My tire pressure warning light came on mid last week (yellow light with the exclamation point) and I haven't been able to figure out which tire it's referring to so that I can add more air. I called my dealership and they said that I could find out which tire is at fault through my navigation system while driving above 15mph. I still haven't found anything like that in my navigation. Any help would be greatly appreciated!

 

Hmmm.....Did you try a tire pressure gauge, they are like $3 at Pep Boys.

 

Whoever said that at your dealership obviously doesn't know what they are talking about. The TPMS isn't designed to work like that. It's just designed to tell you one or more of your tires is low. Do what TVPostSound said, get a $3 analog gauge and check your tire pressure.

You should be checking your tires manually every so often anyways...don't rely 100% on the TPMS warning.

 

Check pressures. If all good then explore the possibility of a bad sensor.