Rear Oxygen Sensor: Removal

Disconnect the ground cable from battery.

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

Fig 2: Disconnecting Connector Of Rear Oxygen Sensor
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.