One problem related to oil pump has been reported for the 2006 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Hyundai Sonata based on all problems reported for the 2006 Sonata.
I heard really loud sound in the engine but there's no check engine light. After of few days of driving and the day I decided to bring it to the mechanic, few miles away from the shop the the loud noise in the engine is gone then check engine show up and the oil pan appears. The mechanic said it was the oil pump and they said there's a metal shaving inside the engine, when they drain the engine oil.