The exhaust gas recirculation system is not flowing enough exhaust gas.
Informational only. Consult a qualified mechanic.
Clean or replace the EGR valve and passages.
The P0401 OBD-II diagnostic trouble code (DTC) indicates: egr flow insufficient. This is a low-severity powertrain code that your vehicle's onboard diagnostics system triggers when the exhaust gas recirculation system is not flowing enough exhaust gas. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
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