Oxygen Sensor: Service and Repair

Oxygen Sensor (O2S):

NOTE: The Oxygen Sensor (02S) uses a permanently attached pigtail and connector. This pigtail should not be removed from the 02S. Damage or removal of the pigtail or connector could affect proper operation of the oxygen sensor.

CAUTION: Take care when handling the 02S. 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
CAUTION: The 02S may be difficult to remove, when engine temperature is below 48°C (120°F). Excessive force may damage threads in exhaust manifold or exhaust pipe.

1. Negative battery cable.
2. Electrical connector releasing locking tab.
3. Carefully back out oxygen sensor.

INSTALL OR CONNECT
NOTE: A special anti-seize compound is used on the 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.

1. Coat threads of oxygen sensor with anti-seize compound (GM PIN 5613695 or equivalent), if necessary.
2. Sensor and torque to 41 Nm (30 lb. ft.).
3. Electrical connector.
4. Negative battery cable.