What does code P0401 mean?
Insufficient EGR flow detected by ECU
OBD-II Code
P0401 — Exhaust Gas Recirculation Flow Insufficient Detected
Insufficient EGR flow detected by ECU
Common symptoms
- Rough idle
- hesitation
- increased NOx emissions
Possible causes
- Clogged EGR valve
- carbon blocked passages
- faulty DPFE sensor
Initial recommendation
Clean EGR system, inspect vacuum and flow sensors.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0401 with your vehicle's actual symptoms for more complete diagnostic guidance.
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