Front Oxygen (A/F) Sensor: Installation

CAUTION: If lubricant is spilt onto the exhaust pipe, wipe it off completely 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 kgf-m, 22.1 ft-lb)

Fig 1: Identifying Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Install the under cover.
Lower the vehicle.
Secure the front oxygen (A/F) sensor harness to the engine harness stay using the clips (A).

Fig 2: Identifying Front Oxygen (A/F) Sensor Harness To Engine Harness Stay And Clips
Courtesy of SUBARU OF AMERICA, INC.
Connect the connector to the front oxygen (A/F) sensor, and secure the return hose and front oxygen (A/F) sensor harness using the clip (A).

Fig 3: Locating Front Oxygen (A/F) Sensor Connector And Clip
Courtesy of SUBARU OF AMERICA, INC.
Connect the ground cable to battery.

Fig 4: Identifying Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.