engine coolant light always on, normal running temp on gauge and fluids ok on 1992 Mercedes-Benz 300E

Is it a faulty sensor?

Asked by for the 1992 Mercedes-Benz 300E
it can be the sensor in your cooling tank that is not reading right.
1 more answer , 1 more comment
Probably the coolant level sensor. Located in the expansion tank. A new sensor is around $30.00 and not too hard to change. If you simply unplug the sensor the light should go out. Otherwise there may be a short to ground further up the wire harness.
You were spot on as well as Answer #2. Thanks again from Enthusiast in San Diego..