Your 2018 Nissan Sentra is equipped with a tire pressure monitoring system (TPMS) which can be used to help check your tire pressure.
TPMS uses sensors to keep an eye on the air pressure within your tires. When that air pressure drops below or rises above the recommended range, the TPMS will alert you of the problem.
When your TPMS warning light comes on, check your tire pressure as soon as possible. If your vehicle doesn’t display the pressure, keep a separate tire pressure gauge handy to check it yourself.
Then, inflate your tires so that they match the recommended psi and check for leaks in the tires. If these steps are successfully completed, the TPMS light should reset itself.
If it doesn’t, the next step is to press and hold your vehicle’s TPMS reset button until the TPMS light blinks three times.
Alternatively, drive the vehicle at 50 mph for around 10 minutes and the TPMS light should reset itself the next time you turn the vehicle on.
If all this fails, please contact your trusted Nissan service center.