Can anyone help I got a 99 a4 1.8t and got a knocking noise when I go over hate bump or pothole ?? Any ideas it's seems only to be drivers side? Maybe a bush or mount ? Just got a4 from having a a3 1.8t before so don't know much about common probs with the a4 would appreciate any help on this one? Also where is Ecu box as need to put a amp wire through but was told go through Ecu??