Flat battery. was cleaning mine with the stereo cranked I also forgot I had it parked in the shade with the lights on auto needless to say my batt went flat, had the exact same prob freaked out until I jump started it and all the codes disappeared.
hey names john jus bought me an FG xr6 turbo, I love it its heaps of fun. im in gladstone at the moment and would be keen to learn more about these as it is my first xr6 turbo. cheers.