There seem to be several folks who report errors when trying to connect the OBDII scanners to MB cars. In addition, my local Auto Zone says they can't scan my car because it's a Mercedes (I know this isn't true).

Can someone tell us why the OBDII scanners are having trouble interfacing with the MBs?

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2003 Hyundai Santa Fe, Silver
1999 C280 Sport, Black
1997 Ford Escort, Toreador Red