What is the purpose and operation of the oxygen sensor in a Chevrolet Express's exhaust system?

The oxygen sensor in an auto's exhaust system interacts with the oxygen to generate a voltage output showing how much of this gas is left in the exhaust. The PCM uses this feedback signal to compute the necessary fuel injector pulse width and control A/F ratio. For minimum emissions and fuel economy, the best ratio comprises 14.7 parts of air to 1 part of fuel. To ascertain whether or not it is working properly, the post-converter oxygen sensor monitors the efficiency of the catalytic converter. Model and emissions package determine how the oxygen sensors are configured. It operates correctly when there are good electrical connections, sufficient air circulation, it has reached its operating temperature range, and unleaded fuel is used. The PCM detects sensor problems and sets DTCs. In order to replace an oxygen sensor on your vehicle, raise it, locate the sensor, disconnect its electrical connector. Using a wrench or an oxygen sensor socket remove the sensor from its place. In case you want to reuse that old one clean out threads and put on some anti-seize compound on them. After removal of O2 sensor it should be reinstalled firmly following prescribed torque specifications for this particular device.

Genuine Chevrolet Express Oxygen Sensor

Oxygen O2 Sensor

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17 Oxygen Sensors found

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Chevrolet Express Sensor Asm,Heated Oxygen
Part Number: 19178918
$42.74 MSRP: $76.66
You Save: $33.92 (45%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Replaces: 25163079, 25312200
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Express | 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L
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Chevrolet Express Sensor Asm,Heated Oxygen
Part Number: 19178934
$67.29 MSRP: $139.72
You Save: $72.43 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Replaces: 25160540, 25312191
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.7L, 8 Cyl 7.4L
View related parts
Chevrolet Express Sensor Asm,Heated Oxygen (Position 3)
Part Number: 19209808
$49.59 MSRP: $102.98
You Save: $53.39 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 25333812, 12573168, 12583806, 19210711, 12575389, 19256731
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2007 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
View related parts
Chevrolet Express Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12599204
$94.08 MSRP: $195.36
You Save: $101.28 (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:
- 2007-2015 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON CARGO SAVANA, 1/2 TON PASSENGER EXPRESS, 1/2 TON PASSENGER SAVANA, 3/4 TON CARGO EXPRESS, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER EXPRESS, 3/4 TON PASSENGER SAVANA | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
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Chevrolet Express Sensor Assembly, Heated Oxygen (Post, Catal
Part Number: 12637297
$39.46 MSRP: $81.93
You Save: $42.47 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2011-2013 Chevrolet Express | 1 TON COMMERCIAL/RV CUTAWAY | 8 Cyl 4.8L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
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Chevrolet Express Sensor Assembly, Heated Oxygen(Pre, Catalyst Bank 1 Se
Part Number: 12666612
$42.69 MSRP: $88.65
You Save: $45.96 (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:
- 2016-2020 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 4.8L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
View related parts
Chevrolet Express Sensor Assembly, Heated Oxygen (Position 3)
Part Number: 12612571
$87.66 MSRP: $182.02
You Save: $94.36 (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:
- 2008-2015 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON CARGO SAVANA, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON CARGO SAVANA, 1/2 TON PASSENGER EXPRESS, 1/2 TON PASSENGER SAVANA, 3/4 TON CARGO EXPRESS, 3/4 TON CARGO SAVANA, 3/4 TON PASSENGER EXPRESS, 3/4 TON PASSENGER SAVANA | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 4.8L Flex, 8 Cyl 5.3L, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
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Chevrolet Express Sensor Assembly, Heated Oxygen
Part Number: 12565397
$63.26 MSRP: $131.37
You Save: $68.11 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor
- Replaces: 12563346
