CAUTION: If lubricant is split onto 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)
- LH side
  
  Fig 1: Locating LH Side Rear Oxygen Sensor Connector
  Courtesy of SUBARU OF AMERICA, INC.
- RH side
  
  Fig 2: Locating RH Side Rear Oxygen Sensor Connector
  Courtesy of SUBARU OF AMERICA, INC.
Hold the harness with clip.
Connect the connector to rear oxygen sensor. LH side
- RH side
  
  Fig 3: Locating LH Side Rear Oxygen Sensor Connector
  Courtesy of SUBARU OF AMERICA, INC.
- LH side
  
  Fig 4: Locating RH Side Rear Oxygen Sensor Connector
  Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect the ground cable to battery.

Fig 5: Connecting Battery Ground Cable
Courtesy of SUBARU OF AMERICA, INC.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Rear Oxygen Sensor: Installation