hi, i need your help i have a s500 coupe w140. it will not start. its getting fuel ,spark and a new engine wiring harness... the fault code is showing as follows... 24, fuel injector circuit short or open... all earths have been checked as well as the injectors.... it has been nearly four months now , my technician cant work it out... i also had the ecu checked, this is also im told to be fine.. thanks