TT_Vert

I replaced the DPFE to fix the P0401. no CEL for 500 miles, today get a P0402. I took the egr off again and inspected the pasages and gaskets to the EGR. They were clean and EGR seals fine. I applied vacuum to egr while car is running and it died (good). I checked vacuum to the EVR (EGR valve regulator) and i see 19 hg/in. I ensured the hard plastic line from EVR to EGR holds vaccum (no leaks) Any ideas what could cause this? Is it possible the EGR gaskets are leaking? Excessive flow means what exactly? I know the EGR is not opening at idle as I tested the vacuum source to it. What exactly does excessive flow mean? When is the flow excessive?

Thanks
Dave

Johnny Mullet

Are the hoses to the DPFE sensor dry-rotted or split anywhere? Carefully inspect the DPFE hoses.

TT_Vert

the soft silicone looking hoses look like new. You are talking about the 2 or 3 inch hoses right?
Dave

taurus guy

It normally means you need a new DPFE sensor if no other symptoms are present. You could try returning yours and get another one or if you have the old one, put it back on and see if you get the P0402.