My 996tt airbag light stays on, when I start too quickly engine, I need usualy wait about 5 second, sometimes 15 seconds ignition ON position, then light turns off and after this hit starter.
In january there isn't such a problem.
It's annoying, mybe someone knows cure for this?

 

I know it seems unrelated, but check out the seatbelt connection. Sometimes they throw the airbag light.