Oxygen Sensor (Fa20): Removal

Disconnection of the battery ground terminal (Refer to WORKING PRECAUTIONS AND NOTES )
Removal of front tire RH
Under cover front AL removal (Refer to REMOVAL )
Disconnection of under cover front side RH
1. Remove 3 clips, and disconnect the under cover front side RH.
  
  Fig 1: Disconnecting Under Cover Front Side RH
  Courtesy of SUBARU OF AMERICA, INC.
Removal of oxygen sensor
1. Disconnect the connector for oxygen sensor and the 2 clamps.
  
  Fig 2: Locating Oxygen Sensor Connector And Clamps
  Courtesy of SUBARU OF AMERICA, INC.
2. Remove the oxygen sensor from the exhaust manifold.
  
  Fig 3: Locating Oxygen Sensor In Exhaust Manifold
  Courtesy of SUBARU OF AMERICA, INC.