I own a 2003 Sorento and I also have had the same problems with the headlights. I don't know what replacement number I am on, I think it is about the 6th one and have to get another one today. Also, the interior light has quit working. Also, the air bag light has been on for over a year. The check engine light will come and stay on for a little while and go off and not come back on for months.
I love the SUV, I just really hate the problem with the headlights!
You own a KIA, you are GOING TO HAVE ISSUES!!! GUARANTEED!!
That airbag light you have on means in an accident that air bag is NOT going to deploy, the system is disabled. May God be with you in an accident!!
Check to make sure the connecters to the headlight are not corroded. Replacing the light may help for a while as you may wear away a bit of the corrosion. Either that or check the voltage going to the affected lights.
About the airbag not deploying if the airbag light is on. My 94 Nissan Altima airbag light was on for about a year. I had a head on with another vehicle, the airbags deployed. By the way she was a great little car in the snow. Only thing I didn't like about it was the headlights did not illuminate the road ahead very well.
Has anyone done a check on the electrics without taking it to a garage. All you have to do is first check the bulb with an ohmeter, then check the plug to see if you have hydro and to see if you are getting a power surge at the connection.
I am thinking on buying a 2003 Sorento, but these light issue's sound too annoying, even though all in all it seems to be a better truck than most.