Avalanche 4WD V8-5.3L (2011)
4. Remove the HO2S (2).
Installation Procedure
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.
Caution: Refer to Component Fastener Tightening Caution See: Service Precautions/Vehicle Damage Warnings/Component Fastener
Tightening Caution.
2. Install the HO2S (2) and tighten to 42 Nm (31 lb ft).
3. Connect the HO2S electrical connector to the engine wiring harness electrical connector (1).
