it's been a couple of thousand miles and my CEL hasn't come back on.
TRY THIS BEFORE YOU TAKE IT TO THE DEALER

take off your IACV. from there you should be able feel the hole where the EGR pipe is connected to. when I first touched the hole a big piece of carbon came off, I'm guessing this blocked the EGR pasage somewhat and caused the error code (which BTW indicated insufficient/exccesive flow of EGR). i sprayed a lot of TB cleaner in the area, cleaned the TB while I was at and problem solved.

one thing that scared me was when I started my car it started very roughly and ran rough for a few minutes. i also got cylinder misfire error code that I did not have before..BUT i reset the ECU and no error codes to this day.

hope this helps, i think this is much easier and cheaper than going to the dealer or replacing parts.