this post was submitted on 15 Oct 2025
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[–] ChaoticNeutralCzech@feddit.org 65 points 1 month ago (1 children)

Witch's cauldron on top of a rack. How appropriate for Spooktober!

[–] Ephera@lemmy.ml 12 points 1 month ago (2 children)

I was genuinely wondering, if that's the joke, having never seen this light before...

[–] Denjin@feddit.uk 25 points 1 month ago (3 children)

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.

[–] transientpunk@sh.itjust.works 25 points 1 month ago (1 children)

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.

[–] Lucidlethargy@sh.itjust.works 11 points 1 month ago (4 children)

Yeah, this is the actual joke here haha.

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[–] tiramichu@sh.itjust.works 9 points 1 month ago* (last edited 1 month ago)

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.

[–] Fermion@mander.xyz 3 points 1 month ago

Or in my experience, when one of the 4/5 transmitters fails.

[–] Fmstrat@lemmy.world 4 points 1 month ago (3 children)

You must live in warm climate 😀

Cold air in tires makes pressure go down. Low tore warning light.

[–] Ephera@lemmy.ml 6 points 1 month ago

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... 🙂

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[–] fullsquare@awful.systems 39 points 1 month ago (1 children)

fall? yeah, the front will fall off soon

[–] SenatorCollins@aussie.zone 33 points 1 month ago (1 children)

Yeah, that’s not very typical. I’d like to make that point.

[–] janus2@lemmy.zip 17 points 1 month ago

remember to tow your car outside the environment if it needs work

[–] DaddleDew@lemmy.world 26 points 1 month ago (8 children)

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.

[–] JohnnyCanuck@lemmy.ca 25 points 1 month ago

I check mine when my car tells me to

[–] DontTreadOnBigfoot@lemmy.world 13 points 1 month ago (1 children)

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

[–] Threeme2189@lemmy.world 6 points 1 month ago (2 children)

Which biweekly are you referring to?

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[–] KingOfTheCouch@lemmy.ca 7 points 1 month ago

Or they made their seasonal change from their summers to winters, and if, like me, you have separate rims so you can easily do it at home, you now get to drive around with the car whining about no tpms. Because fucking cars can't have this as built in diagnostic functionality in these giant computers on wheels.

When I have time I'll pop over to a shop that can reprogram them to the second set, but it's not exactly priority numero uno.

[–] jonathan@piefed.social 4 points 1 month ago* (last edited 1 month ago) (2 children)

I've just realised I've completely stopped checking mine since switching to an EV. I can go a couple of months without even stopping at a service station, so the old habit is broken.

Edit: For the confused people replying to me, we don't call them gas stations outside of North America. We call them service stations or petrol stations.

I'm sure we do dumb things too, but calling a liquid "gas" is fucking comical btw 😆

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[–] Zink@programming.dev 4 points 1 month ago

I used to be somebody who checked tire pressures much more often. Oil level too.

But even though our current vehicles are 12 and 13 years old, the tire pressure monitoring works right away on a cold day, and its threshold before turning on the light isn't super low. It's high 20s psi I believe.

It's not that I want to ignore the workings of my car. I often enjoy using my phone olconnected to my bluetooth OBDII scanner to provide a bunch of extra gauges. I drive an old Mazda3 and it doesn't even have a temperature gauge, just a light. So it's cool being able to monitor coolant temperature, voltage, actual gallons of fuel in the tank, and various other sensors if I feel like it.

[–] hildegarde@lemmy.blahaj.zone 3 points 1 month ago (4 children)

You don't get it. Snow tires.

You buy a second set of wheels, and its more expensive to add TPMS so you don't and you just get the light 4 months of the year.

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[–] ivanafterall@lemmy.world 22 points 1 month ago (1 children)

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. :(

[–] mic_check_one_two@lemmy.dbzer0.com 15 points 1 month ago (2 children)

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.

[–] HeyThisIsntTheYMCA@lemmy.world 4 points 1 month ago

But it is possible to just push-start it and then keep it alive with the alternator alone.

can confirm. had a buddy in HS whose car had neither a starter nor a working battery. every day after everyone left the parking lot, he would have us push his car over to the street on top of a hill, and then he'd clutch start it on the way down. we only had to push it back up the hill a couple times when he was learning how to do it.

