My 99 Expedition has the ABS light on and the garage I took it to says the code indicates a faulty rear wheel speed sensor. Fine! But I also get this horrific noise from somewhere on the drivers side too. The mechanic said it is from that sensor. How does a sensor cause noise. It sounds almost like I'm dragging a metal basket. It is not a solid noise and happens only once in a while. It doesn't sound like something scraping under the car or metal on metal. Any clues????????