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Home >> Subaru >> 2018 >> WRX Base >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel Injection System (Except For STI) >> Front Oxygen (A/F) Sensor >> Installation

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.

    Tightening Torque:

    30 N.m (3.1 kgf-m, 22.1 ft-lb)

  3. Secure the front oxygen (A/F) sensor harness to the water pump cover using clip (B), and connect the front oxygen (A/F) sensor connector (A) to the engine wiring harness.
    G10266244
  4. Install the under cover. Ref. to EXTERIOR/INTERIOR TRIM>Front Under Cover>INSTALLATION .
  5. Lower the vehicle.
  6. Install the radiator main fan & fan motor assembly. Ref. to COOLING (EXCEPT FOR STI)>Radiator Main Fan and Fan Motor>INSTALLATION .
  7. Connect the ground terminal to battery sensor. Ref. to NOTE>BATTERY .