VAG cars have been scannable (starting out with OBD1) since 1990’s.
It also works on non-VAG vehicles, but is limited to generic OBD2 system of Engine and Transmission. Hence it’s a diagnostic software that will diagnose vehicles with VAG engines, meaning it covers nearly all Audi, Volkswagen Seat and Skoda models. And VCDS is the Windows based software that is developed by RossTech – which uses this Interface to log into car’s ECU diagnostics computer. So when you shove your foot down, there's a sudden demand on the injectors, they cram loads of fuel in and if the turbo hasn't quite woken up yet, you'll get a momentary rich condition, nothing to worry about.Ok, first of all what is VAG-COM or VCDS? VAG-COM is a cable Interface that plugs into the car’s OBD port. It takes time for the turbo and injectors to react to inputs. I've had turbo engines for years and hardware is rarely instant. I've followed standard GTIs and ED30s and even they throw out a puff of black when you boot it.
To be honest, I have yet to see a 100% soot free TFSI exhaust. Too much smoke can mean an excessively rich AFR request from the map, poor atomization (bad injector(s)), boost leak, bad MAF or EGT failsafe map shoving loads of fuel in because it thinks the engine is about to go into meltdown. Got a momentary small puff of black then it clears up, otherwise it's a pretty clean exhaust Mine has a 'custom' map but the only time I've noticed black smoke was when hovering on the edge of boost for a while waiting for an overtake - say 3500rpm in 4th or 5th - and then nailing it.
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