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: Identifying Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.