How to replace the Heated Oxygen Sensor (HO2S) Sensor 2 on GMC Envoy?

Start the replacement process of Heated Oxygen Sensor (HO2S) Sensor 2 by elevating and supporting the automobile. The engineer must disconnect the HO2S electrical connector attached to the engine wiring harness. The J 39194-B tool needs to be used for HO2S removal. Apply anti-seize compound P/N 12377953 or an equivalent to the threads of the old sensor because this substance composed of liquid graphite and glass beads will make future removal easier. The J 39194-B tool should be used for installing the HO2S if required with proper torque set to 42 Nm (31 lb ft). Reconnect the HO2S electrical connector to the engine wiring harness while performing the final operation of lowering the vehicle.

OEM GMC Envoy Oxygen Sensor

Oxygen O2 Sensor

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15 Oxygen Sensors found

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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy Oxygen Sensor Part Number: 19209808
$72.40 MSRP: $147.04
You Save: $74.64 (51%)
Ships in 1-2 Business Days
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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:
- 2005-2006 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy Oxygen Sensor Part Number: 12578624
$84.49 MSRP: $171.60
You Save: $87.11 (51%)
Ships in 1-2 Business Days
ADD TO CART
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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy 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 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
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GMC Envoy Oxygen Sensor Part Number: 12573167
$54.84 MSRP: $102.98
You Save: $48.14 (47%)
Ships in 1-2 Business Days
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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:
- 2005 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
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GMC Envoy 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 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
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GMC Envoy 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 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
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GMC Envoy 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 GMC Envoy | SLE, SLT | 6 Cyl 4.2 L GAS
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GMC Envoy 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 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
View related parts
GMC Envoy 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 GMC Envoy | Denali | 8 Cyl 5.3 L GAS

GMC Envoy Oxygen Sensor

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The Oxygen Sensor in GMC Envoy vehicles helps in determining the amount of air and fuel mixture that is perfect for the vehicle engine exhaust for efficient running the vehicle and also to minimize emission. Through comparing the concentration of oxygen in exhaust with that of the surrounding environment, such as air, it produces a voltage-signal that reflects the condition of the mixture as either rich or lean. This feedback enables the engine control computer to vary the fueling signal to the fuel injectors appropriately so that maximum catalytic converter activity and least emissions are maintained. The GMC Envoy automobiles generally have a minimum of 2 oxygen sensors, the prior to the catalytic converter one and the following one, to the catalytic converter where the upstream oxygen sensor is the main feedback giving tool. The high temperature sensor has the drawback of degradating with age by contamination and thus leads to high emissions and low fuel consumption. In some newly manufactured cars, it is difficult to obtain an air / fuel ratio sensor rather than an oxygen sensor as the latter has a broader range of air / fuel measurement mixture.

GMC Envoy Oxygen Sensor Parts and Q&A

Oxygen Sensor
12592591
Q: How to replace the Heated Oxygen Sensor (HO2S) Sensor 2 on GMC Envoy?
A:
Start the replacement process of Heated Oxygen Sensor (HO2S) Sensor 2 by elevating and supporting the automobile. The engineer must disconnect the HO2S electrical connector attached to the engine wiring harness. The J 39194-B tool needs to be used for HO2S removal. Apply anti-seize compound P/N 12377953 or an equivalent to the threads of the old sensor because this substance composed of liquid graphite and glass beads will make future removal easier. The J 39194-B tool should be used for installing the HO2S if required with proper torque set to 42 Nm (31 lb ft). Reconnect the HO2S electrical connector to the engine wiring harness while performing the final operation of lowering the vehicle.