Front Oxygen (A/F) Sensor: Installation

Before installing front oxygen (A/F) sensor, apply anti-seize compound only to 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.
Install front oxygen (A/F) sensor.
Tightening torque:

21 N.m (2.1 kgf-m, 15.2 ft-lb)

Fig 1: Installing Front Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect connector of front oxygen (A/F) sensor.

Fig 2: Connecting Front Oxygen Sensor Connector
Courtesy of SUBARU OF AMERICA, INC.
Connect battery ground cable.

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