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Air/Fuel Ratio Sensor (Fa20): Removal

Disconnection of the battery ground terminal (Refer to WORKING PRECAUTIONS AND NOTES )
Removal of air/fuel ratio sensor
1. Disconnect the connector for air/fuel ratio sensor and the 2 clamps.
  
  Fig 1: Locating Air/Fuel Ratio Sensor Connector
  Courtesy of SUBARU OF AMERICA, INC.
2. Remove the air/fuel ratio sensor from the exhaust manifold.
  
  Fig 2: Locating Air/Fuel Ratio Sensor In Exhaust Manifold
  Courtesy of SUBARU OF AMERICA, INC.