Subaru Legacy 2003 Service Manual page 743

FUEL INJECTION (FUEL SYSTEMS)
12.Oxygen Sensor
A: REMOVAL
1) Disconnect battery ground cable.
2) Disconnect connector from oxygen sensor.
3) Lift-up the vehicle.
4) Apply SUBARU CRC or its equivalent to thread-
ed portion of oxygen sensor, and leave it for one
minute or more.
SUBARU CRC (Part No. 004301003)
5) Remove oxygen sensor.
CAUTION:
When removing the oxygen sensor, wait until
exhaust pipe cools, otherwise it will damage ex-
haust pipe.
OXYGEN SENSOR
B: INSTALLATION
1) Before installing oxygen sensor, apply anti-seize
compound only to threaded portion of oxygen sen-
sor to make the next removal easier.
Anti-seize compound:
CAUTION:
Never apply anti-seize compound to protector
of oxygen sensor.
FU-00009
2) Install oxygen sensor.
Tightening torque:
FU-00752
3) Lower the vehicle.
4) Connect connector of oxygen sensor.
FU-00195
FU(H4SOw/oOBD)-40
SS-30 by JET LUBE
21 N·m (2.1 kgf-m, 15.2 ft-lb)
FU-00196
FU-00195
FU-00752