One problem related to engine exhaust system has been reported for the 2011 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Hyundai Sonata based on all problems reported for the 2011 Sonata.
I was on the highway about 25 miles into my drive home from work started hearing a faint noise kind of like an exhaust leak. Within 2 miles it was getting louder so I started thinking my exhaust was disconnected or something. I get out of the car and see just a little smoke from the hood. Within a minute I noticed there was more smoke so I looked at the front grill and saw small flames. Called 911 but took them over 10 minutes to get there so car was completely destroyed. Car had 98500 miles and showed no signs on any issues. I had all the recalls done and Hyundai passed the car for a recall that caused engine issues and fires. Hyundai has an open investation and I am working with them. From what I can tell they have a major issue and most of these cars have the issue right around the 100k mark. I feel this just might keep happening and Hyundai really should do something more to fix this issue.