How to Replace the Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 on Chevrolet Blazer?

The replacement of Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 begins with vehicle elevation. First disconnect the HO2S's connector then use the Oxygen Sensor Wrench Tool (J 39194-B) to remove the sensor (HO2S). New and service replacement sensor threads should receive protection by a layer of anti-seize compound GM P/N 5613695 when necessary. This compound contains liquid graphite and glass beads. You must install the sensor using the Oxygen Sensor Wrench (J 39194-B), reaching a torque level of 42 N.m (31 lb ft). Finish the repair by attaching the HO2S harness connector then drop the vehicle back to the floor.

OEM Chevrolet Blazer Oxygen Sensor

Oxygen O2 Sensor

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13 Oxygen Sensors found

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Chevrolet Blazer Oxygen Sensor Part Number: 19178938
$63.56 MSRP: $129.10
You Save: $65.54 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaces: 25165314, 25161152, 25312185
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994 Chevrolet Blazer | Base, Silverado, Silverado Sport | 8 Cyl 5.7 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 55489474
$35.52 MSRP: $72.13
You Save: $36.61 (51%)
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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:
- 2020-2024 Chevrolet Blazer | LT, Premier, RS | 4 Cyl 2.0 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 12667438
$41.72 MSRP: $84.74
You Save: $43.02 (51%)
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Product Specifications
- Other Name: Sensor Assembly-Heated Oxygen (Pre-Catalyst Bank 2 S; Rear Oxygen Sensor; Front Oxygen Sensor; Upper Oxygen Sensor; Lower Oxygen Sensor; Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2024 Chevrolet Blazer | Base, LT, Premier, RS | 6 Cyl 3.6 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 19178930
$66.41 MSRP: $134.88
You Save: $68.47 (51%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor
- Replaces: 25312184, 25165313, 25171579
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 Chevrolet Blazer | Base, LT | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 19178918
$80.06 MSRP: $142.96
You Save: $62.90 (44%)
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Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaces: 25163079, 25312200
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1996-2002 Chevrolet Blazer | Base, LS, LT, Trailblazer, Xtreme | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 12643707
$44.51 MSRP: $67.06
You Save: $22.55 (34%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Front Oxygen Sensor; Upper Oxygen Sensor
- Replaces: 12627139
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 Chevrolet Blazer | Base, L, LT | 4 Cyl 2.5 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 12559850
$59.96 MSRP: $121.78
You Save: $61.82 (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:
- 2002 Chevrolet Blazer | LS, Xtreme | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 12718669
$34.37 MSRP: $69.81
You Save: $35.44 (51%)
Ships in 1-3 Business Days
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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:
- 2020-2024 Chevrolet Blazer | LT, Premier, RS | 4 Cyl 2.0 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 25176708
$60.12 MSRP: $112.89
You Save: $52.77 (47%)
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Product Specifications
- Other Name: Sensor Assembly, Oxygen; Sensor, Computer Control Sensors
- Replaces: 10096129
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1993 Chevrolet Blazer | Cheyenne, Silverado | 8 Cyl 5.7 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 19178959
$58.38 MSRP: $118.58
You Save: $60.20 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Replaces: 25165312, 25312179
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1995 Chevrolet Blazer | Base | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 12661898
$63.01 MSRP: $127.99
You Save: $64.98 (51%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors; Rear Oxygen Sensor; Lower Oxygen Sensor
- Replaces: 12643903
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2019-2021 Chevrolet Blazer | Base, L, LT | 4 Cyl 2.5 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 12567254
$55.86 MSRP: $113.46
You Save: $57.60 (51%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Computer Control Sensors
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2005 Chevrolet Blazer | Base, LS, Xtreme, ZR2 | 6 Cyl 4.3 L GAS
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Chevrolet Blazer Oxygen Sensor Part Number: 19211437
$19.00 MSRP: $33.92
You Save: $14.92 (44%)
Product Specifications
- Other Name: Sensor, Computer Control Sensors; Sensor, Emission Control Sensor(Vehicle Speed); Sensor, Emission Control Sensor(Oxygen)
- Replaces: 19178952, 25171573, 25166816, 25171574, 25162693, 25106073, 25107378, 25165118, 25171581, 25132068, 25165120, 25162600, 19178953, 19178943, 25133185, 25133076, 19178919, 25162753
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1992-1994 Chevrolet Blazer | Base, Cheyenne, Silverado, Silverado Sport | 8 Cyl 5.7 L GAS, 8 Cyl 6.5 L DIESEL

Chevrolet Blazer Oxygen Sensor

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The Oxygen Sensor in Chevrolet Blazer is used to determine the amount of unburned oxygen in exhaust emissions; this is very important in determining the correct ratio of air and fuel that should be mixed and burned in the engines. It produces a voltage that is proportional to the oxygen concentration and the engine control computer uses it in timing the fuel injectors. This feedback mechanism allows the engine to be a 'closed loop,' and as such improves catalytic converter effectiveness. In Chevrolet Blazers, there is usually the zirconium dioxide based oxygen sensor, and there may be the upstream and downstream oxygen sensors. The upstream sensor gives the car's computer a real-time reading adequate for air-fuel mixture tweaking, while the downstream sensor keeps a lookout on the efficiency of the catalytic converter. Modern vehicles may also have air-fuel ratio sensors, which are wider in usage range than the usual narrow band oxygen sensors. These sensors can wear out with time due to contamination and therefore the emissions may increases and the fuel consumption decreases.

Chevrolet Blazer Oxygen Sensor Parts and Q&A

Oxygen Sensor
12567254
Q: How to Replace the Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 on Chevrolet Blazer?
A:
The replacement of Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1 begins with vehicle elevation. First disconnect the HO2S's connector then use the Oxygen Sensor Wrench Tool (J 39194-B) to remove the sensor (HO2S). New and service replacement sensor threads should receive protection by a layer of anti-seize compound GM P/N 5613695 when necessary. This compound contains liquid graphite and glass beads. You must install the sensor using the Oxygen Sensor Wrench (J 39194-B), reaching a torque level of 42 N.m (31 lb ft). Finish the repair by attaching the HO2S harness connector then drop the vehicle back to the floor.