Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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With the start and stall as well as the key getting stuck and the not authorized fault this does sound like a fault with the ignition switch itself.I have seen the ignition switch fail/act up like this here before in the past and had to replace it for this issue here.I would have the fault code fully diagnosed that had come up when it was checked as it will lead to the component needing replaced.I do suspect this is the ignition switch itself needing replaced or a fault with the ignition cylinder needing replaced.
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