The low coolant light will come on with only a slightly low coolant level. It will go off when the coolant gets warm enough to start circulating. Your coolant could indeed be low. When my low coolant sensor failed, under warranty, they replaced the whole tank, saying that the sensor was not available by itslef. I do not know if that is still the case. Now that my car is out of warranty, if the sensor fails again, it gets disconnected. I have been capable of checking my own coolant since I started driving back in 1964.
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