After changing the battery on my 2002 1.8T A4 Quattro 2 weeks ago the ESP light came on as expected then cleared after a couple of minutes driving. Now its coming on for a few days, then off, etc, when ever it feels like it?? There is no change in the performance of the car as far as I can tell. Any Ideas?? The car seems to be getting into the Festive spirit as I've now more lights on my dash than a fecking christmas tree............ Cheers.