my warning lights kicked on this morning so I tried to find somebody with a scanner but nobody I asked had one, so... I ended up buying one. code 0455 popped up... a possible cause: loose gas cap. I guess one of the local angels decided to goof around with my Jeep. good thing I locked it last night, I guess.
at any rate... I now own a OBDII scanner. just a basic one, but it shows the code numbers and can clear them. send me a PM if you need to use it.