Subaru Legacy 2004 Service Manual page 609

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
Check
Is any other DTC displayed?
EN(H4SO 2.0)(diag)-177
ENGINE (DIAGNOSTICS)
Yes
Check DTC using Replace the ECM.
the List of Diag- <Ref. to FU(H4SO
nostic Trouble 2.0)-34, Engine
Code (DTC). <Ref. Control Module
to EN(H4SO (ECM).>
2.0)(diag)-66, List
of Diagnostic Trou-
ble Code (DTC).>
NOTE:
It is not necessary
to inspect DTC
P1134.
No