Scania APS DTC 4129801 Rear service brake circuit

APS Air Processing System · Scania · 2 variants

Code 4129801 (decimal). Some diagnostic tools show it in hexadecimal as 3F0409.

In short

The pressure sensor for the rear service brake circuit indicates no values.

Variant 1

Applies to: APS2

What does Scania APS fault code 4129801 mean?

What causes Scania DTC 4129801?

What are the symptoms?

How to fix Scania APS fault code 4129801?

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Variant 2

Applies to: APS2

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