like it is in the area? It sounds like it is coming from the rear wheel well on the drivers side. It is not on immediately upon starting the car, but seems to come on after I have been driving for a little while. Is there some kind of sensor noise or something that is an indicator of a problem? At first I thought it might be an indicator that something might be wrong with my brakes, but I had that checked out and the brakes are in good shape.