Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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If the lights come on when trying to start usually this can indicate the key is o.k.
The fault here may be an issue with a faulty brake switch.If the brake switch is not sending the correct signal on whether the brake is pressed or not this will cause the no crank/no start intermittently like you see here.The other component I have seen act up can be the starter itself intermittently not engaging needing replaced.
What will have to be done from here is to have the fault codes read out/checked with a fully compatible scan tool to see what codes are set.Once this is done any codes set will need diagnosed to help locate and repair this issue here.I suspect brake switch possibly or possible starter.There is a chance this is the ignition switch itself but not as common as the other two components listed here.
Being a 2014 model this may still be covered under factory warranty to be diagnosed and repaired at no cost to you from a dealer.
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