Front Oxygen (A/F) Sensor: Removal

Set the vehicle on a lift.
Disconnect the ground cable from the battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the connector from front oxygen (A/ F) sensor.

Fig 2: Identifying Front Oxygen (A/ F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Disconnect the engine harness fixed by clip (A) from the bracket (B).

Fig 3: Identifying Engine Harness Clip And Bracket
Courtesy of SUBARU OF AMERICA, INC.
Remove the front right side wheel.
Lift-up the vehicle.
Remove the service hole cover.

Fig 4: Identifying Service Hole Cover
Courtesy of SUBARU OF AMERICA, INC.
Apply spray-type lubricant to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
Remove the front oxygen (A/F) sensor.
CAUTION: When removing the oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.

Fig 5: Identifying Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.