Most new Toyota vehicles, model year 2003 and newer, come equipped with a tire pressure warning light that turns on when it senses a change in tire pressure. Tire pressures are most likely to fluctuate with rapid and drastic temperature changes, which in Vermont, tend to fall around the seasonal changes.
The TPMS, Toyota’s Tire Pressure Monitoring System, is installed on the valves of your tires and is designed to provide a low pressure warning for all five (that’s right, five) tires on your vehicle. The most common trigger for the warning light is low pressure in the vehicle’s spare tire. Most customers are unaware that their spare tire also comes equipped with a tire pressure monitor, and the TPMS is only installed on full-sized spares, not donut spares. The light may also turn on when a tire is punctured, warning you of a flat before it happens.
If you’ve checked all five tires and they’re all correctly inflated and there are no puncture marks, it is possible that your TPMS is damaged and/or malfunctioning. A damaged TPMS can be caused by improper inflation or damage during a tire mount and balance, most often when it is performed by a technician who is unfamiliar with the system. If you feel this is the case, make sure to call or stop by Heritage Toyota Scion and our staff will gladly diagnose the problem for you and if necessary replace the faulty sensors.