Just recently bought a 2013 A5 4 months ago and I'm having an electronic problem that the dealer won't recognize to fix. I just need to understand how to fix this EPC problem. Car has fairly new batteries.....can unlock car , all interior lights and exterior lights works, etc but it won't crank at all. it registers EPC on the dashboard. Would hate to send it to shop if this is a DIY that I can do at home so I can get this car on the road. Please advise! Thank you!