Heated Oxygen Sensor (HO2S) Replacement - Bank 2

NOTE: Refer to HO2S Pigtail Notice in Cautions and Notices.

IMPORTANT: Take care when handling the Heated Oxygen Sensor (HO2S). The in-line electrical connector and louvered end must be kept free of grease, dirt or other contaminants. Also, avoid using cleaning solvents of any type. Do not drop or roughly handle the heated oxygen sensor. A dropped sensor is a faulty sensor.

REMOVAL PROCEDURE

NOTE: Refer to Oxygen Sensor Removal in Cautions and Notices.

Excessive force may damage the threads in the exhaust pipe. It may be necessary to lower the exhaust system in order to gain sufficient access to an HO2S and/or the connector.




1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
2. Determine the location of the HO2S to be removed. Refer to Engine Controls Component Views.
3. Disconnect the HO2S electrical connector.




4. Carefully remove the HO2S.

INSTALLATION PROCEDURE

IMPORTANT: A special anti-seize compound is used on the heated oxygen sensor threads. The compound consists of graphite suspended in fluid and glass beads. The graphite burns away, but the glass beads remain, making the sensor easier to remove. New sensors service sensors already have the compound applied to the threads. If a sensor is removed from an engine and is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.




1. Coat the threads of the heated oxygen sensor with anti-seize compound GM P/N 5613695 or the equivalent if, necessary.

NOTE: Refer to Fastener Notice in Cautions and Notices.

2. Install the heated oxygen sensor.

Tighten
Tighten the HO2S to 41 N.m (30 lb ft).




3. Connect the HO2S electrical connector.
4. Lower the vehicle.