Scania fault code 4220
Code 4220 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Charge air pressure sensor T122
The engine control unit indicates too high a voltage in the circuit for the charge air pressure sensor.
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EMU
Heater H39, low voltage
The heater is reporting a voltage below 450 V.
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DDU
External amplifier, overheating
Information is missing, update is in progress.
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