TPMS keeps you safer, saves fuel, and protects tires—but sensors don’t last forever! Today, we break down how TPMS works, signs of failure, types of sensors, and what you need to know before replacing them.
Let’s look at something that quietly works in the background every time you drive—but shows up LOUDLY on your dash when it isn’t happy: your Tire Pressure Monitoring System, or TPMS. TPMS became mandatory on all new passenger vehicles in the U.S. starting in 2007, thanks to the TREAD Act. Why? Under-inflated tires contribute to blowouts, crashes, and poor fuel economy. In fact, properly inflated tires can improve fuel economy by up to 3% and help prevent thousands of accidents every year. That’s a LOT of savings and safety baked right into your wheels!
👉 Types of TPMS Sensors
There are two common types:
Older “banded” TPMS units – These sensors were strapped around the wheel with a metal band. They did the job, but they were bulky, more expensive to service, and—because they weigh more—could slightly affect wheel balance.
Modern valve-stem-mounted sensors – Today’s standard. Compact, lighter (usually 18–40 grams depending on model), and integrated right into the valve stem. Better reliability, easier replacement, and less impact on tire balance. To make it easier to comprehend 18 or 40 grams, three U.S. quarters are about 18 grams, and eight U.S. nickels are about 40 grams.
👉 How They Work TPMS sensors measure the pressure inside each wheel and wirelessly transmit the data to the vehicle’s computer. Many also track temperature. When pressure drops below a preset threshold—typically 25% below the recommended level—your dash light pops on. That’s your vehicle saying: “Hey, time to check those tires!”
👉 When Sensors Need Replacing While the sensor hardware lasts quite a while, the internal batteries don’t. They’re sealed and non-replaceable. Most TPMS sensors last 7–10 years or about 100,000 miles. The signs that yours are on their way out include:
TPMS light stays on Reads pressure incorrectly Won’t reset after tire rotations Intermittent warnings Persistent Dashboard Message such as “Tire Pressure Sensor Fault”
👉 Programming & Relearning When new sensors are installed, your vehicle needs to “meet” them. This may involve: Automatic recognition (common on newer vehicles) Using a TPMS scan tool Key cycle + driving sequences “Relearn” procedures tied to rotation patterns
Good news: Most independent tire shops can handle this quickly and inexpensively. However, the programming is only one part of the equation. If new units are required, they can cost $50 to $200 each, depending on your vehicles make and model, and if you are using factory or OEM parts.
If you believe your sensor batteries are fine and the dashboard tire pressure light won’t go off, it may simply need to be reset. If so, view this episode where we walk you through how to do that: https://youtu.be/-3E8vzlYLqE
👉 Do TPMS Sensors Affect Balance?
Yes—a little. Anything added to the wheel must be balanced out. But since modern sensors are lighter and located close to the centerline of rotation, they only require a few grams of counterweight. Not a big deal when properly installed.
👉 Consumer Opinions Many drivers love TPMS for the safety and convenience. Others see it as one more dashboard light to chase down. But the statistics don’t lie—TPMS reduces under-inflation, saves fuel, reduces wear, and helps avoid roadside tire emergencies.
AI Generated·May contain errors
Hey, Dirt Farmer Jay here from DirtFarmerJay.com.
How do you know when the TPMS, the Tire Pressure Monitoring System, in your vehicle is going
bad?
Well, there's a few signs, and I'm going to tell you what you need to know and how to
get them replaced.
Hey, Dirt Farmer Jay here from DirtFarmerJay.com.
TPMS systems have been in place since 2007 in the United States, and whether you agree
with them or not, you think it might be government overreach or whatever, data shows that we
have had reduced accidents, better mileage, better fuel economy due to less rolling resistance,
and longer tire life because these units have been installed.
And let's be honest, do you check your tire pressure every time you go someplace?
Me neither.
So these are a great backstop.
But how do you know when they are actually coming to the end of their life?
Now, most of these are rated to be approximately five to 10 years in length.
This unit on the box, it shows a five-year warranty on it.
But I got to tell you, the ones that were on our car, which was a 2007, it's now 2025,
they just failed and had to be replaced.
So they served a long life.
Like anything else, technology comes along and improves a product or a way things are
approached.
Earlier TPMS units were usually this kind of band unit.
This went around the wheel, a rim was attached, and then this was affixed inside the rim.
But as you can see, there's a lot to this.
This is pretty heavy compared to what is now used right here.
About three quarters, US quarters, and a penny is about what that weighs right there.
So this is a lot lighter than this and makes it a lot easier to balance in the tire.
So what indicators will you receive to let you know that it's probably time to actually
change these TPMS units?
Well, first of all, you get intermittent messages on your dashboard indicator or a persistent
one that stays on.
The sensors won't reset after a rotation.
Or you get a persistent message, one that shows up that says tire pressure monitoring
fault or sensor fault.
That generally means that the battery is died, that it's no longer capable of generating
the signal that is needed by the car to accurately reflect the pressure condition of the tires.
And so at that point, it's time to make a change.
So when your new sensors are installed, they'll need to be programmed or they'll need to relearn.
So when that's done, that's how your vehicle meets these new sending units.
So this may involve automatic recognition.
So a newer vehicle may automatically sense them and know exactly the condition of the
tires.
Or your technician may be using a TPMS scan tool.
There are also key cycle and driving sequences that many times will activate a handshake,
so to speak, between the dashboard unit and computer and these units.
And then lastly is relearn procedures that are tied to rotation patterns.
So the good news is that most tire shops can handle all of these quickly and inexpensively.
So one of the questions that I hear commonly is, do these units affect tire balance?
Yes, but only a little because they're so light, as we've already pointed out, it doesn't
take much to counterbalance them with light tire weights or even maybe offsetting from
a heavier side of the tire to eliminate any vibration that these may cause.
So is it a concern?
Not really because of the lightness of the modern units.
Operational units will generally send a message to the monitoring system when tire pressure
is 25% or lower than what the recommended amount is.
So it'll set it off, and obviously you don't want to run your tires that low all the time,
but as a safety backstop, so 25% less than let's say 34 pounds PSI, it's going to set
that off and let you know it's time to reinflate, it's time to check those tires.
And this is especially important during weather changes.
When it changes from hot to cold, the tires will tend to lose pressure.
Cold air is denser.
And then the opposite is true during times when the weather's turned very hot or warm.
Hot tires run at higher pressure and therefore tend to be a little bit overinflated during
that time.
So that's something to keep in mind.
However, if you know that you do have operational units or they're fairly new and you're ending
up with error messages up on your dashboard heads-up unit, then check out this video that
we show exactly how to check those out and how to reset them just using some driving
techniques that are programmed into these units.
We know that you'll find that to be helpful to you.
And while you're at it, check out this other video that the man behind the camera, Rob,
has put together this great channel.
If you grew up a child of the 80s or 90s and really enjoyed gaming but you kind of had
to leave it behind but you still love it, how do you fit it in and just live the life
you need to but still enjoy it?
That's what that channel's all about.
Check it out.
I know you'll love what you see.
Hey, until the next time, this is Dirt Farmer Jay from DirtFarmerJay.com, understanding
all about TPMS.
