Sierra Classic 3500 4WD V8-8.1L (2007)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor Replacement - Bank 2 Sensor 2
HEATED OXYGEN SENSOR REPLACEMENT - BANK 2 SENSOR 2
REMOVAL PROCEDURE
NOTE: Refer to Heated Oxygen and Oxygen Sensor Notice.
1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Disconnect the connector position assurance (CPA) retainer.
3. Disconnect the heated oxygen sensor (HO2S) electrical connector.
4. Remove the HO2S (2).
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 will 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 Fastener Notice.
2. Install the HO2S (2).
Tighten the sensor to 42 N.m (31 lb ft).
