...which has been on the 2008 truck since it was new. Since the spare tire was so old, I decided to reset the clock with a new tire. I told Costco I had a TPMS light, so check it, replace the batteries or the sensor...whatever it took to make it functional. They said the sensor was good when I picked it up today, but the TPMS light wouldn't reset. Decided to visit the dealer since I could schedule an appointment this afternoon. It was the left front sensor, so I had that replaced. It was a little pricy, so if it isn't required for inspection, I'll just wait until I need new tires before replacing the next failed sensor.