Scania fault code 4178
Code 4178 is used by 7 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Exhaust gas temperature sensor upstream of SCR catalytic converter T113
Several hours of low exhaust gas temperature, resulting in high hydrocarbon levels in the aftertreatment.
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EMU
Heater H39, internal fault
The control unit indicates a fault in the heater.
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EMD
Engine shutdown
The quantity of unburnt fuel in the exhaust gas aftertreatment system is too great. The exhaust gas temperature has been low for several hours.
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EME
Engine shutdown
The quantity of unburnt fuel in the exhaust gas aftertreatment system is too great. The exhaust gas temperature has been low for several hours.
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EMO
Engine shutdown
The quantity of unburnt fuel in the exhaust gas aftertreatment system is too great. The exhaust gas temperature has been low for several hours.
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DDU
Loudspeaker in right-hand door, short circuit to earth
The DDU control unit interprets a short circuit to earth for the loudspeaker in the right-hand door.
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ICL Instrument Cluster
General yellow warning
Internal fault. General yellow warning does not work.
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