Subaru XT 1988 Service Manual page 146

2-2
ON-CAR SERVICES
Oxygen (0
2 )
Sensor
REPLACEMENT
Oxygen (0
2 )
sensor is one of the important emission control
parts. Therefore, replace it as follows only when it is damaged
by external force, or if it seems to be out of order according
to troubleshooting etc.
REMOVAL
1) Disconnect oxygen (0
2 )
sensor cord.
2) Apply SUBARU CRC (004301003) or its equivalent to
threaded portion of oxygen
(0
2 )
sensor, and leave it for one
minute or more.
3) Loosen oxygen
(0
2 )
sensor by turning it 10 to 40 degrees
with SOCKET (499990110).
Fig.
6
6
4) Apply SUBARU CRC (004301003) to threaded portion
of oxygen (0
2 )
sensor again, and leave it for one minute or
more.
5) Remove oxygen
(0
2 )
sensor by using socket and wrench.
When removing, do not force oxygen
(02)
sensor especially
when exhaust pipe is cold; otherwise it will damage the
exhaust pipe.
INSTALLATION
1) Apply anti-seize compound ("SS-30" made by JET-LUBE
Inc. in U.S.A. or its equivalent) only to threaded portion of
oxygen (0
2 )
sensor to make the next removal easier.
Never apply anti-seize compound to protector of oxygen (0
2 )
sensor.
2) By using socket and torque wrench, install oxygen (0
2 )
sensor onto front exhaust pipe by tightening it to the specified
torque.
Torque [oxygen (02) sensor):
25 - 34 N·m (2.5 - 3.5 kg-m, 18 - 25 ft-Ib)
3) Securely connect oxygen
(0
2 )
sensor cord.