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you need the right software and a multi use ob2 reader. pro scan 5.9 will read the system but you need the right ob2 tool for it to read. there is this site that may help you. http://www.micro-tronik.com/mercedes_benz_diagnostic_software_13.html
sorry but this vehicle is american with a auto gearbox and i have no experiance of this vehicle or the auto box ,ours in europe are nearly all manual boxes.Now is vehicle engine turning over and not starting or is the inhibitor switch stopping the starter from turning
The MR code comes up because you are not allowing the vehicle to do the self checks before trying to start engine, it therefore does not regognise the key in the ignition and the immobiliser is activated. to overcome this allow the vehicle to do its self checks and when the neutral N symbol is shown then turn ignition switch to start.