Like everyone else on this forum, I have an P0401 CEL. After checking the modulator, I sucked on the tube to the EGR valve and the engine died, so I assume that the EGR valve works. I then felt the metal tube on the EGR valve and it was luke warm. I disconnected the line that runs from the EGR valve to the intake (I think the VSV line), held my finger over the EGR valve connector that I removed the line from, reved the engine for a while. The metal tube is now hot. EGR must be working now, or at least exhaust gas if flowing. I then sucked on VSV line at various engine rpm's and it always appears to be open. I am 90% sure that I have a VSV that is stuck open. Is there Anything else I should look at before giving C-Dan ~ $125 for a new VSV? Also, I really do not want to remove the intake and saw that there are a couple of success stories with using a 3' extension method. Does anyone have a link to a good thread? I tried searching and it is like finding a needle in a haystack. Finally, if I decide that this is too hard for me to fix, will the lack of EGR make the engine run too rich and fowl things up? Thanks in advance for your suggestions.