Scania EME DTC 258 Intake air mass flow sensor T126

EME EME control unit · Scania

Code 258 (decimal). Some diagnostic tools show it in hexadecimal as 0102.

In short

The voltage in the circuit has been below the permitted level.

Applies to: EME1

What does Scania EME fault code 258 mean?

The voltage in the circuit has been below the permitted level.

What causes Scania DTC 258?

- Short circuit to ground. - Power failure.

How does the system react?

The engine control unit switches off the EGR circuit. The engine power is reduced. Applies only to vehicles with Euro 5: The fault code cannot be cleared when it is active.

How to fix Scania EME fault code 258?

  1. Check Mass flow sensor.
  2. Note: Always carry out a default setting of the mass flow sensor adaptation values if the mass flow sensor has been renewed, or if leakage in the engine intake system has been rectified.
  3. Applies only to vehicles with Euro 5: If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler as there is a risk that condensed water will form in the air-cooled EGR cooler when the EGR system has been switched off.
  4. Drain the EGR cooler according to the instructions in the Workshop Manual, subgroup 01-65.

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

Code 258 in other Scania systems

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