Scania EMS DTC 4166 Air pressure in the SCR system

EMS Engine Management System · Scania

Code 4166 (decimal). Some diagnostic tools show it in hexadecimal as 1046.

In short

The difference in air pressure before and after the restriction valve during metering is lower than expected.

Applies to: EMS S6

What does Scania EMS fault code 4166 mean?

What causes Scania DTC 4166?

How does the system react?

How to fix Scania EMS fault code 4166?

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This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

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