This comment probably comes…
This comment probably comes a bit late, but maybe it could be helpful to someone else? Did you happen to keep your paperwork each and every time you took your vehicle to the Kia dealership? Often the paperwork will contain the problem you stated that you are having. Of course, the paperwork might also say that "nothing was found." I would look up the Kia Corporate Office and their official address. I would write them a letter in detail regarding this problem. Be sure to let them know that you had this problem from DAY ONE of owning this vehicle. I would also attach all that paperwork (copies), if I have it, and a copy of the paperwork where you were charged $190 for the diagnostic (and any other fees they charged you if they fixed it). I would let them know that you found it very strange that the dealership ONLY found the problem AFTER the warranty expired. Kia needs to fix it free of charge since you have tried several times during the warranty period to have it repaired and this Kia dealership just basically looked the other way, that is, until the warranty was up. If you can't receive the assistance you need from Corporate, then, perhaps, a complaint to the State Attorney General's Office is merited.