X253 pre facelift with M274 (MED40) can be turned off directly in ME Variant coding with last mode or eco only.
Facelift with 9G shift and M264 (MED41) is different, no more last mode support, it's either on or off.
MED41 you have to do both ME, PTCU (CPC) and F_SAM (DRSAM)
In F_SAM it's the engine cover paq function has to be turned off. It's the logic of cheating system to fail self test required for StartStop function.
This applies to all MED41
You must meet ME, CPC and F_SAM all off codes to successful disable it.