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Home >> Subaru >> 2013 >> Forester XT Touring >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (H4DOTC) >> Front Oxygen (A/F) Sensor >> Removal

Front Oxygen (A/F) Sensor: Removal

  1. Remove the collector cover.
  2. Disconnect the ground cable from battery.
    Fig 1: Disconnecting/Connecting Battery Ground Cable
    G06336085Courtesy of SUBARU OF AMERICA, INC.
  3. Remove the air intake duct (rear) and air cleaner case. < Refer to REMOVAL , Air Intake Duct. > < Refer to REMOVAL , Air Cleaner Case. >
  4. Disconnect the connectors from front oxygen (A/F) sensor.
    Fig 2: Locating Front Oxygen (A/F) Sensor Connector
    G08539915Courtesy of SUBARU OF AMERICA, INC.
  5. Lift up the vehicle.
  6. Remove the under cover. < Refer to REMOVAL , Front Under Cover. >
  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 Front Oxygen (A/F) Sensor With Mounting Nut
G08539916Courtesy of SUBARU OF AMERICA, INC.
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