Please Help

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They actually started out as two different questions, that is why. Sorry if I have offended you???? As as regards to Autozone I thought I read that you just had to give them your Driver's License or somethign to borrow the code reader for a minute. I know that they will not just hand it to you, I'm not a friggin moron. But thank you for your oh so helpful post.
 
Ok so I got the code read, it was P0401 - EGR Flow Insufficient Detected
That was the only code that showed up. Now why do I think that this is the DPFE Sensor (which went bad once already at 5,000 miles), now 33,000 miles later why do I have a feeling its bad. Also, would this cause my "diesling" or "rattling" noise? Anyone have any hints or help for me? If this wouldn't cause the noise I guess its an exhaust leak, but it only makes the "noise" when the engine is under load. If i put it in park or neutral it wont do it, but if I go to power brake it, it will. Please Help.