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Home >> Subaru >> 2015 >> Outback 2.5i >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (H4DO) >> Front Oxygen (A/F) Sensor >> Removal
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Front Oxygen (A/F) Sensor: Removal

  1. Disconnect the ground terminal from battery sensor. <Ref. to BATTERY , NOTE, Repair Contents.>
  2. Lift up the vehicle.
  3. Remove the under cover. <Ref. to REMOVAL , Front Under Cover.>
  4. 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
    G10262197Courtesy of SUBARU OF AMERICA, INC.
  5. Lower the vehicle.
  6. 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.
  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 2: Locating Front Oxygen (A/F) Sensor
    G10262198Courtesy of SUBARU OF AMERICA, INC.
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