Installation Procedure
WARNING: This page is about a different variant/trim than selected.
NOTE:
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.
- If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
- Install the HO2S (2).
Tighten: Tighten the sensor to 42 N.m (31 lb ft).
- Ensure to route the front HO2S wiring under the rear HO2S electrical connector.
- Connect the HO2S electrical connector (4) to the engine wiring harness electrical connector (3).
- Lower the vehicle.
CAUTION:
Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.