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 the oxygen (A/F) sensor, wait until exhaust pipe cools, 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 Nm (2.1 kgf-m, 15.2 ft-lb)
3. Lower the vehicle.
4. Connect connector of front oxygen (A/F) sensor.
5. Connect battery ground cable.