I have used that technique on Volvos as they often get in a no start mode with a bad sensor. That has never been the case with MB. I don't know if you would call what Volvo does reverting to speed/density though, as they don't have a MAP sensor but MB will and in a debate I think the controller will default to the MAP.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician