My understanding (i.e., I'm too lazy to look it up right now) is that the law mandates these radio transmitters for tire sensors, and actually prohibits doing it by comparing wheel rotation rates. Of course, using sensors already in place (for ABS &c.) would markedly reduce the attack surface. I've always wondered whether this was done so that all new cars are now trackable remotely for some small-ish value of remote.
Now who would want that?
(/me puts on tinfoil hat back on)
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