind the catalytic converter to verify the accuracy of the feedback loop. The models have two heated oxygen sensors: one upstream sensor located on the rear exhaust manifold and a downstream sensor located under the vehicle, behind the catalytic converter. Both sensors are heated to speed up warm-up time. When servicing a sensor, special care must be taken to avoid damaging the pigtail or electrical connector, keeping contaminants away, and not using cleaning solvents. Oxygen sensors are delicate and should not be dropped or handled roughly. The silicone boot on the sensor must be installed correctly to prevent melting. When replacing the upstream oxygen sensor, the ignition coil assembly may need to be removed for better access. The sensor can be unscrewed using an oxygen sensor socket, and if reusing the old sensor, anti-seize compound should be applied to the threads. The installation process is the reverse of removal. For the downstream oxygen sensor, the vehicle must be raised and securely placed on jackstands. The sensor can be located and disconnected, then unscrewed using an oxygen sensor socket. Again, if reusing the old sensor, anti-seize compound should be applied to the threads. The installation process is the reverse of removal.