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[–] obinice@lemmy.world 21 points 1 month ago (2 children)

Is that the symbol for a cauldron? I don't get it

[–] ArsonButCute@lemmy.dbzer0.com 7 points 1 month ago

Its a low tire pressure light.

In the fall, lower temperatures cause tire pressure to drop.

[–] zarathustra0@lemmy.world 5 points 1 month ago

I don't own any horse shoes.

Happy tireween to you too.

nice to have a low pressure holiday.

[–] LemmyKnowsBest@lemmy.world 18 points 1 month ago (11 children)

Is it normal for tire emergency lights to come on in autumn?

[–] JohnnyCanuck@lemmy.ca 46 points 1 month ago (1 children)

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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[–] Barking@lemmy.world 29 points 1 month ago

We usually get a big enough quick drop in temperatures that I get this each autumn. Even with new tires

[–] snooggums@piefed.world 17 points 1 month ago

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.

[–] ThisIsAManWhoKnowsHowToGling@lemmy.dbzer0.com 14 points 1 month ago* (last edited 1 month ago) (1 children)

Heat up gas => pressure go up

Cool down gas => pressure go down

pV=nRT

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[–] DarkSirrush@piefed.ca 4 points 1 month ago (1 children)

My winter rims don't have sensors because those cost money.

I live somewhere that I can't get away with all season tires from late October until late April.

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[–] echodot@feddit.uk 14 points 1 month ago (8 children)

Isn't it great how cars just have like random lights that come on whose design is so ambiguous that there's no possible chance you could work out what they're trying to indicate.

My car occasionally displays a blue tick, what the hell is that supposed to mean? It only comes up maybe once every 4 or 5 months so it's really hard to work out a pattern.

[–] rustydrd@sh.itjust.works 33 points 1 month ago (1 children)

My car occasionally displays a blue tick, what the hell is that supposed to mean? It only comes up maybe once every 4 or 5 months so it's really hard to work out a pattern.

I got the same issue with my BMW, except it's a green arrow pointing either left or right that flashes and makes a ticking sound. Only lasts for a few seconds though.

[–] echodot@feddit.uk 10 points 1 month ago

Oh that sounds like the swerve suddenly into another lane without looking light.

[–] kSPvhmTOlwvMd7Y7E@lemmy.world 11 points 1 month ago (14 children)

Dont you have the manual? I did buy a used car and it had manual

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[–] sexybenfranklin@ttrpg.network 10 points 1 month ago (3 children)

You should read your car's manual.

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[–] FiskFisk33@startrek.website 9 points 1 month ago* (last edited 1 month ago) (2 children)

4-5 month is an awfully long time to be too lazy to rtfm

I mean, I agree it's silly design, but come on

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[–] SwingingTheLamp@midwest.social 6 points 1 month ago

I used to drive a Sprinter, and on the dashboard was a light with iconography of waves, wind, and raindrops. I concluded that it was warning me of a storm at sea.

[–] BanMe@lemmy.world 6 points 1 month ago

I just got a used Cadillac and it has this little blue icon quite frequently. Had to get out the manual. It means I'm driving over the speed limit. Fuck's sake what a useless light.

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[–] uberdroog@lemmy.world 11 points 1 month ago (3 children)

35 to 27...buy a small compressor, its handy

[–] lightnsfw@reddthat.com 3 points 1 month ago

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.

[–] boonhet@sopuli.xyz 3 points 1 month ago

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.

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[–] Bamboodpanda@lemmy.world 8 points 4 weeks ago (3 children)

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.

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[–] Pulptastic@midwest.social 5 points 1 month ago

I just checked my tires, somehow only lost 0-1 psi per tire since April. I did check them on a hot day so that probably helped.

[–] HeyThisIsntTheYMCA@lemmy.world 5 points 1 month ago

we top ours up at tireween and tirester every year

[–] 13igTyme@piefed.social 4 points 1 month ago

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.

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