Scania fault code 4120
Code 4120 is used by 4 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
SCR control unit
Shorted to ground or damaged, from the sensor diagnostics
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DDU
Camera 3 activation, break in the circuit
Abnormal voltage, indicating an unconnected pin.
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EEC Exhaust Emission Control
Exhaust gas temperature sensor upstream of the particulate filter
The exhaust gas temperature sensor upstream of the particulate filter indicates incorrect values.
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LAS Locking and Alarm System
Remote control 5
The control unit detects that the remote control is transmitting a continuous signal.
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