Hey Pat,

I took mine to a guy here in Austin whose shop works on Mercedes and other high end cars. Has over 50 years of MB experience working for him. They cleared all of the codes out of the computer, drove the car down the street and it pinged the same code it had in it before.
They're tellin me it's my right rear speed sensor which is an OEM part so off to the Benz dealer I go ! Second time this a week ! Hope this doesn't become a habit
I'll post my results in the next day or two ! Thanks for the good wishes !

Just my Dos Centavos !