Sierra 2500 Denali 2WD V8-6.0L (2011)
9. Disconnect the engine wiring harness electrical connector (3) from the HO2S.
Caution: Refer to Excessive Force and Oxygen Sensor Caution (See: Service Precautions/Excessive Force and Oxygen Sensor Caution)
10. Remove the HO2S (1).
Installation Procedure
Caution: Refer to Component Fastener Tightening Caution (See: Service Precautions/Vehicle Damage Warnings/Component Fastener
Tightening Caution).
Note: 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.
