Subaru Legacy III (2000-2003 year). Manual - part 240

FU(H6DO)-44

FUEL INJECTION (FUEL SYSTEMS)

FRONT OXYGEN (A/F) SENSOR

B: INSTALLATION

1) Before installing front oxygen (A/F) sensor, ap-
ply anti-seize compound only to 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 front oxygen (A/F) sensor.

Tightening torque:

21 N·m (2.1 kgf-m, 15.2 ft-lb)

3) Secure harness to clip (A).
• LH side

• RH side

4) Install under cover.
5) Lower the vehicle.
6) Connect connector of front oxygen (A/F) sensor.

7) Connect battery ground cable.

FU-00589

FU-00590

FU-00587

( A )

FU-00588

( A )

EX-00056

LH side

RH side

FU-00009

FU(H6DO)-45

FUEL INJECTION (FUEL SYSTEMS)

REAR OXYGEN SENSOR

16.Rear Oxygen Sensor

A: REMOVAL

1) Disconnect battery ground cable.

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

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

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

CAUTION:
When removing, do not force rear oxygen sen-
sor in an unnatural way especially when ex-
haust pipe is cold, otherwise it will damage 
exhaust pipe.

B: INSTALLATION

1) Before installing rear oxygen sensor, apply anti-
seize compound only to threaded portion of rear
oxygen sensor to make the next removal easier.

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

Anti-seize compound:

SS-30 by JET LUBE

2) Install rear oxygen sensor.

Tightening torque:

21 N·m (2.1 kgf-m, 15.2 ft-lb)

3) Connect connector to rear oxygen sensor.

4) Lower the vehicle.
5) Connect battery ground cable.

FU-00535

EX-00058

FU-00591

FU-00591

EX-00058

FU-00535

FU(H6DO)-46

FUEL INJECTION (FUEL SYSTEMS)

ENGINE CONTROL MODULE

17.Engine Control Module

A: REMOVAL

1) Disconnect battery ground cable.

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

4) Remove protect cover.

5) Remove nuts which hold ECM to bracket.

6) Remove clip from bracket.

7) Disconnect ECM connectors and take out 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.

FU-00009

FU-00514

FU-00593

FU-00594

FU-00595

FU(H6DO)-47

FUEL INJECTION (FUEL SYSTEMS)

MAIN RELAY

18.Main Relay

A: REMOVAL

1) Disconnect battery ground cable.

2) Remove lower inner trim of passenger side.
<Ref. to EI-39, REMOVAL, Lower Inner Trim.>
3) Disconnect connectors from main relay.
4) Remove bolt which holds main relay bracket on
body.

B: INSTALLATION

Install in the reverse order of removal.

FU-00009

FU-00441