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Home › Mazda › 2003 › MX-5 Miata Base, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0401: Exhaust Gas RECIRCULATION System Insufficient Flow Detected › Possible Causes

Possible Causes

EGR boost sensor malfunction.
EGR boost sensor solenoid valve malfunction.
EGR valve base gasket improperly installed.
EGR valve malfunction.
PCM malfunction.