Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1

HEATED OXYGEN SENSOR (HO2S) REPLACEMENT BANK 1 SENSOR 1

REMOVAL PROCEDURE




1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. If necessary, unbolt the front propeller shaft from the front differential.
3. Disconnect the connector position assurance (CPA) retainer.

NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice in Service Precautions.

4. Remove the heated oxygen sensor (HO2S) electrical connector from the fuel line clip.
5. If equipped with a 4.8L or 5.3L engine, disconnect the HO2S electrical connector (1).




6. If equipped with a 6.0L engine, disconnect the HO2S electrical connector (1).




7. Remove the HO2S.

NOTE: Refer to Excessive Force and Oxygen Sensor Notice in Service Precautions.

INSTALLATION PROCEDURE

IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.




1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.

NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.

2. Install the HO2S.

Tighten the sensor to 42 N.m (31 lb ft).




3. If equipped with a 6.0L engine, connect the HO2S electrical connector (1).




4. If equipped with a 4.8L or 5.3L engine, connect the HO2S electrical connector (1).
5. Install the HO2S electrical connector to the fuel line clip.
6. Disconnect the CPA retainer.
7. If necessary, bolt the front propeller shaft to the front differential.
8. Lower the vehicle.