Subaru Legacy III (2000-2003 year). Manual - part 35

FU(H4SO)-42

FUEL INJECTION (FUEL SYSTEMS)

FRONT OXYGEN (A/F) SENSOR

5) Connect the battery ground cable to battery.

FU-00009

FU(H4SO)-43

FUEL INJECTION (FUEL SYSTEMS)

REAR OXYGEN SENSOR

15.Rear Oxygen Sensor

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Lift-up the vehicle.
3) Disconnect the connector from the rear oxygen
sensor.

4) Apply SUBARU CRC or its equivalent to the
threaded portion of rear oxygen sensor, and leave
it for one minute or more.

SUBARU CRC (Part No. 004301003)
5) Remove the rear oxygen sensor.

CAUTION:
When removing the oxygen sensor, wait until 
exhaust pipe cools, otherwise it will damage ex-
haust pipe.

B: INSTALLATION

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.

CAUTION:
Never apply anti-seize compound to protector 
of rear oxygen sensor.

Anti-seize compound:

SS-30 by JET LUBE

2) Install the rear oxygen sensor.

Tightening torque:

21 N·m (2.1 kgf-m, 15.2 ft-lb)

3) Connect the connector to the rear oxygen sen-
sor.

4) Lower the vehicle.

FU-00009

EX-00030

FU-00198

FU-00199

FU-00198

EX-00030

FU(H4SO)-44

FUEL INJECTION (FUEL SYSTEMS)

REAR OXYGEN SENSOR

5) Connect the battery ground cable to battery.

FU-00009

FU(H4SO)-45

FUEL INJECTION (FUEL SYSTEMS)

ENGINE CONTROL MODULE

16.Engine Control Module

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the lower inner trim of passenger side.
<Ref. to EI-39, REMOVAL, Lower Inner Trim.>
3) Detach the floor mat of front passenger seat.
4) Remove the protect cover.

5) Remove the nuts (A) which hold ECM to the
bracket.
6) Remove the clip (B) from the bracket.

7) Disconnect the ECM connectors and take out
the ECM.

B: INSTALLATION

Install in the reverse order of removal.

CAUTION:
When replacing ECM, be careful not to use the 
wrong spec. ECM to avoid any damage to the 
fuel injection system.

Tightening torque:

5 N·m (0.51 kgf-m, 3.7 ft-lb)

FU-00009

FU-00315

(A)

(A)

(B)

FU-00316