Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 2

REMOVAL PROCEDURE
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.




2. Remove the connector position assurance (CPA) retainer.

NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions.

3. Disconnect the heated oxygen sensor (HO2S) electrical connector.




4. Remove the HO2S (2).

NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions.

INSTALLATION PROCEDURE

IMPORTANT: 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.




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

NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.

2. Install the HO2S (2).

Tighten
Tighten the sensor to 42 N.m (31 lb ft).




3. Connect the HO2S electrical connector.
4. Install the CPA retainer.
5. Lower the vehicle.