Front Oxygen (A/F) Sensor: Removal

Disconnect battery ground cable.

Fig 1: Disconnecting Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.
Disconnect connector from front oxygen (A/F) sensor.

Fig 2: Disconnecting Connector From Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lift-up the vehicle.
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
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.

Fig 3: Removing Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.