Now and again I notice that my traction control warning light on my dash is coming on without me disabling ESP. It usualy happens when I am on a particularly bumpy road or if I hit a nasty pot hole. If I switch the ignition off and back on again everything is fine. Is this an indication of a faulty sensor somewhere or the start of a more serious problem? Any help or advice would be much appreciated. My S3 is a 2000 model if that helps. Thanks.