Exhaust Gas Recirculation Flow Insufficient Detected on BMW
BMW
Verified1 source
1 source
- Official data (NHTSA)official_feed
What P0401 means
Caution — monitor closely
Less EGR flow is occurring than the system commands.
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Exhaust Gas Recirculation Flow Insufficient Detected
What to check first
- Inspect EGR passages for carbon blockage
- Test EGR valve actuation
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