P0401 question

KRBissonnette

New member
So my friend has a 1998 Ford Windstar and asked if I could see why the check engine light was on since I have a scanner. Three codes came up and one was the P0401 which means the EGR valve flow is insufficient. Now the Fords also have a DPFE sensor, so how will I know which is defective? Should I start by just cleaning the EGR valve and tubes and see how it runs after that? The van does have a rough idle and occasionally stalls which makes sense if the valve is clogged or defective. I've never attempted this kind of job before so it would be great to have some advice (aside from saying to drive that van off a cliff lol) :p
 
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