Scania fault code 4157
Code 4157 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Pressure in the SCR system
The pressure in the SCR system is implausible in comparison with the atmospheric pressure.
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DDU
Loudspeaker in left-hand door, short circuit to earth
The DDU control unit interprets a short circuit to earth for the loudspeaker in the left-hand door.
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