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 Asm,Heated Oxygen (Position 3)
Part Number: 19209808
$50.94 MSRP: $105.76
You Save: $54.82 (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: 12575389, 19256731, 25333812, 12583806, 19210711, 12573168
- 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
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Chevrolet Trailblazer Sensor,Heated Oxygen(Position 2)
Part Number: 12578624
$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
- 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
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Chevrolet Trailblazer Sensor,Heated Oxygen(Position 2)
Part Number: 12604575
$90.03 MSRP: $186.94
You Save: $96.91 (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 2)
Part Number: 12585999
$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:
- 2006 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
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Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12590749
$29.68 MSRP: $95.51
You Save: $65.83 (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
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Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 2)
Part Number: 12604913
$47.35 MSRP: $98.32
You Save: $50.97 (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,Heated Oxygen(Position 1)
Part Number: 12586996
$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
- 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 Assembly, Heated Oxygen (Position 2)
Part Number: 12604538
$99.08 MSRP: $186.94
You Save: $87.86 (47%)
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,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: 12577588
$65.79 MSRP: $124.16
You Save: $58.37 (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 Asm,Heated Oxygen (Position 3)
Part Number: 19209805
$79.82 MSRP: $165.74
You Save: $85.92 (52%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: SENSOR, Computer Control Sensors; Oxygen Sensor, Rear Oxygen Sensor
- Replaces: 12581346, 12590750, 19256730, 19210712
- 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: 12573167
$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; 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,Heated Oxygen(Position 2)
Part Number: 12567127
$35.53 MSRP: $114.28
You Save: $78.75 (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, Htd Oxy(Pre, Catalyst Bank 1 Se
Part Number: 12695629
$45.58 MSRP: $71.72
You Save: $26.14 (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:
- 2021-2025 Chevrolet Trailblazer | 4 DOOR EXT, LEVEL II 4 DOOR EXTENDED, LEVEL III 4DOOR EXTENDED, LEVEL IV 4 DOOR EXTENDED, LEVEL V 4 DOOR EXTENDED | 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:
- 2021-2025 Chevrolet Trailblazer | 4 DOOR EXT, LEVEL II 4 DOOR EXTENDED, LEVEL III 4DOOR EXTENDED | 3 Cyl 1.2L
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Chevrolet Trailblazer SENSOR ASM-HTD OXY
Part Number: 25203197
$31.97 MSRP: $50.30
You Save: $18.33 (37%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Lower Oxygen Sensor, Oxygen Sensor
- Replaces: 55503721
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2025 Chevrolet Trailblazer | 4 DOOR EXT, LEVEL II 4 DOOR EXTENDED, LEVEL III 4DOOR EXTENDED | 3 Cyl 1.2L
View related parts
Chevrolet Trailblazer Sensor Assembly, Htd Oxy (Post, Catalyst Bank 1
Part Number: 12681390
$40.55 MSRP: $72.74
You Save: $32.19 (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:
- 2021-2025 Chevrolet Trailblazer | 4 DOOR EXT, LEVEL II 4 DOOR EXTENDED, LEVEL III 4DOOR EXTENDED, LEVEL IV 4 DOOR EXTENDED, LEVEL V 4 DOOR EXTENDED | 3 Cyl 1.3L
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
View related parts
Chevrolet Trailblazer Sensor Assembly, Heated Oxygen (Position 3)
Part Number: 12609477
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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1-20 of 21 Results

Chevrolet Trailblazer Oxygen Sensor

To summarize, the Oxygen Sensor in Chevrolet Trailblazer cars is responsible to measure the air / fuel blending ratio in the engine exhaust to achieve modified performance and lowered discharge. The sensor depends on the difference between the unburned oxygen and the atmospheric level to create an electrical voltage useful to the engine control computer to make the necessary alterations. This feedback loop runs in the 'closed loop' manner in order to achieve peak performance of the catalytic converter. Trailblazer vehicles generally have at least 2 oxygen sensors, one before the catalytic converter and the other, after the converter, although the primary feedback O2 sensor is the one located before the converter. Today's conventional sensors employ zirconium dioxide technology; however, there could be a number of newer models with air/fuel ratio sensors inclusive of range. Some parameters like contaminants and age of these sensors may affect the general performance of the sensors and hence increase emission levels and decrease fuel economy hence, the need to service such sensors in order to have efficient running of vehicles.

Each OEM Chevrolet Trailblazer Oxygen Sensor we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

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.

Related Chevrolet Trailblazer Parts

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