Engine Control Unit Variant Coding Help A-Class

Hello everyone,

This is a supplement to my report dated October 3rd: "Engine control unit defective after 600 km, injectors replaced."

Car: A-Class 170 cdi.
Year of manufacture: 2000; Vehicle identification number: WDB1680081Jxxxxxx.
Mileage: approximately 110,000 km.

We sent the defective engine control unit to a company known through this website for troubleshooting. They replaced the EEPROM. The authorized car repair shop reinstalled the engine control unit and informed us that it was not working. Subsequently, the device was returned to the company, which again detected faulty software. This software was then reset again. The company believes the error lies in an improper variant coding performed by the car repair shop.

The workshop is unable to perform a correct variant encoding.
We are now looking for someone who can provide advice before the workshop ruins the freshly repaired engine control unit again.

Thank you very much in advance to everyone .

Best regards,
Sure, here is the translation of the text from German to English:

"Elchi2000"

Hello,

Changing the variant encoding will prevent the EPROM from being erased!

Where is the car parked?

dieseltester wrote:

By changing the variant encoding, the EPROM cannot be destroyed!

I wouldn't be so sure about that! Maybe it's not electrically broken, in the form of burning out or short-circuiting. However, it is quite possible that it could become locked, which would mean "defective" for most people.

Hello, just to clarify something briefly:

We mainly wanted to ask if anyone knows how to reset the...
Adjusted the engine control unit to match the vehicle. The workshop seems to have done this.
for some reason, they don't really know. They supposedly can only...
Reprogramming the immobilizer, but that probably won't be enough.

Does anyone have any idea if a completely new engine control unit might behave differently?
Could it be that the standard software used in the workshop is still using the old control system?
not recognizing it correctly, or something along those lines?

Best regards,
Sure, here is the translation of the text from German to English:

"Elchi2000"