Rear Oxygen Sensor: Removal

Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the clip holding harness, and then disconnect the connector of rear oxygen sensor.

Fig 2: Removing Clip Holding Harness
Courtesy of SUBARU OF AMERICA, INC.
Lift up the vehicle.
Apply spray type lubricant to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
Remove the rear oxygen sensor.
CAUTION: When removing the rear oxygen sensor, wait until the exhaust pipe cools, otherwise it will damage the exhaust pipe.

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