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Front Oxygen (A/F) Sensor: Removal

  1. Disconnect the ground cable from battery.
    Fig 1: Disconnecting Ground Cable From Battery
    G07662804Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the air intake duct. < Ref. to REMOVAL , Air Intake Duct. >
  3. Disconnect the front oxygen (A/F) sensor connector, and remove the clip holding the front oxygen (A/F) sensor harness.
    Fig 2: Identifying Front Oxygen (A/F) Sensor Connector, Rear Oxygen Sensor Harness And Clip
    G07662805Courtesy of SUBARU OF AMERICA, INC.
  4. Lift up the vehicle.
  5. Remove the under cover. < Ref. to REMOVAL , Front Under Cover. >
  6. Apply spray-type lubricant to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
  7. 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 3: Identifying Front Oxygen (A/F) Sensor And Rear Oxygen Sensor
    G07662806Courtesy of SUBARU OF AMERICA, INC.
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