Although some batteries last much longer, most batteries begin breaking down chemically after four years, so you could experience dimmer headlights and other negative effects before you have a dead battery in your A4 Quattro that you need to replace. We recommend changing the battery in Audis every 4 years. The video above shows you how to replace the battery in your 2009 Audi A4 Quattro.That is fine with me - but I didn't write anything new, then what DV52 had already written - I only set up the steps in a more readable way.
But just to explain how it works on an A4 B8: Thanks, but we really don't want VIM instructions here in this forum. Enabling Audi MMI hidden menu - SD CARD Script method First of all you have to download script from here! See also these VIDEO TUTORIALS for VW Golf Mk4: How to remove VW flip key blade in 4 steps! How to replace / change Audi, Seat, Skoda, VW key fob in 11 steps! How to find PAINT CODE on a VW Golf Mk4 in just 10 seconds! How to repair door lock cylinder on Audi, VW, Skoda, Seat in 3 steps! Turn off the engine and disconnect the VCDS cable.