I have 2007 Santa Fe. The first problem I noticed was that when I press my remote controller to lock 2007 Santa Fe two times, it used to make the horn sound, but not any more now. And then a few days later, horn was not working any more. It can lead to very dangerous situation if horn is not properly working. When I searched it through internet, I found out 2007 Santa Fe has some airbag issues and had been recalled. Maybe airbag problem is connected horn problem somehow, because both are inside the drivers steering wheel.