GM 12616125
Oxygen Sensor

First to replace the heated Oxygen Sensor-bank 1 sensor 2 one should raise and support the vehicle. Take out the connector position assurance (CPA) retainer and disconnect the heated Oxygen Sensor (HO2S) electrical connector from the engine wiring harness electrical connector. Next, take the ho2s out of the Exhaust Pipe. When installing if it is a reinstallation of the old sensor, coat the threads with anti-seize compound gm p/n 12377953 or equivalent since a special anti-seize compound consisting of liquid graphite and glass beads are used in the ho2s threads to make future removal easy. Mount the ho2s to the Exhaust Pipe and fasten it at 42 nm (31 lb ft). Next, attach the ho2s electromotive connector 2 to the engine wire harness electromotive connector 1, followed by installation of the cpa retainer 1 before lowering the vehicle.

The vehicle needs to be securely raised while keeping it in position for heated Oxygen Sensor (HO2S) for bank 1 sensor 1 replacement. Use a wrench to remove the retainer between the ho2s electrical connector and engine wiring harness electrical connector and disconnect both components from each other. The Exhaust Manifold should receive the removal of ho2s. Anti-seize compound gm p/n 12377953 or its equivalent should be used to coat the threads during installation when using an existing sensor because ho2s threads contain a unique compound of liquid graphite with glass beads which helps future sensor removal. Fit the ho2s onto the Exhaust Manifold while using a torque of 42 nm (31 lb ft). Together with engine wiring harness attach the connector to the ho2s electrical connector before fastening the engine wiring harness clip to the ho2s electrical connector retainer. Finally, lower the vehicle.

Coat the threads with anti-seize compound GM P/N 12377953 or an equivalent.

Lower the vehicle.

Reconnect the HO2S electrical connector to the engine wiring harness electrical connector and install the CPA retainer before lowering the vehicle.

Remove the connector position assurance (CPA) retainer and disconnect the HO2S electrical connector from the engine wiring harness electrical connector.