For 1990-2009 cars

#### Special Tools

J 39194-B Heated Oxygen Sensor Wrench

Caution: When replacing the HO2S perform the following:

• | A code clear with a scan tool, regardless of whether or not a DTC is set

• | HO2S heater resistance learn reset with a scan tool, where available

Perform the above in order to reset the HO2S resistance learned value and avoid possible HO2S failure.

Caution: Refer to Heated Oxygen and Oxygen Sensor Caution in the Preface section.

### Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Disconnect the heated oxygen sensor (HO2S) electrical connector (3) from the engine wiring harness connector (1).

Caution: Refer to Excessive Force and Oxygen Sensor Caution in the Preface section.

3. Using the J 39194-B , remove the HO2S (1) from the catalytic converter.

### Installation Procedure

Note: Use special anti-seize compound on the HO2S threads. The compound consists of graphite suspended in fluid and glass beads. The graphite burns away, but the glass beads remain, making the sensor easier to remove. New or service sensors already have the compound applied to the threads. If you remove an oxygen sensor and if for any reason you must reinstall the same oxygen sensor, apply the anti-seize compound to the threads before reinstallation.

1. Coat the threads of the HO2S with the anti-seize compound P/N 5613695, or equivalent if necessary.

Caution: Refer to Component Fastener Tightening Caution in the Preface section.

2. Using the J 39194-B , install the HO2S (1) into the catalytic converter.

Tighten
Tighten the HO2S to 42 N·m (31 lb ft).

3. Connect the HO2S electrical connector (3) to the engine wiring harness connector (1).
4. Lower the vehicle.