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Ford P0401 Code – Insufficient EGR Flow
Limited
Safe to drive :
Ford vehicles only
Applies only to :
Not applicable to :
This explanation does NOT apply to Toyota, BMW, GM, VW, or other manufacturers.
Medium
Severity level :
When Does This Code Appear on the Vehicles
Ford P0401 appears when EGR flow is insufficient and may cause knocking or rough idle.
What This Code means on the Vehicles
On Ford vehicles, P0401 indicates insufficient exhaust gas recirculation flow.
Why This is different from a generic OBD2 Code
Ford EGR systems commonly clog with carbon, triggering this code.
Common Situations That Trigger This Code
Carbon buildup; Faulty DPFE sensor; Stuck EGR valve.
What Will NOT Fix This Code
Replacing catalytic converter; Clearing code without cleaning passages.
How to Clear This Code on Vehicles
Clean EGR passages, test DPFE sensor, clear code.
Related Manufacturer Specific Codes
Ford P0402; Ford P1400
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