GM 12609457
Oxygen Sensor

To replace the Heated Oxygen Sensor - Bank 1 Sensor 2, you would first have to lift and support the vehicle. If for the 2 wheel drive (2WD) models, then remove the connector position assurance (CPA) retainer to disconnect the HO2S electrical connector from the engine wiring harness electrical connector. Skip for 4 wheel drive (4WD) vehicles. The CPA retainer needs to be removed along with the HO2S electrical connector that should be disconnected from the engine wiring harness electrical connector. Carefully remove the HO2S. When installing the old sensor, the threads should be coated with anti-seize compound GM P/N12377953 or equivalent, since special anti-seize compound is used on the HO2S threads in order to facilitate future removal. Install the HO2S and tighten it to 42 Nm (31 lb ft). In case of 4WD models, connect the HO2S electrical connector to the engine wiring harness electrical connector and install the CPA retainer. Then link the HO2S electrical connector to the engine wiring harness electrical connector and replace the CPA retainer again. Finally, lower the vehicle.

Vehicle elevation and support starts the procedure of Heated Oxygen Sensor - Bank 2 Sensor 2 replacement. First disconnect the HO2S electrical connector from the engine wiring harness electrical connector along with the removal of the connector position assurance (CPA) retainer. Carefully remove the HO2S . The use of anti-seize compound GM P/N 12377953 or equivalent is recommended to coat sensor threads when reusing the same sensor because the HO2S threads require a special liquid graphite and glass bead blend that makes future uninstallations easier. Affix the HO2S and fasten it to a torque of 42 Nm (31 lb ft). The vehicle section requires installation of the CPA retainer after connecting the HO2S electrical connector to the engine wiring harness electrical connector.

Tighten it to 42 N.m (31 lb ft).

First, raise and support the vehicle.

Unbolt the front propeller shaft from the front differential.

Install the HO2S to the catalytic converter and tighten it to 40 Nm (30 lb ft).

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

Reattach the HO2S pigtail electrical connector clip to the frame, connect the engine wiring harness electrical connector to the HO2S pigtail electrical connector, and secure the CPA retainer.

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

It facilitates easier removal.

A special anti-seize compound, consisting of liquid graphite and glass beads.

Tighten it to 42 N.m (31 lb ft).

Remove the HO2S clip from the engine wiring harness clip and then remove the HO2S.

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

Remove the HO2S electrical connector clip from the engine harness clip and then remove the HO2S.

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

Install the HO2S electrical connector clip to the fuel line clip, connect the engine wiring harness electrical connector to the HO2S, and install the CPA retainer.

Apply anti-seize compound GM P/N 12377953, or equivalent.