Traction Control System Related Problems of the 2007 Hyundai Santa Fe

Traction Control System problem

2007 Hyundai Santa Fe - may 27, 2010 I was driving on the interstate at 65mph when the passenger rear wheel locked up causing the car to fishtale - as I moved over in to the slow lane, it fishtaled again. The dealer it was towed to said it was the yaw sensor which they replaced. I informed them at that time that the ecs off light had been coming on to which they replied it had nothing to do with the yaw sensor I called the week of July 4th to let the dealer know that the ecs off light came on again - they informed me that this has been a problem for many Santa Fe's and they needed me to come down (150+ miles one way) to hook it up to see what the code tells them. On July 19, 2010 driving 75mph on the interstate, both rear wheels locked up and there were no brakes. This car is a danger to my life!.