Heated Oxygen Sensor (HO2S) Replacement

REMOVAL PROCEDURE

TOOLS REQUIRED
J 39194-B oxygen sensor wrench

NOTE: The Heated Oxygen Sensor (HO2S) and the Oxygen Sensor use a permanently attached pigtail and connector. Do not remove this pigtail from the Heated Oxygen Sensor. Damage or the removal of the pigtail or the connector could affect the proper operation of the sensor.

Take care when handling the HO2S and the O2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the O2S. Do not roughly handle the HO2S or the O2S.

When the engine temperature is below 48°C (120°F), the Heated Oxygen Sensor (HO2S) may be difficult to remove. Excessive force may damage the threads in the exhaust manifold or the exhaust pipe.

1. Turn OFF the ignition.

CAUTION: Refer to Vehicle Lifting Caution in Service Precautions.

2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in Vehicle Lifting.
3. Remove the electrical connector.

NOTE: The use of excessive force may damage the threads in the exhaust pipe.

4. Carefully remove the rear heated oxygen sensor using J 39194-B the oxygen sensor wrench.

INSTALLATION PROCEDURE

TOOLS REQUIRED
J 39194-B oxygen sensor wrench

IMPORTANT: A special anti-seize compound is used on the Heated Oxygen Sensor (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 engine and if for any reason it is to be reinstalled, the threads must have anti-seize compound applied before the reinstallation.

1. Coat the threads of the heated oxygen sensor with anti-seize compound if necessary.

NOTE: Refer to Component Tightening Notice in Service Precautions.

2. Install the sensor using J 39194-B oxygen sensor wrench.

Tighten
Tighten the sensor to 41 N.m (30 lb ft).

3. Install the HO2S 2 electrical connector.
4. Lower the vehicle.