Three problems related to engine knocking noise 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.
Vehicle in motion on freeway in rush hour traffic, speed varying from 0-30 mph. Engine spontaneously began making loud metallic knocking noise when accelerator was pressed. No engine warning light activated. Mechanic found no loss of oil pressure. Front end disassembly showed metal bits in the oil pan. Engine considered to be unsafe to drive due to threat of fire. Cause believed to be crankshaft bearings.
The engine started making metallic clicking and knocking noises about a week ago. I took it to my mechanic and by then it started squeaking and squealing. He said it was catastrophic engine failure and asked if I had ever let it run out of oil, which I never did. When driving to my mechanic, lost a lot of power on an entrance ramp to highway and almost got in an accident. My mechanic never seen in an engine with < 200,000 miles unless an oil event, so he believes this was due to a manufacturing defect. It is interesting that the 2011 and 2012 Sonata was recalled for exactly this type of issue as well. I wonder if the problems were also existing on previous year models, such as the 2007 model.
Was driving to work and heard loud knocking sound under the bottom. Took it to tuffy auto and was told engine is losing oil badly. They noticed because I had just had the oil changed 3 weeks prior. Was told need new engine.