Rear Oxygen Sensor: Installation

Before installing the rear oxygen (A/F) sensor, apply anti-seize compound only to the threaded portion of the rear 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 rear oxygen sensor.

Fig 1: Applying Anti-Seize Compound To Threaded Portion Of Rear Oxygen (A/F) Sensor
Courtesy of SUBARU OF AMERICA, INC.
Install the rear oxygen sensor.
Tightening torque:

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

Fig 2: Installing Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect the connector to the rear oxygen sensor.

Fig 3: Connecting Connector To Rear Oxygen 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.