Scania EMS DTC 551 Post injection ontime too long, cylinder 7.

EMS Engine Management System · Scania

Code 551 (decimal). Some diagnostic tools show it in hexadecimal as 000227.

In short

The error is detected when the post injection ontime, for either post1 or post2, has been consequtively too long for a period of time.

Applies to: EMS10

What does Scania EMS fault code 551 mean?

What causes Scania DTC 551?

What are the symptoms?

How to fix Scania EMS fault code 551?

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 551 in other Scania systems

Compare code 551 in every system →