Vibrations can come from all manner of things, wheel imbalance thrown a weight or flat spot on tyre or damaged wall, suspension mounts, engine+gearbox mounts, anti roll bar mounts, wishbones lower mounts, drop links, steering rack and idlers, there can be others that you would not think can do this and these are clutch thrust bearing or plate spring. rear wheel drive prop shaft mounts, exhaust and mounts, automatics can be the torque converter out of balance. also can be worn bearings on the wheels. you would need to find were the location of the vibration starts and pin down its area this can help with another pair of ears in the vehicle.
SOURCE: I have a vibration in the front drivetrain on my
Wear (on a bearing or a pivot) combined with a slight bad geometry on the front suspension and a slightly unbalanced wheel: at lower speeds or very high ones the vibration is too weak to be felt thru the steering. When you turn the wheel the slight transversal force generated is pushing the wheel and the gap generated by the wear is closed so the vibration stops.
Lift the front of the car and move the wheel on all directions. When you have identified the loose wheel ask somebody to move it for you while you feel around it for the part that has the play/gap/wear. Replace that part.
SOURCE: Audi A4 ESP light comes on and car shakes/vibrates strongly
I am dealing with this issue with my 2003 a4. The Esp Is your tractioon controll, which is tied into your Abs system. Your Brake light Circuit is also tied in, so. Check your Brake Fluid, all Rear Bulbs, then look into Abs wheel speed sensor. $100 bucks each. The yaw sensor is unlikely culprit, but the ESP Controll module which is located under glove box is most likely the suspect.<!-- from fixya rte -->
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