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Home >> Subaru >> 2021 >> Forester Premium >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Fuel Injection System >> Front Oxygen (A/F) Sensor >> Installation
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Front Oxygen (A/F) Sensor: Installation

CAUTION: If lubricant is spilt over the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.
  1. Before installing front oxygen (A/F) sensor, apply anti-seize compound only to the threaded portion of front oxygen (A/F) sensor to make the next removal easier.
    CAUTION: Never apply anti-seize compound to the protector of front oxygen (A/F) sensor.

    Anti-seize compound: 

    NEVER-SEEZ NSN, JET LUBE SS-30 or equivalent

  2. Install the front oxygen (A/F) sensor and connect the connector.

    Tightening torque: 

    21 N.m (2.1 kgf.m, 15.5 ft.lb)

  3. Install the under cover front. Ref. to EXTERIOR/INTERIOR TRIM>FRONT UNDER COVER>INSTALLATION .
  4. Lower the vehicle.
  5. Connect the ground terminal to battery sensor. Ref. to GROUND TERMINAL REMOVAL OR INSTALLATION .
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