Tools Required

J 39194-B Oxygen Sensor Wrench

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

Notice: Refer to Heated Oxygen and Oxygen Sensor Notice in the Preface section.




2. Disconnect the connector (1) for the heated oxygen sensor (HO2S).

Notice: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.

3. Using the J 39194-B , remove the HO2S (2).

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 engine and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. Coat the threads of the oxygen sensor with anti-seize compound GM P/N 5613695, if necessary.

Notice: Refer to Component Fastener Tightening Notice in the Preface section.




2. Using the J 39194-B , install the HO2S (2).

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

3. Connect the HO2S harness connector (1).
4. Lower the vehicle.