THE CAR: About 393,000 Hyundai Sonata midsize cars from the 2006 through 2008 model years.
THE PROBLEM: Investigators from the U.S. National Highway Traffic Safety Administration are checking into six complaints that the rear suspensions can rust and crack, causing the control arms to fail. A car's wheel hubs are attached to the control arms. The problem could lead to drivers losing control of the cars.
THE SOLUTION: None yet. The investigation could lead to a recall. Hyundai says it's cooperating and that no safety defect has been found.