Marc b i was found something interesting for you.AL 98 that you have with MDI hour meter means automatic updates of the hours of the hour meter with the hours in the combi and solution for this says wait for one minute.I was have this when i was do clear eprom with diagnostic just on the first start up but not after that.Are you change MDI?Is it your connection on MDI ok?This is not block error but it is not normal for MDI to update hours every time when truck start.
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