Coolant temp sensor or airline.
I had the same problem, replaced the coolant temp sensor for £15 and reset the warning light. 2004 1.6 SE. I'll never go back to Audi for a service. They might as well wear balaclavas.
I still have some problems with the idling but I can live with it (or until I know the real reason) - After £100 diagnostic and me suggesting to them what it might be they said they could do nothing. Surely by the number of comments about the same problem it must be a known fault!
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