Front Oxygen (A/F) Sensor: Removal

Disconnect ground cable from battery.

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

Fig 2: Disconnecting Front Oxygen (A/F) Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.
Lift-up the vehicle.
Remove undercover.
Separate harness from clip (A).
- LH side
  
  Fig 3: Separating Harness From Clip (LH)
  Courtesy of SUBARU OF AMERICA, INC.
- RH side
  
  Fig 4: Separating Harness From Clip (RH)
  Courtesy of SUBARU OF AMERICA, INC.
Apply SUBARU CRC or its equivalent to threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
SUBARU CRC (Part No. 004301003)
Remove front oxygen (A/F) sensor.
CAUTION: When removing the oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage exhaust pipe.

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

Fig 6: Removing Front Oxygen (A/F) Sensor (RH)
Courtesy of SUBARU OF AMERICA, INC.