I had the same problem both of it. the yellow light indicates that your tyer pressure not stable, sometimes means your air inside your tyers might too hot. you can try pump up all your tyers first. second turn off your engine, turn your key to the first place than keep pressing the button under the handbrake wait for maybe 1 min, than turn on your engine to see is it solved. I solved my problem with this way.
Airbag light, two possible problem, 1. your air bag has been used..but seems not your case, coz your car haven't been crashed right? so 2 which is the circuit problem, just use go your local garage ask them to deel with it, I think just 40 pounds can be solved.
hope this could help!!