Heated Oxygen Sensor Replacement - Bank 1 Sensor 1

Heated Oxygen Sensor Replacement - Bank 1 Sensor 1

Removal Procedure

Caution: Refer to Heated Oxygen and Oxygen Sensor Caution (Heated Oxygen and Oxygen Sensor Caution).

Caution: Refer to Excessive Force and Oxygen Sensor Caution (Excessive Force and Oxygen Sensor Caution).

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
2. Unscrew the heated oxygen sensor (HO2S) sensor from the catalytic converter.
3. Remove the connector position assurance (CPA) retainer.




4. Disconnect the HO2S electrical connector (3).

Installation Procedure




1. Connect the HO2S electrical connector (3).
2. Install the CPA retainer.

Note: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

3. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.





Caution: Refer to Component Fastener Tightening Caution (Component Fastener Tightening Caution).

Note: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed into the catalytic converter.

4. Install the HO2S (2). Tighten the sensor to 42 Nm (31 ft. lbs.).
5. Lower the vehicle.