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TPMS question !

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Old Jun 22, 2009 | 03:12 PM
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TPMS question !

do they last a life time or do they have some sort of internal battery?
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Old Jun 22, 2009 | 03:27 PM
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My 8 was built 5/2003 and the TPMS still work. There is a battery, but the power is only on when the car is moving.
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Old Jun 22, 2009 | 03:30 PM
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so basically as long as the car moves it last forever basically?
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Old Jun 22, 2009 | 03:32 PM
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No, when the batteries die......................you will have to get a new TPMS. First you have to figure out which one went bad, then replace it.

Last edited by Mazurfer; Jun 22, 2009 at 03:34 PM.
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Old Jun 22, 2009 | 03:35 PM
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oh ok, a worker from big O tires said most new tpms dont have batteries and last a life time... i bought some used 2005 tpms, how long do these things last for rx8s?
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Old Jun 22, 2009 | 03:39 PM
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???????? I'm still on the original and I have a 2005.

Expo1 says he's had his since 2003.
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Old Jun 22, 2009 | 03:39 PM
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To put it another way, while my TPMS are old, they only have about 70,000 miles on them. Do you know how many miles is on them? If yours are not installed I would put new batteries in them just incase.
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Old Jun 22, 2009 | 03:45 PM
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Expo1.......you sure these aren't emitting a small radio frequency all the time? How else would they do it by a centrifugal switch inside the unit?
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Old Jun 22, 2009 | 03:49 PM
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im looking at my tpms and im pretty sure they're sealed... so idk how i would replace the battery.. is there any way to check? cause i dont wana pay 80$ to get them on my car then find out they're dead..
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Old Jun 22, 2009 | 03:51 PM
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Originally Posted by Mazurfer
Expo1.......you sure these aren't emitting a small radio frequency all the time? How else would they do it by a centrifugal switch inside the unit?
Yes, a centrifugal switch. A member tried placing 4 TPMS in a PVC sealing it and bringing the psi to 32. They didn't turn on and the TPMS light came on. That would indicate the sensors only 'turn on' when moving.

https://www.rx8club.com/series-i-wheels-tires-brakes-suspension-55/attempt-making-tpms-fooler-80447/
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Old Jun 22, 2009 | 08:54 PM
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Originally Posted by expo1
Yes, a centrifugal switch. A member tried placing 4 TPMS in a PVC sealing it and bringing the psi to 32. They didn't turn on and the TPMS light came on. That would indicate the sensors only 'turn on' when moving.

https://www.rx8club.com/showthread.php?t=80447
wow.....MythBusters in action! How did I miss that thread.
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Old Jun 22, 2009 | 08:56 PM
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They last around 10yr 100k. Could last longer and could die sooner.
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Old Jun 22, 2009 | 08:59 PM
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Well that certainly narrows it down! J/K
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Old Jun 22, 2009 | 09:20 PM
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yeah
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Old Jun 23, 2009 | 05:35 PM
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C'mon.......... TPMS = Tire Pressure Monitoring System(don't you have a manual?). If not get one for free after registering at mazdausa.com and read it.

Anyway..............it senses your tire pressure and alerts you when it falls below roughly 26psi. It actually will detect and overfill at about 49-50psi(If I recall correctly).

Last edited by Mazurfer; Jun 23, 2009 at 05:57 PM.
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