Sensor light for coolant levels on 2001 Buick Century

How much does it cost to replace a sensor light? A red light has come on my dash stating coolant is low, check coolant. The coolant was checked and it was okay, not low

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1 answer
The coolant reservoir sensor may just be stuck. I would try flushing out the coolant reserve tank to free up the sensor, if that does not work, you can get a new sensor from GM for about $50.