Subaru LEGACY 2006 Manual page 680

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FUEL INJECTION (FUEL SYSTEMS)
15.Front Oxygen (A/F) Sensor
A: REMOVAL
1) Disconnect the ground cable from the battery.
2) Remove the clip fastening the harness and dis-
connect the front oxygen (A/F) sensor connector.
(B)
(A) Front oxygen (A/F) sensor connector
(B) Rear oxygen sensor connector
3) Lift-up the vehicle.
4) Remove the under cover.
5) Apply spray-type lubricant to the threaded por-
tion of front oxygen (A/F) sensor, and leave it for
one minute or more.
6) Remove the front oxygen (A/F) sensor.
CAUTION:
When removing the front oxygen (A/F) sensor,
wait until exhaust pipe cools, because it can
damage the exhaust pipe.
(B)
(A)
(A) Front oxygen (A/F) sensor
(B) Rear oxygen sensor
Front Oxygen (A/F) Sensor
B: INSTALLATION
1) Before installing front oxygen (A/F) sensor, ap-
ply anti-seize compound only to the threaded por-
tion of front oxygen (A/F) sensor to make the next
removal easier.
Anti-seize compound:
NEVER-SEEZ NS-165 or the equivalent
CAUTION:
Never apply anti-seize compound to the protec-
tor 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)
IN-00203
(B)
(A)
FU-02734
3) Install the under cover.
4) Lower the vehicle.
5) Connect the connector of front oxygen (A/F)
sensor connector and fasten the harness with clips.
FU-02735
FU(H4SO)-32
(A)
(A) Front oxygen (A/F) sensor
(B) Rear oxygen sensor
(B)
(A) Front oxygen (A/F) sensor connector
(B) Rear oxygen sensor connector
FU-02735
(A)
FU-02734