Subaru LEGACY 2006 Manual page 139

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
Check
Is any other DTC displayed?
EN(H4SO)(diag)-102
Yes No
Check the appro- Replace the mass
priate DTC using air flow and intake
the "List of Diag- air temperature
nostic Trouble sensor. <Ref. to
Code (DTC)". FU(H4SO)-25,
<Ref. to Mass Air Flow and
EN(H4SO)(diag)- Intake Air Temper-
70, List of Diag- ature Sensor.>
nostic Trouble
Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC P0101.