after having a service the spanner symbol and 'service due ' sign are still there, the mechanic who done the service does'nt know how to get it off, can anyone help please. looked earlier on this site and someone suggested a 1 2 3 stages . turn milage back to zero re progamme maintenance due etc but it is still there, the car has'nt got a ignition key just a knob you turn ( like one on a gas hob) HELP ?