Have been fighting the same problem for over a year and getting nowhere. Have contacted Hyundai Customer Service and have a case open. Dealer and Hyundai rep' have not been able to duplicate the problem so, in their opinion, it does not exist. I keep getting the "If we can't duplicate it we can't fix it" line. I have asked Hyundai to take the car back and they refuse to unless they can duplicate the problem AND are unable to fix it.

PLEASE, if you are having this problem report it to Hyundai Customer Service, get a case number, and post it here. Then, report it to the NTSB...This is a MAJOR safety issue. If there are enough reports we may get someone's attention. If nothing else, having other case numbers will take away Hyundai's "I've never heard of that problem" excuse.

 

My Tucson, a 2006 2.7 V6 is acting strange, not stalling but the ESC light and the hesitation and the bad idle. At first it was a 0430 code for the downstream oxygen sensor. That got replaced and then a few days later, 0420 and 0430 came up. Catalytic converter I guess. I was wondering if the hose was loose at the MAF sensor, would it throw those codes I would hate to have to replace the converter, I think it is way expensive. So bumping this one again.