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A bad sensor gives an inaccurate reading of the temperature of the critical antifreeze/coolant in an auto/truck engine. The sensor sends a message to the gauge and may "show" no reading or it may show a "Pegged hot reading".
If the gauge doesn't show any change from the time you start the engine through the first 5 minutes of operation it is likely bad. there may or may not be overheating happening, most engines run fine without a functioning sensor, but you just won't know if you are operating in the too hot range.
Operating an engine "too hot" for even short periods will damage it quickly.
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