Subaru IMPREZA 2002 Service Manual page 477

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENG I NE (D I AG NOSTl CS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
Check
Does the Subaru Select Moni-
tor or OBD-ll general scan tool
indicate DTC PO136?
Yes
Inspect DTC
PO1 36 using "List
of Diagnostic Trou-
ble Code (DTC)".
<Ref. to
List of Diagnostic
Trouble Code
(DTC).>
NOTE:
In this case, it is
not necessary tc
inspect DTC
PO1 39.
EN(S0HC)-77,
No
Replace the rear
oxygen sensor.
<Ref. to
Front Oxygen
(A/
F) Sensor.>
FU (S0HC)-43,
EN(S0HC)-153