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My truck about a year ago was doing the exact same thing throwing code P0401 - I ended up first changing the egr valve. About 2-3 days later the code came back so I cleaned the tube leading from the exhaust manifold with a long tube cleaner. 2-3 days later the code again. So I then replaced the DPFE sensor which sounds like you also changed. Still 2-3 days later the code was back on. My truck didn't run any differently so I figured it can't be too bad. I finally got my hands on the Factory Service Manual and it had the test procedure for determining what part was bad. It ended up being the vacuum selenoid that puts vacuum to open the egr valve. I changed it out and haven't had a problem since.
Silver Bullet
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1998 F150 Silver 4WD Styleside V6 Reg Cab 3.55 RE - 285/75R16 Cooper Discoverer AT's on stock rims, Extang soft cover, Rhino step bars, exposed K&N air filter with retainer ring, Steel Horse Brushguard with 2-100W KC Daylighters, Superchip, black wind deflectors, AVS headlight covers, 29" Cherry Bomb glasspack, sliding rear window.
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