I was having issues with exhaust sensor readings incongruent one reading lower than the other, Mechanic plugged it into his high tech diagnostic computer, he said dpf issue, look into dpf delete, having researched this found that all the dpf deletes have been removed from the internet EPA ? My CEL kept coming on again and again then I started going into limp mode, but stopping and restarting would reset, this on went on for months, then CEL stopped coming on but limp mode came on more frequently and even while I was driving. finally took it to the dealer for Regen at $142. It is now running fine , feels different, I am hopeful will post if anything else surfaces.