Subaru 2002 IMPREZA Service Manual page 371

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICSI
Y e s
Step
CHECK ANY OTHER DTC ON DISPLAY.
No
!
CHECK EXHAUST SYSTEM.
NOTE:
Check the following items.
*Loose installation of front portion of exhaust
pipe onto cylinder heads
*Loose connection between front exhaust pipe
and front catalytic converter
*Damage of exhaust pipe resulting in a hole
Inspect DTC
I
Check
Ioes the Subaru Select Moni-
or or OBD-ll general scan tool
idicate DTC P0031, P0032,
)0131, PO1 32, P1130, P1131,
V134 or P1139?
Go to step 2.
s there a fault in exhaust sys-
em?
P0031, P0032,
PO1 31, PO1 32,
P1130, P1131,
P1134or P1139
using "List of Diag-
nostic Trouble
Code (DTC)".
<Ref. to EN(D0HC
TURBO)-80, List
of Diagnostic Trow
ble Code (DTC).>
NOTE:
In this case, it i$
not necessary tc
inspect DTC
PO1 33.
Repair exhaust
Replace the front
system.
EN(D0HC TURBO)-147
oxygen (NF) sen-
sor. <Ref. to
FU(D0HC
TURBO)-42, Front
Oxygen (NF) Sen-
sor.>