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I got this the second time now within 3 months. Do I need to get a new EGR valve or where may this code come from. Where is the flow actually detected and how?
Have you tried anything with it yet?
I figured it's easier to ask than to go look at all your old posts
The most common problem that causes the P0401 is the DPFE sensor but you could have a bad EGR valve or plugged ports in the intake etc.