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P0401OBD-II Code

Understanding DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected

DTC P0401 indicates that the exhaust gas recirculation (EGR) system is not functioning properly, which can lead to increased emissions and engine performance issues.

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MODERATE
Content Type
Diagnostic Guide
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Diagnostic Information

DTC P0401 is triggered when the Engine Control Module (ECM) detects insufficient flow of exhaust gases through the EGR system. This code is categorized as a moderate severity issue, meaning it should be addressed promptly to avoid further complications. Common causes of this code include a clogged EGR valve due to carbon deposits, a faulty EGR valve, blocked EGR passages, a malfunctioning EGR pressure sensor, or a vacuum supply problem to the EGR valve. Diagnosing the exact cause requires a thorough inspection of the EGR system components and their connections.

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