If you have a tire pressure monitoring system on your tires, i am guessing that it means one or more of your tire pressures is low.
That one or more of your tires has low pressure.
low power light, may be a vac leak
If the exclamation point is inside a yellow horseshoe, the tire pressure is low
You have a tire low on air.
upside horseshoe on the car
Tire Pressure warning.
Tire pressure is low
Uncorrect tire pressure
I can not find where is located the position of sensor crank of 1999 nissan sentra 2.0 ( in what point is located in the motor)
Low brake fluid or problem with the braking system.
That tires are very low.
I think it is the amount of air in your tires