My out of warranty and out of motorplan vehicle has a noisy problem and this has caused the dashboard to turn yellow with all the warning lights likely related to the speed sensor (affecting abs, cruise control and tyre sensor). The one mechanic after a rigorous road and lift test suggested it was a differential (diff). I understand used parts are available for the F30 320i automatic. The noise and the shaking has become unbearable that I am scared of driving my car especially when there is a turn (left turns are the worst) as the sound gets worse.