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Hmm - with the car in Economy (Efficiency) mode, when you throttle off the car goes into coast mode effectively putting the gearbox into neutral allowing the car to free wheel at what should be tick over engine speed. With the gearbox in neutral there is no drive back through the geartrain from the wheels to maintain engine idle. This could be where the issue sits. If it were me with the Audi overalls on I would be looking at sensors and settings around engine idle control. The next question would be does the fault happen in Auto drive mode? I tried all drive modes when I first got mine and it sits in Auto Drive Select most of the time now with no perceivable difference in economy. I concede this is not a fix but could be a work around of sorts

You would need to program the key. 443mhz is just the frequancy that the transponder sends signal.. standard for most keys

Welcome to the forums Nice friendly atmosphere here with plenty of Audi owners to help where they can. Please be sure to give the forum rules a quick view Paul

Welcome to the forum Sean, you'll find the members on here are a friendly and helpful bunch :) Cheers Steve