Envoy 2WD V8-5.3L VIN M (2005)
1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
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.
NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.
2. Install the HO2S (2).
Tighten the sensor to 42 N.m (31 lb ft).
3. Connect the HO2S electrical connector (1).
4. Install the CPA retainer.
5. Lower the vehicle.
