Avalanche 2500 2WD V8-8.1L VIN G (2002)
Oxygen Sensor: Service and Repair
Heated Oxygen Sensor (HO2S) Replacement Bank 1 Sensor 1
REMOVAL PROCEDURE
IMPORTANT: The HO2S may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage the threads
in the exhaust manifold or exhaust pipe. It may be necessary to lower the exhaust system to gain sufficient access to a HO2S and/or a HO2S
connector.
1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the HO2S electrical connector (2).
3. Carefully back out the HO2S (1).
INSTALLATION PROCEDURE
IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of graphite suspended in fluid and glass beads.
The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the
compound applied to the threads. If a sensor is removed from an engine, and if for any reason a sensor is to be reinstalled, the threads must have
anti-seize compound applied before reinstallation.
