One problem related to starter has been reported for the 2007 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Hyundai Sonata based on all problems reported for the 2007 Sonata.
One morning on my way to work, I placed the key in the ignition switch and tried to start the vehicle, but it would not start. I turned the key over several times and it finally started up. This happened on several different occasions whether I was at home, work, or anywhere in public. I thought it was the starter based on my experience with other vehicles and I was going to have it replaced. Then I started having issues getting into the car. I would try to unlock the driver's door with the key and it would not unlock the first time. I would have to unlock it again (essentially unlocking all of the doors) and then they would lock. I also started having issues locking the car doors from inside the car. I would press the lock switch on the driver's door and all of the doors would lock except for the driver's door. It only locks if I manually push the lock switch. I decided to research the issue so I went and read some online discussion boards. There were hundreds of people who had the same issue and I figured that perhaps it was a bad sensor so I took the car to a Hyundai dealer. I asked them to diagnose the problem and they came back and said that the electrical system needed to be replaced. They told me that eventually I would not be able to use the key and that I might not be able to get in the car or start it again because of this issue. On a separate issue, whenever it rains water gets in the trunk gate. When I lift the trunk gate up water comes running down into the trunk. I have had to lift it up one quarter, then half way, then three quarters way allowing water to run down along the track and out of the trunk gate. If I am luck only a handful of water ever makes it into the trunk.