Oxygen Sensor: Service and Repair

REMOVAL PROCEDURE (HO2S1)

TOOLS REQUIRED
J 39194-B Heated Oxygen Sensor Socket

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

1. Turn OFF the ignition switch.
2. Disconnect the electrical connector.

IMPORTANT: A special anti seize compound is used on the heated oxygen sensor 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 if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

3. Using special tool J 39194-B carefully back out the heated oxygen sensor.

INSTALLATION PROCEDURE (HO2S1)
1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 5613695, or equivalent if necessary.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Using special tool J 39194-B install the Heated Oxygen Sensor.

Tighten
Tighten the HO2S 1 (Pre catalytic converter) to 42 N.m (31 lb ft).

3. Connect the electrical connector.




REMOVAL PROCEDURE (HO2S2)
The heated oxygen sensor may be difficult to remove when engine temperature is below 48°C (120°F). Excessive force may damage threads in exhaust manifold or exhaust pipe.
1. Turn OFF the ignition switch.
2. Raise the vehicle.
3. Disconnect the electrical connector.

IMPORTANT: A special anti-seize compound is used on the heated oxygen sensor 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 if for any reason is to be reinstalled, the threads must have anti seize compound applied before reinstallation.

4. Using special tool J 39194-B carefully back out the heated oxygen sensor.

INSTALLATION PROCEDURE (HO2S2)
1. Coat the threads of heated oxygen sensor/catalyst monitor with anti seize compound P/N 5613695, or equivalent if necessary.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Using special tool J 39194-B install the Heated Oxygen Sensor.

Tighten
Tighten the HO2S 2 (Post catalytic converter) to 42 N.m (31 lb ft).

3. Connect the electrical connector.