After the light came on, the tire pressure light came on as well. After I put air in the tires, both lights went off. The other day the hybrid system malfunction light came on again. I needed to replace the front tires, so I thought that if I replaced them, the light might go off. I was right and it did a day later. Is there some sort of connection to the light that comes on and tire pressure, or are they completely unrelated?