If you have a car with the 60psi doughnut spare under the car (like most minivans) almost no one, including the dealers, will check the pressure in them. It is a little time-consuming for places to drag the tire out, check & air it up, then get it back under the car and snugged up. So most oil change places and even the dealers don't check it. Not sure if those have the pressure sensor but if it does, that is quite likely why the pressure lite stays on. If it doesn't have a pressure sensor, I suggest you have the pressure of the spare checked any way - after a couple of years it may well be down below 30psi and will be dangerously close to failure just when you need it.
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