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Home >> Subaru >> 2015 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System (Except STI) >> Rear Oxygen Sensor >> Removal
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Rear Oxygen Sensor: Removal

  1. Disconnect the ground terminal from battery sensor. <Ref. to BATTERY , NOTE, Note.>
  2. Lift up the vehicle.
  3. Remove the under cover. <Ref. to REMOVAL , Front Under Cover.>
  4. Disconnect the connector on the rear oxygen sensor from the engine harness.
    Fig 1: Locating Rear Oxygen Sensor Connector
    G10266247Courtesy of SUBARU OF AMERICA, INC.
  5. Apply spray-type lubricant to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
  6. Remove the rear oxygen sensor.
    CAUTION: When removing the rear oxygen sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.
    Fig 2: Locating Rear Oxygen Sensor
    G10266248Courtesy of SUBARU OF AMERICA, INC.
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