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Exhaust Gas Recirculation (EGR) System

Diagnostic Trouble Code (DTC) P0401 or P1406 indicates that there is a failure in the EGR system circuit. Refer to DTC P0401 EGR System Flow Insufficient or DTC P1406 EGR Valve Pintle Position Circuit. Refer to System Diagnosis / Diagnostic Charts for testing information. Testing and Inspection