Rear Oxygen Sensor: Removal

Disconnect ground cable from battery.

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

Fig 2: Disconnecting Rear Oxygen Sensor Connector
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 (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage exhaust pipe.

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