Rear Oxygen Sensor: Removal

Disconnect the ground cable from battery.

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

Fig 2: Disconnecting Connector From Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Remove the clip by pulling out from the upper side of crossmember.

Fig 3: Removing Clip By Pulling Out From Upper Side Of Crossmember
Courtesy of SUBARU OF AMERICA, INC.
Apply SUBARU CRC or its equivalent to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
SUBARU CRC (Part No. 004301003)
Remove the rear oxygen sensor.

CAUTION: When removing the oxygen sensor, wait until exhaust pipe cools; otherwise, it will damage exhaust pipe.

Fig 4: Removing Rear Oxygen Sensor

Courtesy of SUBARU OF AMERICA, INC.