Q: There is a Yellow Exclamation point in brackets lit up. What does it mean? 2007 Mazda 3
A: the first person is right. it is your tire pressure light. but first the light turns on when one of your tires drops below 32psi or rises above 35psi. so if you are up a hot tire to 32psi when you park your car and ambient temp drops down below 70 degrees you will lose rough 1 psi for every 10 degrees below 70 the ambient temp drops. i usually air mine up to about 34 on a hot tire.