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.

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
Install the front oxygen (A/F) sensor.
Tightening torque:

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

Fig 1: Locating Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lift up the vehicle.
Secure the front oxygen (A/F) sensor harness to the water pump cover using clip (A), and connect the front oxygen (A/F) sensor connector to the engine harness.

Fig 2: Locating Front Oxygen (A/F) Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.
Install the under cover. Ref. to EXTERIOR/INTERIOR TRIM>Front Under Cover>INSTALLATION .
Lower the vehicle.
Install the radiator sub fan and fan motor assembly. Ref. to COOLING(H4DOTC)>Radiator Sub Fan and Fan Motor>INSTALLATION .
Connect the battery ground terminal.