Hi Just had the same problems on my A6
New battery was fitted, but erattic idle control still happened. Remover idle control valve, mounted on side of intake manifold by 2 5mm cap head bolts. Just cleaned it with brake cleaner and compressed air to blow out the debris and refitted and HEY idel control again, both hot and cold conditions.
Have had funny events with sunroof though, but will wait a while now new battery is fitted.
Hope this helps..
PS Do not try and start the engine with this unit disconnected, Best to complete all the work with the battery disconnected.
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