Front Oxygen (A/F) Sensor: Installation

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

NEVER-SEEZ NSN, JET LUBE SS-30

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

21 N.m (2.1 kgf-m, 15.5 ft-lb)
- LH side
  
  Fig 1: Locating Front Oxygen (A/F) Sensor (LH)
  Courtesy of SUBARU OF AMERICA, INC.
- RH side
  
  Fig 2: Locating Front Oxygen (A/F) Sensor (RH)
  Courtesy of SUBARU OF AMERICA, INC.
Connect the connector of front oxygen (A/F) sensor.
- LH side
  
  Fig 3: Locating Front Oxygen (A/F) Sensor (LH)
  Courtesy of SUBARU OF AMERICA, INC.
- RH side
  
  Fig 4: Locating Front Oxygen (A/F) Sensor (RH)
  Courtesy of SUBARU OF AMERICA, INC.
Lower the vehicle.
Connect the battery ground cable to battery.

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