Scania OCS DTC 79140 Lambda sensor T137

OCS OCS control unit · Scania

Code 79140 (decimal). Some diagnostic tools show it in hexadecimal as 013524.

In short

The sensor temperature is too low.

Applies to: OCS1

What does Scania OCS fault code 79140 mean?

The sensor temperature is too low.

What causes Scania DTC 79140?

Fault in the lambda sensor, harness-to-harness connectors or cable harness.

How does the system react?

A yellow warning indication is displayed.

What are the symptoms?

The fault affects engine performance. It is difficult to start the engine. Engine emissions are affected.

How to fix Scania OCS fault code 79140?

  1. Check the lambda sensor, harness-to-harness connector and cable harness.
  2. Renew the lambda sensor.
  3. Renew control unit OCS E103.

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