Maybe someday the DIY section can start accumulating code info. There is a real problem with such. The code book from MB for model years to 1993 is 260 pages and those were the simple models with fewer control units and less internal diagnostics.
The ability to know which chart to use for each system/model is a skill all to its self.
Send me your email and I'll send a pdf doc on EA/CC/ISC.
Bosch Master, ASE Master, L1
33 years MB technician