Heated Oxygen Sensor (HO2S) 1 Replacement

TOOLS REQUIRED
J 39194-B Heated Oxygen Sensor Wrench.

REMOVAL PROCEDURE

NOTE:
- Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
- Take care when handling oxygen sensors. The electrical connector and louvered end must be kept free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

IMPORTANT: A special anti-seize compound is used on the oxygen sensor threads. New service sensors should already have the compound applied to the threads. Coat the threads of a reused sensor with anti-seize compound GM P/N 12377953 or equivalent.




1. Disconnect the HO2S electrical connector.
2. Remove the electrical connector from the mounting hole.
3. Remove the HO2S (1) from the right exhaust manifold using the J 39194-B.

INSTALLATION PROCEDURE

NOTE: Refer to Fastener Notice in Service Precautions.

IMPORTANT: Ensure that the correct replacement HO2S is used. The engine HO2S 1 and the post-converter HO2S 2 are both 6.6-watt Denso sensors. Due to differences in pigtail length, the sensors use different connectors and are not interchangeable.




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

Tighten
Use the J 34730 39194-B to tighten the HO2S to 41 N.m (30 lb ft).

2. Install the electrical connector into the mounting hole.
3. Connect the HO2S electrical connector.