1998 F-150 CODE ?

had the same code with my truck, auto zone said o2 sensors, paid close to $300.00 bucks, for sensors, and labor, less then 50 miles the light comes back on, I carried it to the ford dealer, and they put it on their computer, it was a vacuum leak, replaced a rubber fititng on the back of the intake, runs like a new truck, and that was five hundred miles ago o and it only cost me $90.00 at the ford place Good Luck

Thanks for the advice TOMMY-N-KRISTI I had a look tightened a few things up now i will have to wait and see if the light comes back on. Air breather clamp was almost falling off and a couple hoses were kinda loose.