Two problems related to timing tensioner have 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.
Timing chain tensioner want it replaced.
The issue is the tensioner for the timing chain. The tensioner failed, causing a very expensive engine repair. There is a recall on the 6 cyl tensioner, but not the 4 cyl which I have. My research says the same tensioners were used for both engines. It failed at 169,000. It was stationary in a parking lot when it failed to start. It would turnover but would not catch. I have all the damaged parts saved by the mechanic. If I was driving when it failed, it would have not only blown the engine but most likely would have stopped my car on whatever road I was driving on, including an expressway.