One problem related to gas recirculation valve (egr valve) has been reported for the 2001 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Hyundai Sonata based on all problems reported for the 2001 Sonata.
I was driving along and the engine shut off suddenly. Crank shaft sensor failed three separate times in this vehicle. Once at 32,000 miles. Nearly lost control around a 90 degree bend. Second time occurred June 9th, 2005 at 83,000 miles after turning off a highway. Third time it occurred was July 15th, 2005. I was idling and attempted to put it in drive to proceed forward. I had it towed twice in three days to dealer. Each time, the sensor was replaced. The last two times the crank blade was also replaced. None of the times did I expect there to be any problems with driving the vehicle. Now I am worried a lot. The second time, I could tell it was happening since the rpm needle dropped to zero and then it shut off.