Scania CSS DTC 439 Ignition circuit, driver’s airbag.

CSS Crash Safety System · Scania

Code 439 (decimal). Some diagnostic tools show it in hexadecimal as 01B7.

In short

The resistance in the ignition circuit is too low.

Applies to: CSS1

What does Scania CSS fault code 439 mean?

What causes Scania DTC 439?

What are the symptoms?

How to fix Scania CSS fault code 439?

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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.