Front Oxygen (A/F) Sensor: Removal

Disconnect battery ground cable.

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

Fig 2: Disconnecting Connector From Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lift-up the vehicle.
Remove under cover.
Separate harness from clip (A).
- RH side
  
  Fig 3: Separating Harness From Clip RH Side
  Courtesy of SUBARU OF AMERICA, INC.
- LH side
  
  Fig 4: Separating Harness From Clip LH Side
  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 front oxygen (A/F) sensor, do not force front oxygen (A/F) sensor especially when exhaust pipe is cold, otherwise it will damage exhaust pipe.

Fig 5: Removing Front Oxygen (A/F) Sensor (1 Of 2)
Courtesy of SUBARU OF AMERICA, INC.

Fig 6: Removing Front Oxygen (A/F) Sensor (2 Of 2)
Courtesy of SUBARU OF AMERICA, INC.