Same with my 2011 Sonata. I found out the hard way...... my RR TPMS valve stem broke off while checking tire pressure b/4 a trip to Walla Walla. My "tire inflator/leak sealer" did me absolutely no good. Fortunately I was in my driveway, not on the road somewhere, and the dealer had one in stock (not a normal stocked part per the service department). But had to go back 2 days later to have the computer reset for the stem change. All in all, not a fun thing to find out the hard way.
The service manager told me the practice started around 20 years ago by Mercedes, and was followed by Ford a few years later, and now most manufacturers are on the same bandwagon. The "claimed" reason is for fuel economy by weight savings. Ha Ha Ha.
Guess I'd better quit hijacking this thread.
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