My car wont start in park for about a year ive been starting it in neutral. on 1990 Mercedes-Benz 300E

Now its sometimes wont start in N I read that it possibly is a sensor on transmission where would that sensor be located?

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2 answers
You may have a problem with a switch and it could be an easy fix. Our $90 diagnostic fee will be waived with the repair.
Park, Neutral safety switch, located on the drivers side of the transmission.