Scania fault code 4121
Code 4121 is used by 4 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
SCR control unit
Internal sensor diagnostics
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DDU
Camera 1 supplementary voltage supply, short circuit to earth
Information is missing, update is in progress.
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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 6
The control unit detects that the remote control is transmitting a continuous signal.
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