Envoy 2WD V8-5.3L (2007)
1. Connect the HO2S electrical connector (2).
2. Install the CPA retainer.
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.
3. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
Notice: Refer to Component Fastener Tightening Notice.
Important: If the HO2S sensor is connected to the main wiring harness during installation. Rotate the HO2S sensor several turns
counterclockwise before threading the HO2S sensor into the catalytic converter. This action of initially reverse winding of the pigtail
wires will prevent a condition where the HO2S sensor pigtail wires become severely twisted or binding once the HO2S sensor is installed
into the catalytic converter.
4. Install the HO2S (2).
Tighten the sensor to 42 N.m (31 lb ft).
5. Lower the vehicle.
