Do you mean engine wont start or wont turn over (cannot spin)?
SOURCE: I have an Audi A4 that will not start. It cranks,
jumped timing belt even by 1 or 2 teeth can cause this, try a compression test - if bad on all cyls then the belt may have jumped, or the v v t tensioner on the rear of the cams is jammed and not coming up under oil pressure while cranking, this throws the valve timing out also.
SOURCE: 2005 Audi A4 1.8 Fuel Pump problem?
I had an Audi A4, 10 years older than yours mind you, but it would start then stop, sometimes 10 times but would eventually go. I ran a little WD40 in the key barrel and put the key in and out a couple of dozen times. Wiping it with a cloth each time, lots of dirt came off. My theory and it's only mine, is that the wear on the key left dirty metal deposits inside which stopped the chip in the key being recognised. I believe they had a security chip inside the key.
Anyway after 6 months of this nuisance it never happened again after that. Fixed my problem and a lot of frustration. Maybe help you too.
SOURCE: could a low battery cause car alarm to activate
the alarm system for audi/vw/seat/skoda is based on power drop,so yes is the answer and you need to reset alarm system/remotes if you replace battery or disconnect it for any reason not forgeting the radio code...
Testimonial: "Thanks, very helpful info, Battery fully charged, alarm is now working properly ."
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Do the injectors have power and ground pulse ?
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