Low pressure tyre warning

[Deleted member 14300]

I'm not sure the screen will tell you the bar pressure in real time.

Thankyou for the heads up on that. I'll use the car supplied one. I had a few SEATs with it and you could switch it off.

 

[Anon70]

This webpage has some info about how ambient temperature changes tyre pressures. One issue I had in a previous car that let air escape were slightly buckled wheels so the seal between tyre and wheel rim is compromised.

How Weather Affects Tyre Pressure | VRN UK

Weather can affect tyre pressure in a variety of ways. Discover why it’s essential to check your tyre pressure across all weather conditions.

www.halfords.com

 

[Rolfe]

I had the same thing with my Golf. It only had to see a kerb and it bashed its alloys, and then the seal would be compromised. The MG4 doesn't seem to have the same issue.

 

[Ian Key]

I had a problem with one of my previous cars which kept slowly losing air pressure in one of it's tyres despite it being checked for punctures and a leaking valve.
Turned out I had been over zealous with the pressure washer and had forced water between the tyre beading and the alloy wheel causing corrosion.

 

[Phil]

Aussie here, I found that going for a drive and heating the tyres before setting the pressure to 37psi/256 kpa caused low pressure warnings. Set the same pressures when tyres were cold and no issues since.
Having something to measure/monitor tyre pressure probably is the problem…if we didn’t know about it we wouldn’t worry?

 

[siteguru]

Not sure why you'd warm the tyres and then set the pressures - setting pressures when cold has always been the correct procedure; for every (road) car, ever. ?‍

 

[Rolfe]

I had my tyres changed on Friday. This morning I thought to look and see what the pressures were. Oops. Readings varied from 2.4 to 2.8. After I'd driven to church and back - less than a mile - the one that had been 2.8 was now reading 2.6.

I wonder what dozy apprentice got landed with that job then. Of course, in my previous car I would never have noticed. Looks as if it might be dry enough tomorrow to fix it.

It's possible that the readings before I set off this morning were actually the pressures when I returned from Edinburgh yesterday evening, then it updated to cold pressures once I had driven a short distance. Still not right though.

 

[Ian Key]

I had my tyres changed on Friday. This morning I thought to look and see what the pressures were. Oops. Readings varied from 2.4 to 2.8. After I'd driven to church and back - less than a mile - the one that had been 2.8 was now reading 2.6.

I wonder what dozy apprentice got landed with that job then. Of course, in my previous car I would never have noticed. Looks as if it might be dry enough tomorrow to fix it.

It's possible that the readings before I set off this morning were actually the pressures when I returned from Edinburgh yesterday evening, then it updated to cold pressures once I had driven a short distance. Still not right though.

They might have put the correct pressures in when they inflated the tyres but as they fill the tyres quickly the air heats up and gives a false reading.
When filling BA (breathing apparatus) cylinders we used to put them in a tank of water to keep them cool and fill them up at a moderate speed.

 

[Rolfe]

I've been having my tyres changed at that garage twice a year for about 12 years. I have had no idea what pressures they were at until now!

 

[Mike SOS]

The pressure reading should be on one of the door pillars.

 

[Soaraway]

This is all too much fuss for most people. It's easy:

You WILL get a pressure warning when the weather turns colder. This is expected.

• Go to a garage with an air machine. e.g. Tesco. Set it to 2.5 bar.
• Go round the car taking off all the valve caps.
• Put 50p in the machine
• Stick the wand on the valves one by one, until the machine beeps
• Put the valve caps back on
• Get on with your life for another 3 months or more

Yeah, there's a pump in the boot. But it's fiddly and weak and the gauge isn't very accurate. You might use it to inflate after a run-flat temporary repair, but for routine inflations, pay the 50p, it makes it so easy.

Thanks

Inflated both rear tyres to 2.5 and the alerts stopped.

 

[Rolfe]

My latest (as recounted in another thread) is that the garage managed to swap the wheels on the right hand side. Although the car was telling me that the front one was over-inflated and giving me a low-pressure warning on the rear one, it was actually the other way round. Going back on Friday to be sorted out. Dozy idiots.

 

[fidra]

I had this problem from the first day I got my MG 4. The dealer took it for 2 days and said it was sorted but it started again on the drive home from the garage. A month later the car had a software update and the tire pressure problem went away. About 9 months later I did have one false alarm but otherwise it’s no longer a problem.

 

[STJ73]

I've got a pressure warning but it's not low so can you re set the sensors? Thanks in advance

 

[gazza487]

Pump them all up a little to (2.5bar / 37psi) and go for a 2 minute drive. There is no reset as there are active pressure sensors in each tyre. Correcting the pressure and having the wheels in motion will convince them to transmit their updated readings to the car.

 

[STJ73]

Pump them all up a little (2.5bar / 37psi) and go for a 2 minute drive. There is no reset as there are active pressure sensors in each tyre. Correcting the pressure and having the wheels in motion will convince them to transmit their updated readings to the car.

Does it not have a re set? My VW had one on on the menu that you just press the set button... I'll do it tomorrow before I chuck it on charge

 

[gazza487]

Does it not have a re set? My VW had one on on the menu that you just press the set button... I'll do it tomorrow before I chuck it on charge

The type with a reset are generally the indirect type. I’d lay a few quid that it didn’t have a readout of the pressures in the car.

Indirect measures the rotation of the tyres via the ABS. When a tyre goes down its circumference decreases so rotates a little faster hence it guesses there is an issue. The reset sets the baseline of rotation for the car to learn (to account for wear in tyres, slightly different moulding etc) then it can say yep something is different from the baseline.

Our cars have active tpms with actual pressure sensors in the wheels powered by little batteries. More accurate but you will find when temperatures drop, the pressure goes down and they trigger, completely normal occurrence no reset button.

 

[gazza487]

PS you can clear the warning in the app but it will reappear if pressure is still low

 

[Rolfe]

I've just merged in the most recent thread started about this to try to keep all the information and advice in one place. Read back through the thread, no need to re-post what you already said (unless you want to).

 

[securespark]

...the only way to check the pressures on the fly was to give them a kick.

Something I've been doing for nearly 40 years!