My new RS6 (I only got it last week so its new to me), has a weird habit of putting the emission control warning light and/or the engine management light when you first switch on

. If you then press the test button twice to run a test on the car's systems, you get OK come up. It doesn't do it all of the time, just occasionally. It has also displayed the red brake warning symbol but then if I follow this up with the test button, the car is fine.
I've also hooked it up to an OBD tester which reports no logged fault codes and the car seems happy enough.
Has anyone else come across this? I'm convinced there is nothing wrong with the car but its just weird. It doesn't go into limp mode or anything.
Cheers

Daytona Grey RS6 with Miltek stainless exhaust and Bilstein coilovers, magic tree air freshener.
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