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:

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

Fig 1: Identifying Front Oxygen (A/F) Sensor And Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Install the under cover. < Ref. to INSTALLATION , Front Under Cover. >
Lower the vehicle.
Connect the front oxygen (A/F) sensor connector, and secure the front oxygen (A/F) sensor harness by using the clip.

Fig 2: Identifying Front Oxygen (A/F) Sensor Connector, Rear Oxygen Sensor Harness And Clip
Courtesy of SUBARU OF AMERICA, INC.
Install the air intake duct. < Ref. to INSTALLATION , Air Intake Duct. >
Connect the battery ground terminal.

Fig 3: Connecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.