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Home › Subaru › 2017 › Forester 2.5i, Eng CD FB25BA, Automatic CVT Trans › Repair and Diagnosis › Engine Performance › Engine Control Systems › Fuel Injection System (H4DO) › Front Oxygen (A/F) Sensor › Removal

Front Oxygen (A/F) Sensor: Removal

  1. Disconnect the ground terminal from battery sensor. Ref. to NOTE>NOTE>BATTERY .
  2. Remove the radiator sub fan and fan motor assembly. Ref. to COOLING(H4DO)>Radiator Sub Fan and Fan Motor>REMOVAL .
  3. Lift up the vehicle.
  4. Remove the under cover. Ref. to EXTERIOR/INTERIOR TRIM>Front Under Cover>REMOVAL .
  5. Disconnect the front oxygen (A/F) sensor connector, and remove the clip holding the front oxygen (A/F) sensor harness.
    Fig 1: Identifying Front Oxygen (A/F) Sensor Connector And Clip
    G11263374Courtesy of SUBARU OF AMERICA, INC.
  6. Lower the vehicle.
  7. Apply spray-type lubricant (004301003) or equivalent to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
  8. Remove the front oxygen (A/F) sensor.
    CAUTION: When removing the front oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.
    Fig 2: Locating Front Oxygen (A/F) Sensor
    G11263375Courtesy of SUBARU OF AMERICA, INC.
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