Dont know if this is a common problem but my cars (2007 S3) hasnt been drove for 4 days, and earlier i went to drive and when i started it. it come up ESP fault, see user manual. the ESP light stays on. However on thursday i drove it and it was fine and wasnt up? the book doesnt say much info and i want to avoid taking it to audi if its something minor. any help much appricated.