Oxygen Sensor: Service and Repair

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 02S. Keep the in-line electrical connector and the covered end free of grease, dirt, or other contaminants. Also avoid using cleaning solvents of any type. Do not drop the HO2S or the 02S. Do not roughly handle the HO2S or the 02S. A dropped sensor is a bad sensor.

REMOVE OR DISCONNECT

CAUTION: 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. If HO2S 2 is being replaced, raise the vehicle.
2. Electrical connector.
3. Carefully back out heated oxygen sensor.

INSTALL OR CONNECT

CAUTION: 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.

1. Coat the threads of heated oxygen sensor/catalyst monitor with anti-seize compound P/N 5613695, or equivalent if necessary.
2. Install the Heated Oxygen Sensor.
- Torque the Heated Oxygen Sensor to 40 Nm (30 lb. ft.).
3. Connect the electrical connector.