hello guys and gals. I have a 2000 c180 estate in blue. I have had an issue that the abs and bas lights are on. I have changed the abs speed sensor, the hub and the abs pump but have had no joy. I am thinking that it can only now be wiring related. the car works fine, gears are selected ok, it reads speed ok it just has the little yellow light on. am I missing something simple?[X(]