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Had this same problem last year. AA couldn't diagnose (didn't try actually). Battery was tested ok, turned out it was a faulty exhaust camshaft de-fazer solenoid, WeverTF that is! Anyway 80 well spent quid to my clever local back street specialists and back on the road in no time!
Thanks all - only this morning somebody asked if they could 'borrow my Audi' :rolleyes: but I guess we all get that, and personally I'd always choose a car that's more individual anyway.
Tbh I had some long standing engine problems that main dealers wanted to strip the car down to investigate...