Scania EMS DTC 4421 Coolant temperature sensor, unexpectedly low value

EMS Engine Management System · Scania

Code 4421 (decimal). Some diagnostic tools show it in hexadecimal as 001145.

In short

The control unit has interpreted the value from the coolant temperature sensor as lower than expected.

Applies to: EMS10

What does Scania EMS fault code 4421 mean?

What are the symptoms?

How to fix Scania EMS fault code 4421?

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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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