My traction control switch light go on when I'm driving What should I do

Hello, Unfortunately, this will require diagnosis be a trained technician. There is a good chance that the ABS controller is faulty, but that component needs to be diagnosed before spending hundreds of dollars on a part. Scan the car and post the codes, and let's get you in the right direction. If you have other questions, or need more information, let me know, otherwise, here is a list of certified shops in your area with the training to repair your vehicle: http://repairpal.com/lexus-within-10-miles-of-bridgeport-connecticut-06604