Need TO Clarify it is BAS ESP light, Found benz 170 slk class is same and that took me to SLK32 . Went to stability section and got nothing, but went to trans section and got " RIGHT FRONT WHEEL RPM SIGNAL SENT FROM TRACTION CONTROL SYSTEM VIA THE CAN BUS IS IMPLAUSIBLE. No code was given, ordered sensor and hopefully that will fix problem. So any how reader works on quite a few things gives on the fly motor and trans info which is interesting.