Subaru Legacy 2002 Service Manual page 1389

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (DIAGNOSTICS)
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK EXHAUST SYSTEM.
NOTE:
Check the following items.
¼ Loose installation of front portion of exhaust
pipe onto cylinder heads
¼ Loose connection between front exhaust
pipe and front catalytic converter (RH side)
¼ Damage of exhaust pipe resulting in a hole
Step
Is there any other DTC on
display?
Is there a fault in exhaust
system?
EN(H6)-182
Check Yes
Inspect the rel-
evant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H6)-87, List of
Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC
P0153.
Repair exhaust
system.
No
Go to step 2.
Replace front oxy-
gen (A/F) sensor.
<Ref. to FU(H6)-
43, Front Oxygen
(A/F) Sensor.>