Heated Oxygen Sensor Replacement - Bank 1 Sensor 1

Heated Oxygen Sensor Replacement - Bank 1 Sensor 1

Special Tools

J 39194-B Heated Oxygen Sensor Wrench

Removal Procedure

Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (Heated Oxygen Sensor Resistance Learn Reset Caution).




1. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement (Service and Repair).
2. Remove the connector position assurance (CPA) retainer (2).
3. Disconnect the heated oxygen sensor (HO2S) (1) electrical connector.
4. Remove the HO2S clip from the ignition control module bracket.





Note: The HO2S may be difficult to remove when the engine temperature is less than 48°C (120°F). Excessive force may damage the threads in the exhaust manifold.

5. Remove the HO2S using the J 39194-B .

Installation Procedure





Note: A special anti-seize compound is used on the HO2S 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 the reinstallation.

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

Caution: Refer to Fastener Caution (Fastener Caution).

2. Install the HO2S.

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




3. Connect the HO2S (1) electrical connector.
4. Install the CPA retainer (2).
5. Install the HO2S clip to the ignition control module bracket.
6. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement (Service and Repair).