EMS 4491 Scania Safety valve

EMS Engine Management System · Scania · 3 variants

Code 4491 (decimal). Some diagnostic tools show it in hexadecimal as 118B.

In short

The engine control unit calculates that less air is coming into the engine than what is measured by the mass flow sensor.

Variant 1: Leak between the compressor and intake manifold or fault in the mass flow sensor

Applies to: EMS10

What does Scania EMS fault code 4491 mean?

What causes Scania DTC 4491?

How to fix Scania EMS fault code 4491?

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Variant 2

Applies to: EMS S7

Variant 3

Applies to: EMS S8

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

Code 4491 in other Scania systems

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