One problem related to timing tensioner has been reported for the 2012 Kia Motor Optima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Kia Motor Optima based on all problems reported for the 2012 Optima.
My engine sounds like a truck ,I took car to kia dealer ship and they claimed it was it was serpentine belt tensioner loosing tenion and ideler pulley bearing . Said they fixed these problems but I'm still have the same problem,and said there was no recall on my car. But there is a problem with the the one I bought.