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2002 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER | 8 Cyl 8.1L
View related parts
Chevrolet Express Sensor Assembly, Htd Oxy (Post, Catalyst Bank 1
Part Number: 12670253
$36.14 MSRP: $75.04
You Save: $38.90 (52%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Lower Oxygen Sensor, Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L
View related parts
Chevrolet Express Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12612797
$62.36 MSRP: $129.50
You Save: $67.14 (52%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2015 Chevrolet Express | 1 TON COMMERCIAL/RV CUTAWAY | 8 Cyl 6.0L, 8 Cyl 6.0L Flex
View related parts
Chevrolet Express Sensor Assembly, Heated Oxygen (Post, Catalyst Bank 1
Part Number: 12657188
$35.21 MSRP: $63.16
You Save: $27.95 (45%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2016-2020 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 4.8L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
View related parts
Chevrolet Express SENSOR ASM,HTD OXY<DO NOT USE, CONTACT TECH SPECIALIST
Part Number: 19355306
$55.10 MSRP: $114.42
You Save: $59.32 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor
- Replaces: 25163080, 25312201, 19178116
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RECREATIONAL VEHICLE EXPRESS, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.0L, 8 Cyl 5.7L, 8 Cyl 7.4L
View related parts
Chevrolet Express Sensor Asm,Heated Oxygen (Position 3)
Part Number: 19209805
$77.72 MSRP: $161.38
You Save: $83.66 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 19256730, 12581346, 19210712, 12590750
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2007 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L
View related parts
Chevrolet Express Sensor Assembly, Heated Oxygen (Position 1)
Part Number: 12584925
$83.55 MSRP: $157.63
You Save: $74.08 (47%)
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:
- 2007 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 8 Cyl 4.8L
View related parts
Chevrolet Express Sensor Assembly, Htd Oxy(Pre, Catalyst Bank 1 Se
Part Number: 12679885
$43.98 MSRP: $78.88
You Save: $34.90 (45%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Oxygen Sensor, Upper Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Express | 1 TON CARGO EXPRESS, 1 TON COMMERCIAL/RV CUTAWAY, 1 TON PASSENGER, 3/4 TON CARGO EXPRESS, 3/4 TON PASSENGER EXPRESS | 6 Cyl 4.3L
View related parts
Chevrolet Express Sensor Assembly, Heated Oxygen (Position 3)
Part Number: 12656071
$87.66 MSRP: $182.02
You Save: $94.36 (52%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2013-2015 Chevrolet Express | 1 TON COMMERCIAL/RV CUTAWAY | 8 Cyl 4.8L Flex, 8 Cyl 6.0L, 8 Cyl 6.0L Flex
View related parts
Chevrolet Express Sensor Asm,Heated Oxygen (Position 3)
Part Number: 19209816
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 12600893, 12611870
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 Chevrolet Express | 1/2 TON CARGO EXPRESS, 1/2 TON PASSENGER EXPRESS | 6 Cyl 4.3L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex

Chevrolet Express Oxygen Sensor Parts Questions & Experts Answers

Sensor Asm,Heated Oxygen (Position 3)
19209816
Q: What is the purpose and operation of the oxygen sensor in a Chevrolet Express's exhaust system?
A: The oxygen sensor in an auto's exhaust system interacts with the oxygen to generate a voltage output showing how much of this gas is left in the exhaust. The PCM uses this feedback signal to compute the necessary fuel injector pulse width and control A/F ratio. For minimum emissions and fuel economy, the best ratio comprises 14.7 parts of air to 1 part of fuel. To ascertain whether or not it is working properly, the post-converter oxygen sensor monitors the efficiency of the Catalytic Converter. Model and emissions package determine how the oxygen sensors are configured. It operates correctly when there are good electrical connections, sufficient air circulation, it has reached its operating temperature range, and unleaded fuel is used. The PCM detects sensor problems and sets DTCs. In order to replace an oxygen sensor on your vehicle, raise it, locate the sensor, disconnect its electrical connector. Using a wrench or an oxygen sensor socket remove the sensor from its place. In case you want to reuse that old one clean out threads and put on some anti-seize compound on them. After removal of O2 sensor it should be reinstalled firmly following prescribed torque specifications for this particular device.