Rear Oxygen Sensor: Removal

Disconnect ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Disconnect connector from rear oxygen sensor.

Fig 2: Disconnecting Connector From Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lift-up the vehicle.
Apply SUBARU CRC or its equivalent to threaded portion of rear oxygen sensor, and leave it for one minute or more.
SUBARU CRC: Part No. 004301003
Remove rear oxygen sensor.
CAUTION: When removing the oxygen sensor, wait until exhaust pipe cools, otherwise it will damage exhaust pipe.

Fig 3: Removing Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.