Front Oxygen (A/F) Sensor: Installation

Before Identifying front oxygen (A/F) sensor, apply the anti-seize compound only to the threaded portion of front oxygen (A/F) sensor to make the next removal easier.
Anti-seize compound: SS-30 by JET LUBE

CAUTION: Never apply anti-seize compound to protector of front oxygen (A/F) sensor.

Fig 1: Applying Anti-Seize Compound Only To Threaded Portion Of Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Install the front oxygen (A/F) sensor.
Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)

Fig 2: Identifying Front Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect the connector to front oxygen (A/F) sensor, and then connect the connector to engine hanger.

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

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