Impreza F4-2.5L SOHC (2003)
Oxygen Sensor: Service and Repair
Rear Oxygen Sensor
REMOVAL
1. Disconnect the ground cable from battery.
2. Lift up the vehicle.
3. Disconnect the connector from the rear oxygen sensor.
4. Apply SUBARU CRC or its equivalent to the threaded portion of rear oxygen sensor, and leave it for one minute or more.
SUBARU CRC (Part No. 004301003)
5. Remove the rear oxygen sensor.
CAUTION: When removing the rear oxygen sensor, wait until the exhaust pipe cools, otherwise it will damage the exhaust pipe.
INSTALLATION