On the 2013 Hyundai Sonata, the recommended tire pressure for this vehicle is 33psi. If you find that there is a tire which is under-inflated, fill the tire and then drive the vehicle. The light should reset itself in under 10 minutes. If the light does not go off and you are sure all tires are at correct pressure, then there is a problem in the tire monitoring system somewhere. Very commonly, this is a faulty Tire Pressure Sensor. The pressure sensor is mounted inside the tire as part of the valve stem assembly. Unfortunately, a scan-tool that can read the outputs of these sensors will be needed to determine which is faulty- if that’s even the case, there are many other parts/sensors in the monitoring system. If the Tire Pressure Sensor is not faulty, the scan-tool can read the diagnostic trouble codes and point you in the direction of where the problem lies.
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