After some advice, I have a 210bhp S3, mapped by angel tuning (although I think this is irrelevant, I was sitting at some traffic lights when the car started running on 3 cylinders, after about half a 500m I managed to pull over and saw the engine light was on. I turned the car off and tried to restart but it wouldnt start at all.
I have power as the engine will turn over but does not fire. Asuming it was electrical I had the car transported to my mates garage for diagnosis, he has tried his own scanner and 2 other from neighbouring garages but they dont pick up any faults.
I know coil packs are common on these but they have been replaced under warranty and surely all four would not go that quickly, would this bring an ECU light on?
Would VAG.com bring up something that these other scanners are not picking up?
My guy at the garage is convinced it would be a cam sensor or similar but I dont want to take the route of replacing parts to diagnose the fault!
Anyone else had this happen?