Impreza WRX Wagon F4-2.0L DOHC Turbo (2002)
Oxygen Sensor: Service and Repair
Rear Oxygen Sensor
REMOVAL
1. Disconnect the battery ground cable.
2. Lift-up the vehicle.
3. Disconnect the connector from the rear oxygen sensor.
4. Remove the clip by pulling out from the upper side of crossmember.
5. Apply SUBARU CRC or its equivalent to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
SUBARU CRC (Part No. 004301003)
6. Remove the rear oxygen sensor.
CAUTION: When removing the oxygen sensor, wait until exhaust pipe cools, otherwise it will damage exhaust pipe.