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Home >> Subaru >> 2012 >> Forester X, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System - Fuel Injection (H4DO) >> Front Oxygen (A/F) Sensor >> Removal
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Front Oxygen (A/F) Sensor: Removal

  1. Disconnect the ground cable from battery.
    Fig 1: Disconnecting Ground Cable From Battery
    G07664768Courtesy of SUBARU OF AMERICA, INC.
  2. Remove the radiator sub fan. < Ref. to REMOVAL , Radiator Sub Fan and Fan Motor. >
  3. Lift up the vehicle.
  4. Remove the under cover RH. < Ref. to REMOVAL , Front Under Cover. >
  5. Disconnect the front oxygen (A/F) sensor connector, and remove the clip holding the front oxygen (A/F) sensor harness.
    Fig 2: Front Oxygen (A/F) Sensor Connector, Rear Oxygen Sensor Connector And Clips
    G07664769Courtesy of SUBARU OF AMERICA, INC.
  6. Lower the vehicle.
  7. Apply spray-type lubricant 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 3: Locating Exhaust Pipe
    G07664770Courtesy of SUBARU OF AMERICA, INC.
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