I haven't checked for codes. I didn't think I could on an MB... I haven't checked a code since my POS GMC van in the mid-90's...

Can it be done w/o some ridiculously expensive Bosch tester?

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress