threw it the cel on a couple week ago on the way to the show, code 401, 1998 3.0 with about 105 on the clock. Cleared the code knowing ti doesnt affect anything as its there for emmisions. Went on last week and cleared it again now it went back on tonight. I know I need a new one how much is this going to set me back?

They're not that expensive, about 50 bucks. You should probably replace the DPFE sensor as well (another $50).

yup its prob a defective DPFE sensor. was it setting a lean and rich code? also is ur dpfe sensor plastic or cast aluminum? if its aluminum u need to replace it cuz ford came out w/ a updated one that is plastic...