can I reset my dashboard tire pressure warning light?

Chances are one of the sensors has failed due to weak or dead battery in the offending sensor.

 

If you have indeed performed the reset procedure correctly, than, as previous poster said, you have an issue with the actual sensors...
Did you:

1. Set the tire pressure of all wheels to the proper pressure.

2. Turn the ignition switch to the ON position.

3. Press and hold the tire pressure warning reset switch until the tire pressure warning light blinks three times at one-second intervals.

Some things that apparently can interfere with reset...
Due to the air valve angle of the tire pressure warning valve and transmitter, they may not be used on wheels other than those originally installed on the vehicle.

Under the following conditions, the system may not function properly:

• areas, facilities or devices that use similar radio wave frequencies to those of the sensors are located in the vicinity of the vehicle;

• a radio device of similar frequency is used near the vehicle;

• a lot of snow or ice is stuck to the vehicle, especially around the wheels or wheel housings;

• tires and wheels are installed that are not equipped with a tire pressure sensor;

• snow tires or tire chains are used;

• the battery of the sensor has been depleted;

• wheels other than manufacturer factory wheels are used (if any other wheels than the specified ones are used, the system may not function properly because the radio waves are differently transmitted from the tire pressure sensor);

 

Sensors and batteries are in the wheel, a small piece of electrical tape placed properly will block the offending light.

 

The electric tape would be my vote. To get to the sensor, you have to dismount the tire from the wheel. Something the average person is not able to do.

Even if you did that, I believe that most sensors are made so as the battery cannot easily be replaced -- not to say it could not be done, but not something the average person would attempt.

Finally, you don't really know what is wrong. Probably the battery, but maybe not.

Your option is to take it into a garage/tire shop and ask for a diagnosis/estimate (you could call around first and ask what they would charge to replace a sensor. Odds are if one has failed, the others COULD be getting close also.

Or, ignore the light. Eventually, when you need new tires, you could deal with the sensor issue at that time. Either replace or not.

As I understand the law -- and do not rely on my thoughts -- a motor vehicle repair business would not be violating 49 USC 30122(b) by removing an inoperative or damaged TPMS sensor and replacing it with a standard snap-in rubber valve stem.