Impreza RS Coupe AWD F4-2.5L SOHC (1999)
Oxygen Sensor: Service and Repair
Front Oxygen (A/F) Sensor
Removal
1. Disconnect battery ground cable.
2. Disconnect connector from front oxygen sensor.
3. Lift-up the vehicle.
4. Apply SUBARU CRC or its equivalent to threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
SUBARU CRC (Part No.004301003)
5. Remove front oxygen (A/F) sensor.
CAUTION: When removing, do not force front oxygen (A/F) sensor in an unnatural way especially when exhaust pipe is cold, otherwise it will
damage exhaust pipe.
Installation
