Scania fault code 4166
Code 4166 is used by 3 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Air pressure in the SCR system
The difference in air pressure before and after the restriction valve during metering is lower than expected.
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EMU
Refrigerant compressor E157, high temperature
The refrigerant compressor reports too high a temperature.
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DDU
Tweeter on left-hand A-pillar panel, break in circuit
The DDU control unit interprets a break in the circuit of the tweeter on the left-hand A-pillar panel.
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