Forester S F4-2.5L DOHC (1998)
Oxygen Sensor: Service and Repair
Front Oxygen Sensor
FRONT OXYGEN SENSOR
REMOVAL
1) Disconnect battery ground cable.
2) Disconnect connector from front oxygen sensor.
3) Lift-up the vehicle.
4) Apply SUBARU CRC or its equivalent to threaded portion of front oxygen sensor, and leave it for one minute or more. SUBARU CRC (Part
No. 004301003)
5) Remove front oxygen sensor.
CAUTION: When removing oxygen sensor, do not force oxygen sensor especially when exhaust pipe is cold, otherwise it will damage exhaust
pipe.
INSTALLATION
1) Before installing front oxygen sensor, apply anti-seize compound only to threaded portion of front oxygen sensor to make the next removal easier.
