Scania MBS DTC 840 Secondary temperature sensor for passenger area, implausible value

MBS MBS control unit · Scania

Code 840 (decimal). Some diagnostic tools show it in hexadecimal as 0348.

In short

The secondary temperature sensor for the passenger area displays an implausible value.

Applies to: MBS3 (MBS)

What does Scania MBS fault code 840 mean?

What causes Scania DTC 840?

How does the system react?

What are the symptoms?

How to fix Scania MBS fault code 840?

Read the full explanation with Premium

Causes, system reaction, symptoms and step-by-step repair instructions for every fault code are available to Premium members.

  • Full explanations of every code and brand
  • Causes, symptoms and repair steps
  • New brands and codes included
Get Premium – 7,50 € / month I already have an account

Yearly plan: pay 10 months, get 12. Cancel at any time.

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

Code 840 in other Scania systems

Compare code 840 in every system →