Remember that if the light never goes out after starting, then there is a voltage supply problem.
If the light comes on while driving & goes back out when starting then the problem is a sensor.
The charging system also is important to system operation.

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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