Bad hesitation from a standstill or while accelerating at speed.
Service Engine light is on almost all of the time, with EGR malfunction code.
Had to be towed to dealership three times due to stalling (and would not restart).
This is, hands down, the worst new car I have ever purchased. Some of my complaints revolve around poor dealer service, but I also believe that this car was cursed from the moment design had begun.
Each time the car has been returned for service due to an engine service light, I've been told that the gas cap was not tight. I even purchased an OBDII code reader and had to prove all of my complaints to them.
The first time it was in for service (at 6 months of ownership), the dealership did $2000 worth of damage to the driver's side door, but did, however fix the damage after 1 month.
From the first day we bought it, the car has handled like a drunken water buffalo, has horribly long stopping distances, and was hesitating so badly that it almost caused 2 accidents. To the credit of Hyundai, their website gave me enough information to diagnose the hesitation and provide a patchwork fix (reflash the computer memory from the driver's seat)
The trick with hyundai is very simple...
The second that you see a sign of poor dealership...
Take your car and get it out of there...
Read the reviews of all hyundai cars... most of their problems are due to crappy dealerships...
Funnyest one was an elantra with tranny oil for engin and engin oil for tranny lol.
In my honest opinion, the Hyundai XG-300 may rank as one of the top 10 worst foreign cars ever made. It would take a book to point out all the flaws, but suffice it to say they are primarily electrical in nature. This has caused me grief in car stalls, hesitation, dieing and stopping. I have had it towed 3 times. The check engine light has been a permanent companion over the last two years, confounding my yearly attempts to get the car inspected. Each time the mechanics would read the fault code; fix the electrical problem (and mind you no repair less than $500) and 24 hours later the light would come back on. It is as if every electrical item connected to the engine is failing in sequence. The after-market for parts is non-existent; therefore, all parts must come from dealerships. Mechanics also appear to be charging much higher prices for labor. To date, I have paid 50% of what I paid for the car with no end in site. For the life of me, I cannot understand why some car-makers know how to make cars that work and others seem to be clueless. I would be shocked if anyone out in the world would say they have owned this car and had little to no problems. Because of this experience I would not ever consider buying another Hyundai or for that matter, any car product from Korea. That may be a harsh generalization, but in my world, one gigantic strike on my pocketbook from a car and that company is out.
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