Oxygen Sensor: Service and Repair

Note:
- The oxygen sensor has a permanently attached pig-tail and connector. This pig-tail should not be removed, since removal will affect proper operation of the oxygen sensor.
- Take care when handling the Oxygen Sensor (O2S). The in-line electrical connector and louvered end must be kept free of grease, dirt, or other contaminants. Also, avoid using cleaning solvents of any type. Do not drop or roughly handle the oxygen sensor.

Remove or Disconnect:
^ The oxygen sensor may be difficult to remove when engine temperature is below 48° C (120° F). Use caution, since excessive force may damage threads in exhaust manifold or pipe.
- Disconnect negative battery cable.
- Disconnect electrical connector releasing locking tab.
- Using suitable wrench, carefully back out sensor.

Install or Connect:

Important
^ A special anti-seize compound is used on the Oxygen Sensor (02S) threads. The compound consists of liquid graphite and glass beads. The graphite will tend to burn away, but the glass beads will remain, making the sensor easier to remove.
^ New, or service replacement sensors will already have the compound applied to the threads. If a sensor is removed from an engine, and if for any reason it is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.

- Coat threads of oxygen sensor with anti-seize compound (GM P/N 5613695 or equivalent), if necessary.
- Install and torque oxygen sensor to 41 N-m (30 lb.ft.).
- Reconnect electrical connector.
- Reconnect negative battery cable