Thanks for the table, and the link to the pdf. I tested the system today and cmae up with codes 4, 5, and 17. Does anyone have any idea what these mean? I think that code 4 refers to a bad mass air sensor, 5 could be the O2 sensor, and 17 I have no clue about.

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1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500