Oxygen Sensor: Service and Repair

Removal Procedure
1. Disconnect the negative battery cable.
2. Locate the two oxygen sensors.
- Bank 1 sensor 1 is mounted on the exhaust pipe ahead of the catalytic converter.
- Bank 1 sensor 2 is mounted on the exhaust pipe behind the catalytic converter.
3. Disconnect pig tail electrical connector.

IMPORTANT: The pigtail is permanently attached to the sensor. Be careful not to pull the wires out.

4. Unscrew sensors form the exhaust pipe. Because of the expansion and contraction of the metal in the exhaust system over time, this may be difficult if the engine temperature is below 48 degree C.

Inspection Procedure

NOTE: Both sensors are identical. Inspect each in the same way.

1. Inspect the pigtail and the electrical connector for grease, dirt, corrosion and bare wire or worn insulation.
2. Inspect the louvered end of the sensor for grease, dirt, excessive carbon build up or other contaminants.











Installation Procedure

NOTE: If HO2S is reinstalled after removal, special anti- seize compound or the equivalent should be applied to the threads. Special anti-seize compound, (P/N 5613695), is used or the HO2S threads. This compound consists of glass beads suspended in a liquid graphite solution. The graphite burns away with exhaust heat, but the glass beads will remain, making the sensor easier to remove.

1. Apply anti-seize compound or the equivalent to the thread.
2. Install HO2S on the exhaust pipe.
3. Tighten the sensor to 55 Nm (40 lb ft).
4. Connect the pig tail to the wiring harness.
5. Connect the negative battery cable.
(Pre-Catalytic Converter Heated Oxygen Sensor Location)
(Post-Catalytic Converter Heated Oxygen Sensor Location)