Oxygen Sensor: Service and Repair

REMOVAL PROCEDURE

Tools Required
J 39194 Heated Oxygen Sensor Wrench

NOTE: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

IMPORTANT: Removal of the oxygen sensor is easier when the engine temperature is above 48°C (120°F).

1. Turn OFF the ignition.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
3. Disconnect the sensor harness connector.

IMPORTANT: Replace sensors only. Do not attempt to repair any sensors.

4. Remove the effected oxygen sensors using the J 39194 heated oxygen sensor wrench.
^ Bank 1 sensor 2 (1)
^ Bank 1 sensor 1 (2)
^ Bank 2 sensor 1 (3)
^ Bank 2 sensor 2 (4)

INSTALLATION PROCEDURE

IMPORTANT: A special anti-seize compound is used on the oxygen sensor threads. The new service sensors should have the compound already applied to the threads. Coat the threads of a reused sensor with anti-seize compound GM P/N 5613695 or the equivalent.

NOTE: Refer to Component Tightening Notice in Service Precautions.

1. Install the new oxygen sensors.

Tighten
Tighten the heated oxygen sensors to 30 N.m (22 lb ft).
^ Bank 1 Sensor 2 (1)
^ Bank 1 Sensor 1 (2)
^ Bank 2 Sensor 1 (3)
^ Bank 2 Sensor 2 (4)

IMPORTANT: The harness must not contact any of the hot exhaust components. The rear Heated Oxygen Sensor (HO2S) pigtail has white tape at the intervals, indicating the proper location of each retaining clip. When connecting the sensor pigtail to the harness ensure that the connector seal is crushed uniformly all the way around between the connectors.

2. Connect the sensor harness connector.
3. Lower the vehicle.