An alarm sounded and an image of a vehicle with a dot on one of the tires was on my dashboard.
It claimed that I had 32 pounds of pressure in three of my tires, but the fourth tire said 24. So, at some point I lost air pressure. We like to keep them 32 to 35 p.s.i. (pounds square inch)
I used a tire pressure gage and it was low. Plus the tire was making a strange noise. A squeeking, whirring noise. Maybe a puncture, but once I put air in it, I couldn't hear it anymore.
Then, I checked all the tires.