Quote Originally Posted by BillBoost37 View Post
If you aren't interested in deleting or shooting in the dark, we can take a minute and learn what the code really means. Because it's common when you get a flow issue with an EGR that it's not the valve. Which means deleting the valve isn't fixing the root of the problem and your motor may pay the price down the road.

GearChatter.com :: View topic - DTC P0401 Exhaust Gas Recirculation (EGR) Flow Insufficient

Take a read into the diagnostic aids.

What I get from the link is this..
Check the map sensor and it's vacuum connection. Because...that's how the EGR flow is read by the pcm.
Check that egr to lim tube that always has a crack in it around the edge by the LIM. Ok, 80% of the time. Ask me if you don't find a crack and I'll describe better where it's located.
Your talking about the metal flexible tube from the EGR to the intake right? I had it off last night and never noticed any cracks in it. Also what kind of seals/gaskets need to be on each side?