Sierra 2500 4WD V8-6.0L (2008)
1. Raise and support the vehicle. Refer to Vehicle Lifting.
2. Remove the connector position assurance (CPA) retainer (1).
3. Disconnect the HO2S electrical connector from the engine wiring harness electrical connector (3).
Notice: Refer to Excessive Force and Oxygen Sensor Notice.
4. Remove the HO2S (4).
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.
