Scania EMS DTC 817 Knock sensor

EMS Engine Management System · Scania · 2 variants

Code 817 (decimal). Some diagnostic tools show it in hexadecimal as 0331.

In short

Knock sensor 2 produces deviating value.

Variant 1

Applies to: EMS S7

What does Scania EMS fault code 817 mean?

Knock sensor 2 produces deviating value.

What causes Scania DTC 817?

Knock sensor 2 defective.

How does the system react?

The engine's torque is reduced to protect the engine. There is a risk of misfiring.

How to fix Scania EMS fault code 817?

  1. Check the component, harness-to-harness connectors and electrical cables.
  2. Renew the knock sensor.

Variant 2

Applies to: EMS S8

Detection

Knock sensor 2 produces deviating value.

Possible cause

Knock sensor 2 is defective.

System reaction

The engine's torque is reduced to protect the engine. There is a risk of misfiring.

How to fix

  1. Check the component, harness-to-harness connectors and electrical cables.
  2. Renew the knock sensor.

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

Code 817 in other Scania systems

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