When I bought this car ('08 9-3 sedan) the light for the front right side tire pressure was on. No problem, I filled it up and the light went away. Two weeks later, today, the light came back on, the tire looked full, I measured the tire pressure, and it was actually greater than that of any other tire. So my question is, can the sensor be reset, or maybe the light cleared? Or will I have to replace the sensor?