9E0004 Mercedes Fault Code :
Read the description of 9E0004 in ACM2TuEURO and the engine lights up for ACM2TuEURO TuEURO Aftertreatment Control Module code, there are some possible causes for it.
Signal cable Terminal 15 to component 17A03: Exhaust aftertreatment control unit (ACM) has Open circuit or Short circuit to ground.