I've got a 2010 Nissan Altima and I'm trying to figure out if the TPMS gasket is part of the tire itself or not.
Story: got front tires replaced at Midas. The one that needed replacing was leaking and unrepairable, according to them. Drove away, TPMS sensor was still on. Thought it needed time to reset (I'm a moron). Saw the tire was low, refilled it, few days later was low again. Refilled it, took it back to the shop, they showed me the TPMS gasket was leaking (bubbling soap solution). They replaced the TPMS for free.
If the TPMS is part of the tire, I'm concerned they didn't replace the tire and instead lied to me about the tire being unfixable, got me to pay for new ones, fixed the old one and never put new ones on. The likelihood of a new tire having a bad TPMS gasket is lower than the odds of someone trying to pull a fast one on me.