Scania EMS DTC 4809 Exhaust gas aftertreatment

EMS Engine Management System · Scania · 2 variants

Code 4809 (decimal). Some diagnostic tools show it in hexadecimal as 12C9.

In short

No communication with NOx sensor T115 downstream of catalytic converter.

Variant 1

Applies to: EMS S8

What does Scania EMS fault code 4809 mean?

How to fix Scania EMS fault code 4809?

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.

Variant 2

Applies to: EMS S8 (S8PDE)

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

Code 4809 in other Scania systems

Compare code 4809 in every system →