Its your TPMS
Tire Pressure Monitoring System
Basically if the light comes on when your driving then it means that one of your tires have lower pressure then what its set at. But if you hold it down long enough it resets the sensors and sets it at the PSI its at right now which you probably dont know. Best bet is to check the pressure in each tire and make sure its at the correct level then reset the TPMS so you wont have any false alarms.
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