If you are talking about the low tire pressure light, you should just be able to fill the tires up with the proper amount of air and the light should eventually turn off.
Short of this, the only thing you could do it disconnect the battery to clear the computer memory. HOwever, this would also clear your radio stations... just to you are aware.
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I would leave the battery disconnected for about 10 minutes. THis should be long enough to reset the light.
If this does not work, chances are you have a bad tire pressure sensor in one of your tires and reseting the light or "code" in the computer will not do the trick... the bad sensor will need to be replaced.
You could sure try to leave the battery disconnected overnight.. but if it does not reset after a few minutes.. then the problem is going to be one of those sensors.
even if you can reset by doing it different ways, and the light still remains on, then again, chances are it is going to be a bad sensor that needs to be replaced.