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Home >> Subaru >> 2003 >> Forester XS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 2.5L >> Diagnostic Tests >> DTC P1134: Front Ho2S Micro-Computer Problem >> Diagnostic Procedure
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Diagnostic Procedure

Perform basic diagnostic procedure. See BASIC DIAGNOSTIC PROCEDURE . If any DTCs other than P1134 are present, diagnose those DTCs first. Do not diagnose DTC P1134. If only DTC P1134 is present, replace ECM and test system operation.

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