Subaru 2009 IMPREZA Service Manual page 975

FUEL INJECTION (FUEL SYSTEMS)
17.Rear Oxygen Sensor
A: REMOVAL
1) Set the vehicle on a lift.
2) Disconnect the ground cable from battery.
3) Lift up the vehicle.
4) Disconnect the connector from the rear oxygen
sensor, and remove the clip (A) holding the rear ox-
ygen sensor harness.
• AT MODEL
• MT MODEL
(A)
5) Apply spray-type lubricant to the threaded por-
tion of rear oxygen sensor, and leave it for one
minute or more.
Rear Oxygen Sensor
6) Remove the rear oxygen sensor.
CAUTION:
When removing the rear oxygen sensor, wait
until exhaust pipe cools, otherwise it will dam-
age the exhaust pipe.
IN-00203
B: INSTALLATION
CAUTION:
If lubricant is spilt onto the exhaust pipe, wipe it
off completely with cloth to avoid emission of
smoke or causing a fire.
1) Before installing rear oxygen sensor, apply the
anti-seize compound only to the threaded portion of
rear oxygen sensor to make the next removal eas-
ier.
(A)
CAUTION:
Never apply anti-seize compound to the protec-
tor of rear oxygen sensor.
Anti-seize compound:
EX-02329
NEVER-SEEZ NSN, JET LUBE SS-30 or
equivalent
2) Install the rear oxygen sensor.
Tightening torque:
21 N·m (2.1 kgf-m, 15.5 ft-lb)
EX-02345
FU(H4DOTC)-50
FU-03829
FU-03829