The day I got my Adam the yellow tyre picture light came on. I blew the tyres up but the light stayed on. Took back to the salesman and he got it fix within 5 minutes. Apparently each tyre has a battery operated sensor inside the tyre connected to the valve. They're very sensitive.
As long as your tyre looks OK take the car back to your dealer and hopefully they'll sort it. Mine have been fine since.