Avalanche 2500 4WD V8-8.1L VIN G (2003)
19. Remove the oxygen sensor if the muffler is being replaced.
Installation Procedure
1. If the muffler was replaced reinstall the old oxygen sensor.
2. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensor.
Notice:
Refer to Fastener Notice in Service Precautions.
See: Service Precautions/Vehicle Damage Warnings/Fastener Notice
3. Install the oxygen sensor.
Tighten the oxygen sensor to 42 Nm (31 ft. lbs.).
Important: Apply lubricant to the insulators to aid in installation.
4. Install the insulators to the muffler hangers.
5. Install a new exhaust manifold pipe gasket.
