I had a similar problem on my Audi a4 2.0 fsi 53 plate. Loss of engine power and warning lights on etc. but really intermitent and turning engine on / off cleared fault for a short period. Took to garage who also said they couldnt definatley say what it was but suggested changing the NOX sensor (£600) I went for it as I was away from home and needed to get back. It seemed to clear the fault completly although I have since had a tensioner go and completly write off the engine, but thats another story....
Chris
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