where on the transmission is the turbine in put sensor is location

it likely is not the speed sensor, but an issue in the "electrics plate" that it is part of. drain trans fluid, remove filter, remove valve body and there is the electrics plate ($250 at the dealer). install a new filter, new pan gasket and new MB only fluid. you will need the special dipstick "tool" to check the fluid level because your car does not have a dipstick. after all is done, you will need the MB software to clear these codes and reset the trans adaptation. then test drive and recheck fluid level.