How to replace the Heated Oxygen Sensor (HO2S) on Chevrolet Trailblazer?

First step to replace the Heated Oxygen Sensor (HO2S) requires removal of the connector position assurance (CPA) retainer from HO2S connection along with disconnecting the engine wiring harness electrical connector from HO2S electrical connector. Before proceeding to the second step you must remove the HO2S electrical connector clip which is located at the transmission fluid fill tube bracket. Remove the HO2S through the J 39194-B if needed. The threads of an existing sensor require P/N 12377953 anti-seize compound if reinstallation occurs because this compound helps with later extraction. The J 39194-B should be used to install the HO2S and the torque should be set to 42 Nm (31 lb ft). The installation process begins by mending the engine wiring harness electrical connector to the HO2S electrical connector and finishing with the CPA retainer installation to the HO2S connection.

OEM Chevrolet Trailblazer Oxygen Sensor

Oxygen O2 Sensor

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18 Oxygen Sensors found

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Chevrolet Trailblazer Oxygen Sensor Part Number: 12573721
$63.75 MSRP: $129.48
You Save: $65.73 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004 Chevrolet Trailblazer | LS, LT, North Face | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12592591
$39.35 MSRP: $79.91
You Save: $40.56 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2009 Chevrolet Trailblazer | Base, LS, LT | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 19209808
$72.40 MSRP: $147.04
You Save: $74.64 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; 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:
- 2006 Chevrolet Trailblazer | LS, LT | 8 Cyl 5.3 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12604575
$93.88 MSRP: $190.68
You Save: $96.80 (51%)
Ships in 1-3 Business Days
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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:
- 2008-2009 Chevrolet Trailblazer | Base, LT | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12586996
$84.49 MSRP: $171.60
You Save: $87.11 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor; Front Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005 Chevrolet Trailblazer | LS, LT | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12585999
$93.88 MSRP: $190.68
You Save: $96.80 (51%)
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:
- 2006-2007 Chevrolet Trailblazer | LS, LT | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12578624
$84.49 MSRP: $171.60
You Save: $87.11 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor; Front Oxygen Sensor
- Replaces: 24577303
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2005 Chevrolet Trailblazer | LS, LT, LTZ, North Face | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12577588
$39.80 MSRP: $124.16
You Save: $84.36 (68%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor
- Replaces: 24577273
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2003 Chevrolet Trailblazer | LS, LT, LTZ, North Face | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 25203197
$33.18 MSRP: $52.69
You Save: $19.51 (38%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Lower Oxygen Sensor
- Replaces: 55503721
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | L, LS, LT | 3 Cyl 1.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12695629
$47.88 MSRP: $78.88
You Save: $31.00 (40%)
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Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Pre-Catalyst Bank 1 Se; Upper Oxygen Sensor; Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | ACTIV, LS, LT, RS | 3 Cyl 1.3 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 55506886
$62.05 MSRP: $112.30
You Save: $50.25 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Pre-Catalyst Bank 1 Se; Upper Oxygen Sensor; Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | L, LS, LT | 3 Cyl 1.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 19209805
$85.68 MSRP: $174.02
You Save: $88.34 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor
- Replaces: 12581346, 12590750, 19256730, 19210712
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 Chevrolet Trailblazer | LS, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12681390
$40.58 MSRP: $76.20
You Save: $35.62 (47%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor, Computer Control Sensors; Lower Oxygen Sensor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | ACTIV, LS, LT, RS | 3 Cyl 1.3 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 19209816
Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor
- Replaces: 12611870, 12600893
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 Chevrolet Trailblazer | LS, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Oxygen Sensor Part Number: 12590749
Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Position 2); Front Oxygen Sensor; Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2009 Chevrolet Trailblazer | Base, LS, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Rear Oxygen Sensor Part Number: 12604538
$104.69 MSRP: $186.94
You Save: $82.25 (44%)
Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Position 2); Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 Chevrolet Trailblazer | LS, LT | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Oxygen Sensor, Driver Side Part Number: 12612506
Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Position 3); Rear Oxygen Sensor; Sensor, Computer Control Sensors
- Position: Driver Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2009 Chevrolet Trailblazer | Base, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Oxygen Sensor, Passenger Side Part Number: 12609477
Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Position 3); Rear Oxygen Sensor; Sensor, Computer Control Sensors
- Position: Passenger Side
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2009 Chevrolet Trailblazer | Base, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS

Chevrolet Trailblazer Oxygen Sensor

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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.

Chevrolet Trailblazer Oxygen Sensor Parts and Q&A

Oxygen Sensor
12592591
Q: How to replace the Heated Oxygen Sensor (HO2S) on Chevrolet Trailblazer?
A:
First step to replace the Heated Oxygen Sensor (HO2S) requires removal of the connector position assurance (CPA) retainer from HO2S connection along with disconnecting the engine wiring harness electrical connector from HO2S electrical connector. Before proceeding to the second step you must remove the HO2S electrical connector clip which is located at the transmission fluid fill tube bracket. Remove the HO2S through the J 39194-B if needed. The threads of an existing sensor require P/N 12377953 anti-seize compound if reinstallation occurs because this compound helps with later extraction. The J 39194-B should be used to install the HO2S and the torque should be set to 42 Nm (31 lb ft). The installation process begins by mending the engine wiring harness electrical connector to the HO2S electrical connector and finishing with the CPA retainer installation to the HO2S connection.