P0401 FORD -

Question

I have a 1999 Ford F250 super duty V10 I am getting a P0401 code the truck is running rough when it warms up. I replaced the EGR valve and the DPFE sensor still having same problems any suggestions?

Answer 1

P0401 EGR gas recirculation flow insuffiecient,If you were to get excessive flow then yes this will explain the rough idle, But this code means there is no to litlle EGR,Go to the PCV you are dealing with a vacuum leak somewhere,