Scania OCS DTC 59904 Charge air temperature sensor T121 downstream of the throttle

OCS OCS control unit · Scania

Code 59904 (decimal). Some diagnostic tools show it in hexadecimal as 00EA00.

In short

Voltage too low in the charge air temperature sensor circuit.

Applies to: OCS1

What does Scania OCS fault code 59904 mean?

Voltage too low in the charge air temperature sensor circuit.

What causes Scania DTC 59904?

Short circuit to earth.

How does the system react?

The torque is limited. A yellow warning indication is displayed.

What are the symptoms?

The fault affects engine performance. The vehicle is difficult to start or cannot be started.

How to fix Scania OCS fault code 59904?

  1. Check the charge air temperature sensor, harness-to-harness connector and cable harness.
  2. Renew the charge air temperature sensor.

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