The idea behind it: car thieves put the coin there at night. If a driver opens his car in the morning and - because he is driving alone - does not look at the passenger door, he drives off. If he then locks the car again and leaves, the car actually remains open. Why? Because the coin supposedly
blocks the mechanism of central locking.
A coin in the door handle blocks the central locking. When later you lock the car, you hear the "snapping" of the central locking, but the passenger door does not close properly. The car is still open on the passenger side.(remains unnoticed)
Be-ware!!
