Consumer Reports has a tire article usually once a year which might address some of your concerns. Here’s a quick summary.
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How old are they?
In my experience, the batteries in those sensors last no more than 7 or 8 years. If yours are really 15 years old, I would be very surprised if they were still working properly.
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No it does not, some vehicle that have a full size spare have a 5 sensor TPMS system, but if you have the small spare then you only have a 4 sensor TPMS system…
So your TPMS light will stay on until you get the new tire and the system resets or has to be reset, the tire shop should reset it if needed as long as all your sensors are good…
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My 09 Vibe/Matrix and sons 09 Cobalt still have all the OEM TPMS sensors and still working (knock on wood lol)… I still think the less the light is on the longer the battery’s last on TPMS sensors, no prof but my experience over the years…
BTW Thanks for making me realize my newer car is now 15 years old… gezzzz 
You might want to contact the folks at the Guinness Book of World Records. 
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It also might help to keep the tires properly inflated, less need for the TPMS sensor to use their battery power to transmit their complaints.
Do they make cars with full size spares?
I keep my tires inflated.
But tires do lose air over time.
Out of 4 tires, one tire loses more pressure that the other three.
I think the tire manufactures do an admirable job in producing quality tires.
There are some, but… not many at this point in time.
Most have donut spares, some have a little tire repair kit and an inflator pump, and some have Run-flat tires.
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That is what I was implying… lol
The less the light is on means the tire pressures are in proper spec…
'08 trailblazer OEM TPMS sensors… 
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I might have missed it . . .
how old are your tires
If they’re several years old, I’d be inclined to replace ALL of them, not just the one that is damaged
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Walmart quality is low on everything.
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That is not true. I buy many things from Walmart.
Andy
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My Toyota dealer had the best prige for the Altimax $130 each plus $40 for balance, install and road hazard.
Just my opinion, on a vehicle more than 10 years old, replace the TPMS at the time of new tire purchase. I did that on my 2013 when I got new tires last year. My thought progress, if the TPMS failed, I would have to pay more for installation than at time of new tire installation. I may be wrong on the labor charge, but also a convenience for me. You can ask the tire dealer.
As far as TPMS age, my GFs Camry TPMS lasted nearly 15 years.
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Res ipsa loquiter.
I’ve never bought ANYTHING at Walmart
They will NEVER get any of my money
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A word of caution on this . . .
Some shops will gladly obtain and install those new TPMS sensors . . . but are unable to program them 
Also on that part, not all aftermarket TPMS sensors will work in your vehicle no matter what the parts store says… so if the shop can not program the sensor(s) then you will have to pay more (all over again) when the new shop that Can program TPMS sensors has to replace your already new sensors with the correct ones…
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