My abs light comes on from time to time, as far as I can tell the only consistency is that it does it sometime while driving. What are typical causes of this? I had thought it might have been something to do with the fact that I was long overdue to change my breaks, but after changing them I still catch the light. On rare occasion I see the traction control light, odd considering I have it turned off through my handheld tuner. Could the sensors just need cleaning?