GM 12589321
Oxygen Sensor

Begin Heated Oxygen Sensor (HO2S) for Bank 2 Sensor 1 replacement in 1500 Series vehicles by raising the vehicle and supporting it for work. Detach the HO2S electrical connector from its position with the engine wiring harness electrical connector . Also remove the connector position assurance (CPA) retainer. The procedure continues with removal of the HO2S clip from the engine wiring harness followed by sensor extraction. Protect sensor connectors by avoiding any harm to the pigtail since damage may result in performance issues. The threads of new or service-replaced sensors should receive application of anti-seize compound GM P/N 12377953 or equivalent material to assist future uninstalls. Use anti-seize compound GM P/N 12377953 or equivalent on the HO2S threads before installation and torque it to 42 N.m (31 lb ft). Return the HO2S electrical connector to connect with the engine wiring harness electrical connector before fastening the CPA retainer and attaching the HO2S clip to the harnesses before lowering the vehicle.

Apply anti-seize compound GM P/N 12377953 to the threads if reinstalling the old sensor.

Carefully remove the HO2S, ensuring not to damage the pigtail or connectors, as this could affect sensor performance.

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.

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

Install the HO2S and tighten it to 42 N.m (31 lb ft).

Tighten the HO2S to 42 Nm (31 lb ft) using the J 39194-B.

Install the HO2S using the J 39194-B and tighten it to 42 Nm (31 lb ft).

Remove the HO2S.

Reconnect the HO2S electrical connector and the CPA retainer, then lower the vehicle.

If necessary, bolt the front propeller shaft back to the front differential.

It consists of liquid graphite and glass beads, which facilitate future removal.

Raise and support the vehicle.

Raise and support the vehicle appropriately.

Disconnect the HO2S electrical connector.

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

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

Raise and support the vehicle.

Reconnect the HO2S electrical connector, install the CPA retainer, secure the HO2S to the harness clip, and finally, lower the vehicle.

Raise and support the vehicle.

Remove the bank 2 HO2S.

Reconnect the HO2S pigtail electrical connector to the engine wiring harness electrical connector, install the CPA retainer, and then lower the vehicle.

42 N.m (31 lb ft).

Reconnect the HO2S pigtail electrical connector to the engine wiring harness electrical connector and install the CPA retainer.

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

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

Remove the HO2S sensor electrical connector from the camshaft cover and use the J 39194-B Heated Oxygen Sensor Wrench to remove the HO2S from the exhaust manifold.

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