At least 5-10 times. The coolant level & w/washer reservoir sensor are in series & if either sensor has a short or open circuit the coolant level warning will come on. Try disconnecting the w/washer sender & watch the MIL lamp come on.

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MERCEDES BENZ MASTER GUILD TECHNICIAN
ASE MASTER TECHNICIAN
27 YEARS DEALER M.B. Shopforeman
190E 2.3 ITS RACECAR
1986 190E 16V