Installation Procedure

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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.

Fig 1: View Of Catalytic Converter Assembly HO2S's

Courtesy of GENERAL MOTORS COMPANY

CAUTION:

Refer to Component Fastener Tightening Caution .

If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
Install the HO2S (3) and tighten to 42 N.m (31 lb ft).

Fig 2: View Of Engine Wiring Harness Electrical Connectors, (CPA) Retainers & Engine Harness Clips

Courtesy of GENERAL MOTORS COMPANY

Connect the HO2S electrical connector (7) to the engine wiring harness electrical connector (1).
Install the CPA retainer (2).
Install the HO2S clip (8) to the engine wiring harness.
Install the right wheelhouse liner. Refer to Front Wheelhouse Liner Replacement - Right Side .