Front Oxygen (A/F) Sensor: Removal

Disconnect ground cable from battery.

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

Fig 2: Disconnecting Connectors From Engine Hanger & 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.