Impreza 2.5 RS Coupe F4-2.5L SOHC (2000)
1. Before installing rear oxygen sensor, apply anti-seize compound only to threaded portion of rear oxygen sensor to make the next removal easier.
CAUTION: Never apply anti-seize compound to protector of rear oxygen sensor.
Anti-seize compound: SS-30 by JET LUBE
2. Install rear oxygen sensor.
Tightening torque:
21 ± 3 N.m (2.1 ± 0.3 kg.m 15.2 ± 2.2 ft.lb)
3. Connect connector to rear oxygen sensor.
4. Lower the vehicle.
5. Connect battery ground cable.