My front left tire keeps on losing pressure over time to a severely low level that causes the TPMS warning to come on for that tire. In about a few weeks, it drops from 32 to 25 PSI. The tire has no physical road hazard damage (nails, etc)...so what could it be? Should I take it to the dealer to have them inspect the valve stem and stuff?

 

Definitely have it checked out. Something's wrong with it.

 

Small nails are very hard to see from the outside of the tire. Get it fixed now, since irregular tire pressure will affect your car's handling as well as your gas mileage and tire wear.

 

Set up to see the dealer today...hope it's a warranty claim and not "your total comes to xxxx dollars" :P

 

You probably have a small leak somewhere. It sounds like a slow leak, but you're likely going to end up paying for it because a tire leak caused by anything other than a manufacturer defect is not going to be covered under the warranty.

 

I had the exact same problem in the left front tire - it would lose about 2psi every month. Drove me crazy. I mentioned it to the dealer each time, but it was only on my THIRD oil change that they finally found a nail and patched it.

 

Don't sweat it. Patching tires is inexpensive.