Subaru LEGACY 2006 Manual page 168

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK THERMOSTAT.
Check
Is any other DTC displayed?
Does the thermostat remain
opened?
EN(H4SO)(diag)-131
ENGINE (DIAGNOSTICS)
Yes No
Check DTC using Go to step 2.
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4SO)(diag)-
70, List of Diag-
nostic Trouble
Code (DTC).>
NOTE:
In this case, it is
not necessary to
inspect DTC P0125.
Replace the ther- Replace the
mostat. <Ref. to engine coolant
CO(H4SO)-17, temperature sen-
Thermostat.> sor. <Ref. to
FU(H4SO)-19,
Engine Coolant
Temperature Sen-
sor.>