Forester F4-2.5L Turbo (2009)
Oxygen Sensor: Service and Repair
Front Oxygen (A/F) Sensor
Front Oxygen (A/F) Sensor
REMOVAL
1. Set the vehicle on a lift.
2. Remove the collector cover.
3. Disconnect the ground cable from battery.
4. Disconnect the connector from the front oxygen (A/F) sensor, and remove the clip (A) holding the return hose and the front oxygen (A/F) sensor
harness.
5. Remove the clip (A) and (B) holding the front oxygen (A/F) sensor harness.
6. Lift up the vehicle
7. Remove the under cover.
8. Apply spray-type lubricant or equivalent to the threaded portion of front oxygen (A/F) sensor, and leave it for one minute or more.
9. Remove the front oxygen (A/F) sensor.