Front Oxygen (A/F) Sensor - Subaru Legacy 2003 Service Manual

14.Front Oxygen (A/F) Sensor

A: REMOVAL
1) Disconnect the ground cable from battery.
2) Disconnect the connector from engine hanger,
and then disconnect the connector from front oxy-
gen (A/F) sensor.
3) Lift-up the vehicle.
4) Apply SUBARU CRC or its equivalent to the
threaded portion of front oxygen (A/F) sensor, and
leave it for one minute or more.
SUBARU CRC (Part No. 004301003)
5) Remove the front oxygen (A/F) sensor.
CAUTION:
When removing the oxygen (A/F) sensor, wait
until exhaust pipe cools, otherwise it will dam-
age exhaust pipe.
FRONT OXYGEN (A/F) SENSOR
FU-00009
EX-00029
FU-00195
FU(H4SO)-41
FUEL INJECTION (FUEL SYSTEMS)
B: INSTALLATION
1) Before installing front oxygen (A/F) sensor, ap-
ply the anti-seize compound only to the threaded
portion of front oxygen (A/F) sensor to make the
next removal easier.
Anti-seize compound:
SS-30 by JET LUBE
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.
FU-00196
FU-00195
EX-00029