Scania fault code 4191
Code 4191 is used by 2 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMU
Refrigerant compressor E157, internal fault
The refrigeration compressor reports too high a temperature in the transistor (above 95°C for 5 seconds). The fault code may expire by itself, the refrigeration compressor updates…
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DDU
Switch module in the steering wheel for instrument cluster: Back button, no signal
Information is missing, update is in progress.
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