I have the ABS, Traction Control, Hill Decent lights on. When this first started they would be on about 50% of the time. Now they are on all the time. I'm fairly certain it's one or more bad wheel speed sensors. Any advice on how to test the wheel speed sensors? I saw a Kia youtube video where an ohm meter was used to check the resistance across the terminals on the wheel speed sensor plug. I've also seen other videos where the voltage was checked across the terminals as the the tire was rotated.