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It's that time of year again.
(lemmy.world)
fall? yeah, the front will fall off soon
Yeah, that’s not very typical. I’d like to make that point.
remember to tow your car outside the environment if it needs work
Witch's cauldron on top of a rack. How appropriate for Spooktober!
I was genuinely wondering, if that's the joke, having never seen this light before...
This is the warning for low tyre pressure. Often shows up after you've had a tyre change, such as when you go to winter tyres around this time of year.
Colder air also takes up less volume relative to warmer air, therefore exerting less outward pressure. So, if you haven't aired up since July, it's entirely possible that the lower temperatures alone can cause this light to come on.
Interesting fact, the tyre pressure warning isn't always measuring your tyre pressure! At least, not directly.
Some cars have actual pressure sensors inside the wheels which do measure it, while others (like mine) use the ABS sensor - which measures wheel rotations - to determine pressure as a byproduct.
The theory goes that an under-inflated tyre is smaller in diameter than properly inflated one, and so will have to make more revolutions than a properly inflated one to cover a given distance. By comparing the current status against a programmed normal, a mismatch that indicates possible low pressure can be detected.
Because what is 'normal' can change after you inflate your tyres or change them, cars with this type of indirect sensor will also have a button somewhere to reset it (mine is inside the glove box) so you can redefine what 'normal' is and cancel any spurious warning.
You must live in warm climate 😀
Cold air in tires makes pressure go down. Low tore warning light.
Nah, I haven't had a car for a few years and my car before that didn't have this feature, because it was an old car... 🙂
The part I find funny is I've never had seasonal low tire pressure except when the polar vortex rips through and drops temps down to -40ish (which fun fact is the same in both Fahrenheit and Celsius) maybe this is a thing for folks with heated garages?
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Is it normal for tire emergency lights to come on in autumn?
We usually get a big enough quick drop in temperatures that I get this each autumn. Even with new tires
Just the low tire pressure warning.
Cold temperatures reduce the pressure, and since air leaks out of tires naturally over time, it is quite common for the change in temperature to suddenly put your tires below the threshold for normal tire pressure.
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Yes, if the tires were close to the cut off before the temp dropped. The sensor in my vehicle readstire pressure about 10% low in colder weather, which can be enough to trigger the warning on chilly mornings if I haven't topped it off during the summer.
Heat up gas => pressure go up
Cool down gas => pressure go down
pV=nRT
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It's only normal if you've been neglecting to check your tire pressure on a regular basis. Unless you live in a place with a massive yearly temperature differential, properly inflated tires won't lose enough pressure to trigger the TPMS light once temps drop in the autumn.
Prevent a blowout: please stay on top of your tire pressure, people. Check it at least once a month.
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It never really occurred to me that most people don't check their tire pressure once or twice a month and let it get that bad.
In the last month, the high temps where I live have dropped approximately 40 degrees.
That enough to drop tires pressure to the point of the light coming on if you're not checking it at least biweekly
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I check mine when my car tells me to
Mine got down to 18 psi
"That bad" is dropping from 32psi to 28 on the first cold day of the year. Doesn't matter, I fill up once I'm back home.
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When living in Florida I used to air up my tires constantly because of the temperature overnight. Now in Oregon it's been 2 years and it's only been filled once during an oil change.
Do you mean the time of year where a battery cell goes bad, ruining both the battery and the alternator while you have an Uber passenger in the car an hour from home and every system in your car is cartoonishly shutting off one by one?
Because YEP I GUESS IT'S ABOUT THAT TIME. :(
Chances are that the alternator was already bad, but symptoms didn’t manifest until the battery started to die. A running car should be able to stay alive purely from the alternator. It’s not a great long term solution, since it causes extra wear on the alternator. But it is possible to just push-start it and then keep it alive with the alternator alone.
Happy tireween to you too.
nice to have a low pressure holiday.
we top ours up at tireween and tirester every year
I live in Taiwan and it's been 90-95 since February.
Get an air pump that runs off your car battery. Don't get a jump/pump as those are more expensive and they break. Get one with a flashlight.
It's one of those cheap purchases that makes a world of difference.
35 to 27...buy a small compressor, its handy
I got a Ryobi battery powered air pump. It's so nice to not have to drag out the whole compressor just to add a couple lbs my tires when the temperature drops.
Yeah I've got a small battery powered compressor that will top off tires up to about 37ish PSI but struggles to put more than that in. It's nice for a quick top off, but my bike wants 60PSI so I had to buy a real compressor to keep my bike tires happy
Get a first gen Porsche Cayenne for a couple thousand and you get a hose from passenger footwell. Uses air from the air suspension lol
Fuel economy is as abysmal and it MAY eventually need an engine rebuild. Still best car I've ever owned.
Is that the symbol for a cauldron? I don't get it
I don't own any horse shoes.
Its a low tire pressure light.
In the fall, lower temperatures cause tire pressure to drop.
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this post was submitted on 15 Oct 2025
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