Subaru FORESTER 2001 Service Manual page 310

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK ANY OTHER DTC.
Conduct troubleshooting for all DTC P0301,
P0302, P0303 and P0304. <Ref. to EN(DOHC
TURBO)-82, List of Diagnostic Trouble Code
(DTC).>
Step
Does failure for repair or
replacement exist?
EN(DOHC TURBO)-309
Check Yes
Repair or replace
failure, then
replace precata-
lytic converter.
Engine (Diagnostics)
No
Contact your
Subaru distributor.
NOTE:
Inspection by
DTM is required,
because probable
cause is deterio-
ration of multiple
parts.