Settings wont change

[BlackC55]

Not all can be done. Some coding is permanent. It's weird but I have seen quite a few now that won't accept the MPH change no matter what I do.

 

[Shellboie]

Not all can be done. Some coding is permanent. It's weird but I have seen quite a few now that won't accept the MPH change no matter what I do.

Yeah I believe that MB have done something on more recent models, i think 2003- 2009 are ok on w203's, however, i am no expert.