The tire pressure sensor light has been brightly lit on my dash for some time now. I have repeatedly checked the pressure in all four tires and found them to be properly inflated. Since I had some time of this week, I decided to take the FJ in to the shop to have them check out the warning light. As I pulled into the service bay and started explaining the issue, the service attendant looked at me kinda funny and said, "Did you check the spare?"
I just rolled up the window and left. The apparently 'super-stupid' look on my face was enough. I'm sure they laughed about that all day.
Check the spare...duhh!