What are the guidelines for replacing oxygen sensors in Chevrolet Trailblazer?

There are two oxygen sensors in all models namely; a pre-converter O2 sensor and post-converter O2 sensor. This O2 sensor measures the amount of oxygen left in the combustion process' exhaust gas and produces a voltage that changes with the amount of oxygen. The PCM constantly receives voltage signals from the pre-converter O2 sensor to determine the necessary fuel injector pulse width and keep an air-fuel ratio at 14.7:1. On the other hand, post-converter oxygen sensor does not affect control of air/fuel ratio by PCM, but it is instrumental in monitoring catalyst converter efficiency. In case of any problem with an oxygen sensor, the PCM can identify this and set diagnostic difficulty codes specific for each malfunction. To replace an oxygen sensor such as avoiding detaching pigtail or electrical connector, keeping away contaminants from sensors, using anti-freeze compound on thread and not utilizing cleaning solvents which should be followed strictly. It is possible to replace the sensor without raising the vehicle regarding preconverter sensor while with post converter one it calls for lifting vehicle up and placing on jackstands firmly. Consequently, it is advisable to undo electrical connection through suitable wrench or specialized oxgen socket so as to unscrew this socket by the same tool recommended for it. Apply anti-seize compound before making sure that you have tighten that thing well prior to attaching electrical connector then slowly lowering down a car at last.

Genuine Chevrolet Trailblazer Oxygen Sensor

Oxygen O2 Sensor

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21 Oxygen Sensors found

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Chevrolet Trailblazer Sensor,Heated Oxygen(Position 2)
Part Number: 12578624
$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
- Replaces: 24577303
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2005 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12590749
$28.91 MSRP: $92.99
You Save: $64.08 (69%)
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:
- 2007-2009 Chevrolet Trailblazer | 4 DOOR | 8 Cyl 5.3L, 8 Cyl 6.0L
View related parts
Chevrolet Trailblazer Sensor,Heated Oxygen(Position 1)
Part Number: 12577588
$64.07 MSRP: $120.90
You Save: $56.83 (48%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Front Oxygen Sensor, Oxygen Sensor
- Replaces: 24577273
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2003 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12604913
$46.11 MSRP: $95.74
You Save: $49.63 (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 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L, 8 Cyl 6.0L
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12604538
$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; Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 Chevrolet Trailblazer | 4 DOOR | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer 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
ADD TO CART
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:
- 2005 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L
View related parts
Chevrolet Trailblazer Sensor,Heated Oxygen(Position 2)
Part Number: 12604575
$87.66 MSRP: $182.02
You Save: $94.36 (52%)
Ships in 1-3 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 Trailblazer | 4 DOOR | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer Sensor,Heated Oxygen(Position 1)
Part Number: 12592591
$42.36 MSRP: $79.91
You Save: $37.55 (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:
- 2006-2009 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer Sensor,Heated Oxygen(Position 1)
Part Number: 12586996
$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
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2005 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer Sensor,Heated Oxygen(Position 2)
Part Number: 12585999
$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, Rear Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
View related parts
Chevrolet Trailblazer 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:
- 2006 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L, 8 Cyl 6.0L
View related parts
Chevrolet Trailblazer Sensor,Heated Oxygen(Position 2)
Part Number: 12567127
$34.59 MSRP: $111.28
You Save: $76.69 (69%)
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:
- 2003-2004 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12573167
$48.29 MSRP: $100.28
You Save: $51.99 (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:
- 2005 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L
View related parts
Chevrolet Trailblazer Sensor Assembly, Htd Oxy (Post, Catalyst Bank 1
Part Number: 12681390
$39.48 MSRP: $70.82
You Save: $31.34 (45%)
Ships in 1-3 Business Days
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 Trailblazer | 4 DOOR EXT | 3 Cyl 1.3L
View related parts
Chevrolet Trailblazer Sensor Assembly, Htd Oxy(Pre, Catalyst Bank 1 Se
Part Number: 55506886
$61.38 MSRP: $110.10
You Save: $48.72 (45%)
Ships in 1-3 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 Trailblazer | 4 DOOR EXT | 3 Cyl 1.2L
View related parts
Chevrolet Trailblazer Sensor Assembly, Htd Oxy(Pre, Catalyst Bank 1 Se
Part Number: 55503721
$30.39 MSRP: $50.30
You Save: $19.91 (40%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Lower Oxygen Sensor, Oxygen Sensor
- Replaced by: 25203197
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Trailblazer | 4 DOOR EXT | 3 Cyl 1.2L
View related parts
Chevrolet Trailblazer Sensor Assembly, Htd Oxy(Pre, Catalyst Bank 1 Se
Part Number: 12695629
$44.39 MSRP: $69.84
You Save: $25.45 (37%)
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 Trailblazer | 4 DOOR EXT | 3 Cyl 1.3L
View related parts
Chevrolet Trailblazer 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:
- 2006-2007 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L, 8 Cyl 6.0L
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen
Part Number: 12567163
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:
- 2003-2004 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 3)
Part Number: 12612506
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 Trailblazer | 4 DOOR | 8 Cyl 5.3L, 8 Cyl 6.0L

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Chevrolet Trailblazer Oxygen Sensor Parts Questions & Experts Answers

Sensor,Heated Oxygen(Position 2)
12585999
Q: What are the guidelines for replacing oxygen sensors in Chevrolet Trailblazer?
A: There are two oxygen sensors in all models namely; a pre-converter O2 sensor and post-converter O2 sensor. This O2 sensor measures the amount of oxygen left in the combustion process' exhaust gas and produces a voltage that changes with the amount of oxygen. The PCM constantly receives voltage signals from the pre-converter O2 sensor to determine the necessary fuel injector pulse width and keep an air-fuel ratio at 14.7:1. On the other hand, post-converter oxygen sensor does not affect control of air/fuel ratio by PCM, but it is instrumental in monitoring catalyst converter efficiency. In case of any problem with an oxygen sensor, the PCM can identify this and set diagnostic difficulty codes specific for each malfunction. To replace an oxygen sensor such as avoiding detaching pigtail or electrical connector, keeping away contaminants from sensors, using anti-freeze compound on thread and not utilizing cleaning solvents which should be followed strictly. It is possible to replace the sensor without raising the vehicle regarding preconverter sensor while with post converter one it calls for lifting vehicle up and placing on jackstands firmly. Consequently, it is advisable to undo electrical connection through suitable wrench or specialized oxgen socket so as to unscrew this socket by the same tool recommended for it. Apply anti-seize compound before making sure that you have tighten that thing well prior to attaching electrical connector then slowly lowering down a car at last.

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