Yep, sounds like your low tire pressure sensor is on. The tires have automatic sensors. When one is low on air, it will turn this light on. You need to attend to this as soon as you can. If you've not discovered it yet, there is no spare tire!

I didn't get my manual for over a week. I took delivery on a Friday and on Monday, I had the red "steering wheel" light come on. I had no idea since I had no manual what that meant. I took it to the dealership. They didn't either. They kept it all day only to discover that all that meant was that the lock for the retractable steering wheel was unsecured.