I had the code read at Autozone for free a while back and the code came up P0401 - Insufficient flow to egr valve. One of the people on this site (sorry i forgot who) recommended changing out the DPFE sensor because the egr doesn't normally fail it is usually the sensor. NAPA was running a sale this weekend so I purchased the sensor and installed. It only took my about 20 min and a 5/16 socket to change. VERY EASY INSTALL #1 on a 1-10 scale. I then reset the computer (battery trick) Check engine light is gone. Thanks guys saved me a bundle!

Silver Bullet