Replace TPMS when replacing tires?
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Thread: Replace TPMS when replacing tires?

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    Replace TPMS when replacing tires?

    I'm about to get my tires replaced and was wondering if I should have TPMS replaced. One the one hand it cost a lot less to have TPMS changed when the tires are replaced, but on the other hand TPMS may last many more years after the tires are replaced. So wait until they fail or replace them when tires are replaced?

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    Re: Replace TPMS when replacing tires?

    My decision in this same circumstance was to leave the old TPMS sensors in place. I didn't know how old they were as I had bought the car used, but the shop said the sensors were emitting a strong enough signal. I took a photo of one of them so I know what ones to order when the time comes. That will allow sensors of the exact same weight to be installed without a need for rebalancing, which will cut the installation costs if they fail before the next tire change.
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    Re: Replace TPMS when replacing tires?

    Two factors come into play: age & usage. Generally, TPMS batteries will last around 6 to sometimes 8 yrs. However, that's continuous usage so if you swap tires or store the car for a length of time the batteries go into sleep mode and will last longer. I have a set of snows with TPMS batteries that are 11 yrs old, but I only use those tires 4 mo a yr.

    It's supposedly possible to replace the monitor without removing the tire. The tire guy breaks the bead and then reaches in to replace the monitor. So it's not a disaster to wait until they die to replace them. But if 1 dies, replace them all because the other 3 aren't probably far behind.

    If they're significantly old, best to change them with the tires as waiting will cost you additional $$$ to have them inserted.
    Last edited by husker boxster; 03-20-2019 at 08:01 AM.

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by husker boxster View Post
    Two factors come into play: age & usage. Generally, TPMS batteries will last around 6 to sometimes 8 yrs. However, that's continuous usage so if you swap tires or store the car for a length of time the batteries go into sleep mode and will last longer. I have a set of snows with TPMS batteries that are 11 yrs old, but I only use those tires 4 mo a yr.
    Do you know how that works? Do the batteries drain when just sitting there and not transmitting. I had heard 5 years but maybe thats based upon the normal 12 - 15K miles per year and not time? I ask because I asked a dealer about this and they said "time", but when they checked mine they said it was near 100% capacity (I don't know how they do that). Granted I don't drive the 911 in the winter, about 3 - 4 months of the year.

    Any ideas how they really work, when they "go to sleep?"

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by chows4us View Post
    Do you know how that works? Do the batteries drain when just sitting there and not transmitting. I had heard 5 years but maybe thats based upon the normal 12 - 15K miles per year and not time? I ask because I asked a dealer about this and they said "time", but when they checked mine they said it was near 100% capacity (I don't know how they do that). Granted I don't drive the 911 in the winter, about 3 - 4 months of the year.

    Any ideas how they really work, when they "go to sleep?"
    I remember this from a tech session several yrs ago at our Porsche dealership. They also were the ones who said you could insert monitors w/o removing the tires from the wheels.

    It appears motion or lack thereof sets the monitors into sleep or active mode.
    MAP Auto Shops use Auto Tire Pressure Systems | Motorist

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by husker boxster View Post
    I remember this from a tech session several yrs ago at our Porsche dealership. They also were the ones who said you could insert monitors w/o removing the tires from the wheels.

    It appears motion or lack thereof sets the monitors into sleep or active mode.
    MAP Auto Shops use Auto Tire Pressure Systems | Motorist
    That's exactly what I heard from a Porsche tech. Another thing I discovered is that Porsche charges $200 per sensor, whereas a local tire shop charges $86 per sensor for a Porsche sensor. But I guess that shouldn't be surprising. Actually my patience with Porsche pricing is wearing very thin. Can I afford the Porsche surcharge? Of course I can, it's just the principle of constantly getting ripped off.

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by Caymancouver View Post
    My decision in this same circumstance was to leave the old TPMS sensors in place. I didn't know how old they were as I had bought the car used, but the shop said the sensors were emitting a strong enough signal. I took a photo of one of them so I know what ones to order when the time comes. That will allow sensors of the exact same weight to be installed without a need for rebalancing, which will cut the installation costs if they fail before the next tire change.
    I like your approach.

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by husker boxster View Post
    I remember this from a tech session several yrs ago at our Porsche dealership. They also were the ones who said you could insert monitors w/o removing the tires from the wheels.

    It appears motion or lack thereof sets the monitors into sleep or active mode.
    MAP Auto Shops use Auto Tire Pressure Systems | Motorist
    Thanks. Make sense to me. And the opposite of what a dealer told me. LOL It also explains a lot. Even alkaline batteries are good for 10 years now never mind lithium

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    Re: Replace TPMS when replacing tires?

    Never understood the temperature compensation feature. Of course, pressure goes down as the temp drops. Isn't that exactly what you want to know? Actual pressure at the actual temp?

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by AJK View Post
    Never understood the temperature compensation feature. Of course, pressure goes down as the temp drops. Isn't that exactly what you want to know? Actual pressure at the actual temp?
    This always confused me too, even after reading that section of the owners manual 6 times.

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    Re: Replace TPMS when replacing tires?

    Strange....wonder why they wouldn’t use a mechanism like a self winding watch and use motion to get a charge.

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    Re: Replace TPMS when replacing tires?

    Quote Originally Posted by husker boxster View Post
    I remember this from a tech session several yrs ago at our Porsche dealership. They also were the ones who said you could insert monitors w/o removing the tires from the wheels.

    It appears motion or lack thereof sets the monitors into sleep or active mode.
    MAP Auto Shops use Auto Tire Pressure Systems | Motorist
    My sensors were replace without removing the tire. They just broke the seal near the valve and saved me time and money. There have been 0 problems.

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