I can shed a bit of light on this, I had this happen a couple months back.
Basically from what my shop told me, the airbag light is extremely touchy, and generally comes from the sensors in your seats which tell your airbag controller which bags to fire off in an accident. The connectors under your front seats are a weak link, and often need to just be unplugged, replugged, and vag'd to get it fixed (my shop also ziptied both airbag sensor wires to seat rails to keep them oriented in a certain manner).
So you should likely take this to a shop, my little local audi shop fixed this for free, but in the absence of that get it done at your stealership
Bookmarks