The scraping noise *could* be the dust cap spinning. It is supposed to be captured tightly between the hub and the rim of the wheel when you mount the tire. You really do have to lift the car and spin the tire while you look for the area of the noise. Could be the cable hitting the side of the tire. Could be the angle drive dying. Could be (very unlikely) the Lambda counter. If it is the dust cap, a wrap of electrical tape around the circumference should keep it from spinning. It could mean the angle drive (or the cable) needs lubrication because it is "locking up" and getting difficult to turn making the dust cap spin.
David Teitelbaum