The TPMS is Tire Pressure Monitor System what that is , is basically if your tires are low on air the sensor knows that and the tpms light goes on telling you till put air in your tires. Also when you get a flat tire it goes off obviously but when you put the spare on it stays on because there is no sensor for the donut. When it is cold as vinnie the tires can lose air "pressure". Our elantras i haven't had my light turn on but my car is always outside and in jersey it does get cold. Bigger vehicles such as trucks and suvs are more prone to it because there bigger and heavier. i know this because my moms Suvs have had that Ford expedition and dodge journey and Honda CRV the tpms light has turned on but after driving the tires warm up and it goes off.
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