Front Oxygen (A/F) Sensor: Installation

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, 15.2 ft-lb)

Fig 1: Identifying Front Oxygen (A/F) Sensor And Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Install the under cover.
Lower the vehicle.
Connect the front oxygen (A/F) sensor connector and fasten the harness with clips.

Fig 2: Identifying Front Oxygen (A/F) Sensor And Rear Oxygen Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.
Connect the ground cable to the battery.

Fig 3: Connecting Ground Cable To Battery

Courtesy of SUBARU OF AMERICA, INC.