Installation Procedure

NOTE:

A special anti-seize compound is used in 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 reinstalled, the threads must have anti-seize compound applied before the reinstallation.

Fig 1: Heated Oxygen Sensors & Exhaust Manifold - Bank 2 Sensor 1

Courtesy of GENERAL MOTORS COMPANY

If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.

CAUTION:

Refer to Fastener Caution .

Install the HO2S (1) to the exhaust manifold.
Tighten

Tighten the sensor to 42 N.m (31 lb ft).

Fig 2: Engine Wiring Harness Electrical Connector - Bank 2 Sensor 1

Courtesy of GENERAL MOTORS COMPANY

Connect the engine wiring harness electrical connector (2) to the HO2S electrical connector (3).
Install the HO2S electrical connector retainer to the engine wiring harness clip (1).
Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement .