I have a 2004 Audi S4. After I start it and drive it for a little while the traction control light seems to come on and stay on. Shutting the engine off and turning it back on makes the light disappear but it eventually comes back on. Any ideas what this may be/how much it's going to cost to fix?
So far from what I've read it seems to be the ABS wheel speed sensor but I'm not sure if that's necessarily it.