Hi all. After some advice. For the last 2 winters i have taken a weeks holiday and left my 2008 A6 standing on the drive. Upon returning, my rear demister has stopped working and exactly 10 minutes into every journey the ESP warning light has come on (see owners manual) and stays on until engine is next turned off. Around March/ April the battery warning light has come on and the faults have reset themselves and been fine until December! I assumed this was due to an old battery (nearly 10 years). However, I have had the battery replaced today and the fault still remains. I wondered if anyone had any suggestions before the dreaded dealership diagnosis....
