Scania fault code 4172

Code 4172 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:

EMS Engine Management System NOx sensor downstream of the catalytic converter The quantity of nitrogen oxides measured differs from what it should be. Read explanation → EMU Heater H39, secondary transistor, electrical fault The control system has measured current of over 500 mA while the PWM signal to both heating elements is low. Read explanation → DDU Tweeter on right-hand A-pillar panel, short circuit to voltage supply The DDU control unit interprets a short circuit to voltage supply for the tweeter on the right-hand A-pillar panel. Read explanation →