Hi Peeps, so my a3 1.8T had been going great until about 2 days ago when I decided to give it some beans and take the old girl for a little belt around. Well when I was on my way home pulled up at some lights and when in neutral the idle was dropping very low and the engine nearly cutting out, then when I accelerated the revs were lagging/hesitating. I should mention 1 month ago I had the engine light come on and when I had it diagnostic tested the fault was Lambda sensor. The guy reset it and said see how it goes (as the car was driving fine still). So I had it in the garage today, they ran VCDS VAG/VAS emulator (diagnostic test i guess) and i was expecting to need a new Lambda sensor or 2 to be honest. But to my surprise they said they found nothing major apart from nothing was talking to the ECU as in it was in some weird mode, default mode! Anyway, they told me everything has been reprogrammed and calibrated and charged me 90 pound. I did ask what had actually been done as I was worried all they did was plug it in and push a button! The car seems to be running fine as before again and no problems so far, I will see how it goes in the morning and the rest of the week. Do you think they really done something that was worth the money???? Can you reset/ adjust the idle from the VAG software??? Any advice or info would be great. I will try take a pic of the diagnostic test and post it too for any of you who can understand this stuff!