My tire pressure warning light is on saying underinflated pressure although I checked the tiresand the pressure and they were OK. The warning light remains on. How do I fix this?

Although the battery life of the Tire Pressure Monitor Sensor (TPMS) is about 7 years they don't always make it that long and replacing it is the most likely solution. The battery can't be changed as its embedded in the sensor, which by the way is inside the tire on the other side of the valve. They are cheap though and any tire shop should have them in stock.

If you have access to a VAG-com cable you can probably find out more specific info.

Could you possibly take a picture of it and upload it? Also, have you read the manual? Go through to the instrument cluster section and look for the symbol. Could be some like this...



This icon is a Low Tire Pressure Warning light. This light comes on if your vehicle's tire pressure monitoring system (TPMS) detects a tire that is more than 25 percent underinflated. Driving on a low tire can be dangerous because it increases the risk of a tire blowout. A low tire can also cause your vehicle to brake unevenly, pull to one side, handle poorly and get reduced fuel mileage. If the TPMS Low Tire Warning light is on, check the air pressure in your tires as soon as possible, and inflate them to the recommended pressure.

The other choice sound as Traction Control light. It normally lights if the car detects slippage and engages the ESP. It will stay lit if you press the ESP button on the center stack of the dash. If it stay lit all the time regardless then it means something in the ESP system is broken, but I don't have the expertise to know what...maybe ABS sensor(s), but I honestly don't know.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

This (!) symbol is your TIRE PRESSURE MONITORING SYSTEM (TPMS) warning light.
The manual has this to say about it:
This system monitors tire pressure. if the low tire pressure warning light illuminates, check the tire pressure in all four tires. Adjust the low tire pressure to the recommended cold tire pressure shown on the Tire and Loading information label located in the driver's door opening. After tire pressures are adjusted, the vehicle will need to be driven at speeds above 16 MPH (25 km/h) to activate the TPMS and turn off the low tire pressure warning light.

turn the key to the on position (not running)
let at least 6 lbs of air out of each tire
put at least 32 lbs of air back in each tire
turn ignition to off
start vehicle and the light and sensors should be reset

"TPMS" light when ON indicates that the tyre pressure monetering system is malfunctioning. One or more of the TPMS components may experience failure. Vehicle should be driven to the authorized dealer for service. This warning is different from "underinflation" warning, also found on the dashboard in shape of deflated tire with "!" in the middle. hope this helps

With and without "Mesage Center" respectively (pretty sure)

With the engine on...

Push "Setup" button, until your driver display says something like "Press Reset for system check".

Then push Reset. The system check will start, rotating through a series of checks.

About the fifth or sixth check will be the tire pressure. The system will sound the tone (same one that starts w/the light) and It'll say something like "Check Tires Pressure" on that moment press and hold for 3 or 4 seconds Reset. When you release the Reset button It'll show "Hold Reset if tires are OK". While that's up, hold the Reset button. After 3 or 4 seconds, the tire warning light will blink 2 or 3 times and then will stop .You need to be ready for it, because you don't get very long to release.

How to reset the low tire pressure warning if the vehicle does not have the "Message Center"

Turn the ignition to the ON position,
depress and Trip/odometer button (located in the instrument cluster) until "TIRE RESET" or "CHECK TIRE AND RESET" is displayed in the odometer display window.
Once "TIRE RESET" or "CHECK TIRE AND RESET" is displayed, press and hold the button for three seconds.
The low tire warning indicator light will flash three times as the low tire warning system begins to initialize.

This information is in the Owners Manual

Hope it helps

Tire pressure should be set at 32 PSI on all the tires. There is also a reset button to reset the TPMS,
To reset this system, you press a button to zero the system on the dash or through the on-board computer. If one of your tires is underinflated while trying to zero it, then you will not have a correct reading. Before you try to recalibrate the system, make sure your tires are set to the correct pressure spec.
It's under the dash, to the right side of the steering column. Slide your hand around under there & you'll find it.
Thank you for using Fixya, and good luck

Check the tire pressure at the valve mounted to the wheel. There is a warning light on the instrument cluster to warn of low tire pressure. On a 2009 Maxima, if your warning light comes on check and adjust, if needed, the tire pressures at all 4 wheels. If the pressures were low the light will go out after a short distance. If the light fails to go out take the Maxima to your local Nissan dealer.

Check that all your tires are inflated to the specification recommended by the vehicle manufacturer or higher. There is no TPMS warning for "overinflated" tires, because there is far less danger per NHTSA studies than "underinflated" tires.

You can safely inflate your tires to the max pressure rating on the sidewall. The pressure listed by your vehicle manufacturer is a compromise between noise, tire life, and ride comfort.

Try installing more air, up to 35 PSI, and see if the light goes out. If it does not, you may have a faulty TPMS sensor, which is inside the tire, attached to the tire valve. This will require a qualified service technician to further diagnose and repair.

That light is the Low Tire Pressure Warning light. It comes on to indicate to you that one of your tires may be underinflated.