Rear Oxygen Sensor: Installation

CAUTION: If lubricant is spilt over the exhaust pipe, wipe it off with cloth to avoid emission of smoke or causing a fire.

Before installing rear oxygen sensor, apply the anti-seize compound only to the threaded portion of rear oxygen sensor to make the next removal easier.
CAUTION: Never apply anti-seize compound to the protector of rear oxygen sensor.

Anti-seize compound:

NEVER-SEEZ NSN, JET LUBE SS-30 or equivalent
Install the rear oxygen sensor.
Tightening torque:

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

Fig 1: Locating Rear Oxygen Sensor
Courtesy of SUBARU OF AMERICA, INC.
Connect the rear oxygen sensor connector.
NOTE: Be careful not to allow the rear oxygen sensor harness to interfere with the sensor unit and the front oxygen (A/F) sensor harness.

Fig 2: Identifying Front And Rear Oxygen Sensor Connector With Clip
Courtesy of SUBARU OF AMERICA, INC.
Install the under cover RH. < Refer to INSTALLATION , Front Under Cover. >
Lower the vehicle.
Connect the battery ground terminal.

Fig 3: Connecting/Disconnecting Battery Ground Terminal
Courtesy of SUBARU OF AMERICA, INC.