Front Oxygen (A/F) Sensor

Removal




1. Disconnect battery ground cable.




2. Disconnect connector from front oxygen (A/F) sensor.
3. Lift-up the vehicle.
4. Apply SUBARU CRC or its equivalent to threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.

SUBARU CRC (Part No.004301003)




5. Remove front oxygen (A/F) sensor.

CAUTION: When removing front oxygen (A/F) sensor, do not force front oxygen (A/F) sensor especially when exhaust pipe is cold, otherwise it will damage exhaust pipe.

Installation




1. Before installing front oxygen (A/F) sensor, apply anti-seize compound only to threaded portion of front oxygen (A/F) sensor to make the next removal easier.

Anti-seize compound: SS-30 by JET LUBE

CAUTION: Never apply anti-seize compound to protector of front oxygen (A/F) sensor.




2. Install front oxygen (A/F) sensor.

Tightening torque:
21 ± 3 N.m (2.1 ± 0.3 kg.m, 15.2 ± 2.2 ft.lb)

3. Lower the vehicle.




4. Connect connector of front oxygen (A/F) sensor.




5. Connect battery ground cable.