Porsche, Lexus, Toyota top J.D. Power dependability study Here are the auto brands that showed the fewest problems after three years of ownership Check out this story on USATODAY.com: http://usat.ly/2m7RP8t Here are the models that J.D. Power designated as being the most reliable, based on the 2014 model year. We start with Midsize Sporty Car: Chevrolet Camaro The 2014 Lexus RX was one of the vehicles that topped the J.D. Power U.S. Vehicle Dependabilty Study Lexus and Porsche are the auto brands that showed the fewest problems after three years of ownership, though technology troubles continue to drag down dependability ratings overall, a new survey from research firm J.D. Power finds.