why not just take the EGR valve off and then clean it out with carb. cleaner and put a vacuum on it to make sure the vacuum section controls the valve.... then you can blow into one end to see if the valve really closes or stays open when you want it to... and there are test you can do on a DPFE or any sensor for that matter with a plain old multimeter/volt ohm meter.. i downloaded a operating manual from the web site for Sunpro by actron III digital multimeter, but the instructions can be used with just about any multimeter.... go to
www.actron.com and look up manual on the left side of the screen for actron products, multimeter... its about 36 pages long i PDF format.. you need acrobat reader to view it.. hope this helps... i need to check out the DPFE on my 93 taurus, getting the bad codes for that also... but it should work on any dpfe sensor...
