Front Oxygen (A/F) Sensor: Removal

WARNING: This page is about a different variant/trim than selected.

Disconnect the ground cable from battery.

Fig 1: Disconnecting Ground Cable From Battery
Courtesy of SUBARU OF AMERICA, INC.
Remove the radiator main fan motor assembly. Refer to RADIATOR SUB FAN AND FAN MOTOR .
Disconnect the connector from the front oxygen (A/F) sensor, and remove the clip (A) holding the front oxygen (A/F) sensor harness.

Fig 2: Locating Front Oxygen (A/F) Sensor And Clips
Courtesy of SUBARU OF AMERICA, INC.
Apply spray-type lubricant 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 by using a sensor socket.

CAUTION: When removing the front oxygen (A/F) sensor, wait until exhaust pipe cools, otherwise it will damage the exhaust pipe.

Fig 3: Locating Front Oxygen Sensor Threaded Portion

Courtesy of SUBARU OF AMERICA, INC.