One problem related to crankcase (pcv) 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.
The car was expertly maintained, followed the severe duty maintenance schedule. Never had a problem until 125,000 miles. Metallic debris in the crankcase caused the oil pump not to spray oil onto the connecting rod bearing causing a complete engine failure. This is the same thing that was recently recalled on the newer 2011-up theta ii. The theta I and theta ii are the exact same short blocks except for the theta ii's direct injection system. My mechanic who did the repair was very surprised since he always inspected my car annually and knew I used to be a mechanic and maintained all my cars like clockwork. The repair cost was $4,113. 53, see attached invoice. The existing recall should be for all theta engine since 2006-up not just for the 2011-up.