Some flashing lights are prettier than others.

I like Halloween lights and Christmas lights. They're usually very pretty. I do not like starting my car and having a bright light start flashing on my dashboard, especially when it's followed up by an informative sign flashing in front of my eyes telling me that the pressure is low in my right front tire. I got out and checked the tire and it looked and felt just like the other one so I made the drive I needed to make to pick up a granddaughter from school and take her ti the orthodontist  Of course the tire pressure symbol kept glowing at me for the entire drive. A few weeks ago the same symbol popped up on my dashboard with a sign that my tire pressure indicator did not seem to be functioning correctly. Which message do I believe?  I'm taking my car to the dealer tomorrow and I'll let a mechanic solve the mystery.