Sierra 1500 4WD V8-6.0L (2007)
18. If the left catalytic converter is being replaced, remove the HO2S (1 and 4).
Installation Procedure
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 the anti-seize compound applied before the reinstallation.
Notice: Refer to Fastener Notice.
1. If the left catalytic converter was replaced, perform the following steps:
1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953 or equivalent.
2. Install the HO2S (1 and 4).
Tighten the sensors to 42 N.m (31 lb ft).
