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Home >> Subaru >> 2016 >> Forester 2.5i, Eng CD FB25BA, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection (Fuel Systems) (H4DO) >> Front Oxygen (A/F) Sensor >> Removal
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Front Oxygen (A/F) Sensor: Removal

  1. Disconnect the ground cable from 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: Locating Front Oxygen (A/F) Sensor Connector
    G10402837Courtesy of SUBARU OF AMERICA, INC.
  6. Lower the vehicle.
  7. Apply spray-type lubricant (004301003) 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
    G09475577Courtesy of SUBARU OF AMERICA, INC.
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