Your engine generates an excessive amount of heat, and it’s the task of the coolant system to absorb and control all of that unnecessary energy. Engine coolant levels sensors detect the amount of coolant in your system to make sure you have enough to operate safely. If these parts go bad, you often face one of two problems. Firstly, the sensor may not operate in any respect, leaving your coolant levels a complete mystery. Secondly, it could malfunction and detect low levels when you have an adequate supply. Possible consequences of driving with a faulty sensor include engine overheating and permanent damage, so it’s important to replace bad coolant levels sensors as soon as you notice a problem.