While kneeling down beside my car today I heard one of the tire sensor valve stems slowly leaking air, I carefully tightened it and it stopped leaking. My question is, is there a torque value that one uses to tighten them on the wheel, I don't want to break one?

 

Here you go: inch-pounds
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106 in-lbs for 1997 to 2000

61 in-lbs for 2001 and later

I think the "O" ring size is #9 at Home Depot

 

Torques are correct. But the 2001 and later have a rubber "gasket" not an o-ring.

 

My manual says 35 in-lb for 2002. They are a flat rubber seal, I have a set sitting on my bench right now waiting on my new wheels from Fred Beans