I have a 2010 PT Cruiser, My tire sensor light is on, but the tires are not low on air, is there a way to determine which sensor is out ? the onboard dash display doesn't seem to give you each tire psi, or any tire psi.

 

Quite likely the battery in one of the tpms sensor has died or is dying as the expected battery life is 10 years. I would expect all of the tpms sensors to fail in the coming months and unfortunately all will need replacement.