My TPMS light flashes for a minute and then stays on. I know it has something to do with the sensors in the wheels but how do I diagnose the problem? Or is it something else?

 

So what troubleshooting have you done already? Have you performed the basics like bothering to actually check the pressure of each tire - as the 09's don't have any readouts? You can always take it to a tire shop and they can scan to see which one isn't reading correctly. Of course there's always the dealer...

But first things first, what have you already checked? When did you start experiencing the issue? Anything recently change in your wheel/tire setup?

 

if the tire pressures are ok, get a tire shop to scan your wheels for sensors. they can wake them up if they went to sleep or tell you if 1 or more died.