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Make sure you are checking the coolant level in the radiator as well as in the overflow tank. The sensor is located in the radiator, so if the level in the overflow tank is good, it could still be low in the radiator.
Check your radiator fluid level and the fluid level in the Overflow tank. Make sure the radiator is full and the over flow bottle is filled to the full mark. After doing this if the light continues you will need to locate and replace the fluid sensors.
Sounds like your sensor unit in your coolant overflow tank. Like nearly everything man made that floats, they will eventually leak (become water logged). This is a relatively cheap fix, as long as the light is coming on and the coolant level in the overflow tank is between the MIN and MAX lines in the overflow tank. This means that the float in there is dropping below the actual fluid level (watter logged) and you need to get a replacement sensor unit (aka sending unit) for the overflow tank.
Otherwise, if the coolant level in the overflow tank IS BELOW the MIN level line on the tank, then you are losing coolant somewhere and that is when things start to get expensive (might be a radiator problem, head gasket, cylinder head, heater core, etc).
Inside the surge tank is a float that turns on the "low coolant" light. As the float gets gummed up it gets stuck in the low position. I've had good luck in cleaning the surge tank out really well and ungummed the float so it slides up and down like it should.