GM 12576131
Oxygen Sensor

The replacement process for heated Oxygen Sensor (HO2S) at position 1 begins with disconnecting the Oxygen Sensor electrical connector then removing the ho2s while being mindful not to damage Exhaust Manifold/pipe threads due to avoid applying force beyond necessity. Maintain engine temperature above 48°c (120°F) because it makes removing the items easier. According to procedure, threads of new service sensors already have anti-seize compounds applied but used sensors must receive the application of anti-seize compound p/n 5613695 or any equivalent product. Fasten the ho2s with 1 to 42 n.m torque (31 lb ft) then connect the Oxygen Sensor electrical connector. The procedure demands careful handling of ho2s and o2s while maintaining their electrical connector and louvered end free from dirt and contamination. Also avoid all cleaning solvents as well as dropping sensors.

Ensure the engine temperature is above 48°C (120°F) to facilitate removal.

It is crucial to use a special anti-seize compound on the HO2S threads, which consists of liquid graphite and glass beads.

Disconnect the CPA retainer.

When installing, apply anti-seize compound GM P/N 12377953 to the threads of the old sensor if it is being reinstalled, as new sensors come pre-coated.