Front Oxygen (A/F) Sensor: Removal

Disconnect the ground terminal from battery sensor. <Ref. to BATTERY , NOTE, Repair Contents.>
Lift up the vehicle.
Disconnect the connector (A) of the front oxygen (A/F) sensor.
Remove the clip (B) securing the front oxygen (A/F) sensor harness. (LH side only)
Apply spray-type lubricant (004301003) or equivalent to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
Remove the front oxygen (A/F) sensor.
CAUTION: When removing the front oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.
- RH side
  
  Fig 1: Front Oxygen (A/F) Sensor Connector - RH Side
  Courtesy of SUBARU OF AMERICA, INC.
- LH side
Fig 2: Front Oxygen (A/F) Sensor Connector And Harness Clip - LH Side
Courtesy of SUBARU OF AMERICA, INC.