Heated Oxygen Sensor Replacement - Bank 1 Sensor 2

Heated Oxygen Sensor Replacement - Bank 1 Sensor 2

Tools Required

J 39194-B Heated Oxygen Sensor Wrench

Removal Procedure

Notice: Refer to Heated Oxygen Sensor Resistance Learn Reset Notice.




1. Raise and support the vehicle. Refer to Vehicle Lifting.
2. Remove the connector position assurance (CPA) retainer (1).
3. Disconnect the engine heated oxygen sensor (HO2S) electrical connector from the engine wiring harness electrical connector (2).






Notice: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.

4. Remove the HO2S (2) using the J 39194-B.

Installation Procedure






Important: A special anti-seize compound is used on the HO2S 2 threads. The compound consists of graphite suspended in fluid and glass beads. The graphite will burn away, but the glass beads will remain, making the sensor easier to remove. New or service sensors will already have the compound applied to the threads. If a sensor is removed from an engine and is to be reinstalled, the threads must have anti-seize compound applied before reinstallation.

1. Coat the threads of the HO2S with anti-seize compound GM P/N 12377953 or equivalent, if necessary.

Notice: Refer to Fastener Notice.

2. Install the HO2S (2).

Tighten the sensor to 42 N.m (31 lb ft) using the J 39194-B.




3. Connect the engine HO2S electrical connector to the engine wiring harness electrical connector (2).
4. Install the CPA retainer (1).
5. Lower the vehicle.