Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi Sebastian, you will need to get the car connected to a Mercedes tester to read out the fault codes in the engine control module and the transmission control module. It sounds like either the transmission is malfunctioning, possibly due to a faulty speed sensor or low fluid or internal wear, or the throttle control system is malfunctioning, possibly due to a faulty throttle pedal position sensor or a faulty electronic throttle actuator. The fault codes will point to the specific problem.
Let me know if you have any questions.
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