Subaru 2002 IMPREZA Service Manual page 1479

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODE (DTC).
Conduct the troubleshooting for all DTC
P0301, P0302, P0303 and P0304. <Ref. to
EN(TURBO)-75, List of Diagnostic Trouble
Code (DTC).>
Check
Does failure for repair or
replacement exist?
EN(TURBO)-319
ENGINE (DIAGNOSTICS)
Yes
Repair or replace Contact with your
the failure, then Subaru distributor
replace precata- service.
lytic converter.
NOTE:
Inspection by DTM
is required,
cause
cause is deteriora-
tion of
parts.
No
be-
probable
multiple