Scania fault code 4491

Code 4491 is used by 4 different Scania systems. Choose the control unit shown in your diagnostic tool:

EMS Engine Management System Safety valve The engine control unit calculates that less air is coming into the engine than what is measured by the mass flow sensor. The adaptation of the mass flow sensor has at some operati… Read explanation → EMD Safety valve The safety valve has been triggered. Read explanation → EME Safety valve The safety valve has been triggered. Read explanation → EMO Safety valve The safety valve has been triggered. Read explanation →