GM 12578624
Oxygen Sensor

The replacement of heated Oxygen Sensor (HO2S) 2 requires a vehicle lift and supportive base. The Engine Wiring Harness Connector needs its ho2s electrical connector removed. Remove the ho2s from its Catalytic Converter position by using the heated Oxygen Sensor wrench (J 39194-B). Before installing an ho2s you must apply special anti-seize compound on its threads because this compound consists of graphite suspended in fluid and glass beads. The threads of the same sensor should receive anti-seize compound before a new installation occurs. Before installation apply anti-seize compound p/n 5613695 (or equivalent) on the ho2s threads. Place the ho2s into the Catalytic Converter and use heated Oxygen Sensor wrench (J 39194-B) to tighten its threads to 42 n.m (31 lb ft). To complete the installation connect the ho2s electrical connector to the Engine Wiring Harness Connector before lowering the vehicle. Using a scan tool to perform a code clear reset of the ho2s resistance learned value is essential to avoid ho2s failure but failure to do so will result in an ho2s failure.

Coat the threads with anti-seize compound (P/N 5613695) or an equivalent if necessary.

Perform a code clear with a scan tool.

Raise and support the vehicle.

Install the HO2S 2 and use the Heated Oxygen Sensor Wrench (J 39194-B) to tighten the sensor to 41 N.m (30 lb ft).

The necessary tool is the Oxygen Sensor Wrench (J 39194-C).

Use the Oxygen Sensor Wrench (J 39194) to carefully remove the HO2S.

First, disconnect the heated oxygen sensor (HO2S) electrical connector.

Connect the HO2S electrical connector and lower the vehicle.

Remove the HO2S using the Heated Oxygen Sensor Wrench (J 39194-B).

Using the Heated Oxygen Sensor Wrench (J 39194-B), install the HO2S into the exhaust manifold, tightening it to 42 N.m (31 lb ft).

Coat the threads of the new HO2S with anti-seize compound (P/N 5613695).