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Home › Subaru › 2017 › Legacy 2.5i › Repair and Diagnosis › Engine Performance › System › Engine Control System (Diagnostics) (P0171 To P0685) (H4DO) › Diagnostic Procedure with Diagnostic Trouble Code (DTC) › DTC P0604: Internal Control Module Random Access Memory (Ram) Error › General Driving Cycle

General Driving Cycle

Perform the diagnosis as soon as the ignition switch is turned to ON.

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