Impreza F4-2.5L SOHC (2003)
CAUTION: Never apply anti-seize compound to protector of front oxygen (A/F) sensor.
2. Install the front oxygen (A/F) sensor
Tightening torque: 21 N.m (2.1 kgf-m, 15.2 ft-lb)
3. Lower the vehicle.
4. Connect the connector to front oxygen (A/F) sensor, and then connect the connector to engine hanger.
5. Connect the battery ground cable to battery.
