Originally Posted by jay_bob

Generic OBDII scanner only gets the emissions related codes (per Federal law). Everything else is MB proprietary and can only be retrieved by Star DAS. Except for the climate control stuff, that can be accessed by an Easter Egg in the control panel.

BAS/ESP things to check:
-Brake pedal switch
-K40 relay (in the control box under the hood, the device with the fuses). Check the fuses then try swapping the K40. These are known to have cold solder joints.

I haven't had to play much with the vacuum system on the W210, I'm sure someone else who has experience will be along soon.