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    4. : What to do if the opening key of a Mercedes B-Class does not work?

What to do if the opening key of a Mercedes B-Class does not work?
Years 2011-2019

Answer

If suddenly the key of a Mercedes Benz B-Class car no longer works (so it does not open and close the doors and does not even start the car anymore) it may be due to the key battery being completely discharged.
Posted on: 21 August 2022 by ScegliAuto

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