How to Replace a Heated Oxygen Sensor 2 on Chevrolet Trailblazer?

Vehicle support and elevation are necessary before commencing Heated Oxygen Sensor 2 replacement. The heated oxygen sensor (HO2S) electrical connector needs removal from the engine wiring harness electrical connector. After using Heated Oxygen Sensor Wrench (J 39194-B) to remove the HO2S the operation is complete. The threads of the sensor require application of the anti-seize compound (P/N 12377953) or equivalent material which functions as a special anti-seize mixture made from liquid graphite and glass beads to ease sensor removal. Tighten the HO2S with the Heated Oxygen Sensor Wrench (J 39194-B) to 42 N.m (31 lb ft) if necessary. Install the HO2S electrical connector onto the engine wiring harness electrical connector before lowering the vehicle.

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: 12590749
$47.03 MSRP: $95.51
You Save: $48.48 (51%)
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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 Oxygen Sensor Part Number: 12592591
$39.35 MSRP: $79.91
You Save: $40.56 (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:
- 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 Rear Oxygen Sensor Part Number: 12604538
$100.18 MSRP: $186.94
You Save: $86.76 (47%)
Ships in 1-2 Business Days
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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 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
$33.63 MSRP: $52.69
You Save: $19.06 (37%)
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
$50.36 MSRP: $78.88
You Save: $28.52 (37%)
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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
$62.89 MSRP: $112.30
You Save: $49.41 (44%)
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
$42.67 MSRP: $76.20
You Save: $33.53 (44%)
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
View related parts
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, 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 Questions & Experts Answers

Oxygen Sensor
12604575
Q: How to Replace a Heated Oxygen Sensor 2 on Chevrolet Trailblazer?
A:
Vehicle support and elevation are necessary before commencing Heated Oxygen Sensor 2 replacement. The heated oxygen sensor (HO2S) electrical connector needs removal from the engine wiring harness electrical connector. After using Heated Oxygen Sensor Wrench (J 39194-B) to remove the HO2S the operation is complete. The threads of the sensor require application of the anti-seize compound (P/N 12377953) or equivalent material which functions as a special anti-seize mixture made from liquid graphite and glass beads to ease sensor removal. Tighten the HO2S with the Heated Oxygen Sensor Wrench (J 39194-B) to 42 N.m (31 lb ft) if necessary. Install the HO2S electrical connector onto the engine wiring harness electrical connector before lowering the vehicle.