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Tyre pressure abnormal?
- Thread starter PaulC82
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- mg zs ev tyre tyre pressure
drmcw
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Yeah should be nearer 2.8 bar!
Alb
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They are all under pressure and although only one triggered the warning, this may be down to a rounding error on the reading.
PaulC82
Established Member
Tyre pressure of course varies with temperature - it was very cold today when this was taken. In double digit temperatures they are indeed 2.8 bar. Plus all we’re talking about ±4 psi here!
The point is it’s claiming only 1 tyre is abnormal, despite them all being the same pressure!
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PaulC82
Established Member
More strange stuff going on. The one with the warning is the one with the highest pressure? Any ideas?
Lovemyev
Distinguished Member
As others have already pointed out, all of the tyres are under inflated.
The system will trigger a yellow tpms warning when ANY one of the tyres
reaches a threshold of about 2.5 Bar.
If the pressures are not corrected, it is very likely that it can ( I have seen this ) trigger a chain reaction around the car that will see all wheels throw up warnings, even though the rest are fine.
After you inflated them to the correct pressures ( 2.7 Bar or about 42 PSI in old money ) then a short drive around the block will recalibrate the TPMs system.
The system will trigger a yellow tpms warning when ANY one of the tyres
reaches a threshold of about 2.5 Bar.If the pressures are not corrected, it is very likely that it can ( I have seen this ) trigger a chain reaction around the car that will see all wheels throw up warnings, even though the rest are fine.
After you inflated them to the correct pressures ( 2.7 Bar or about 42 PSI in old money ) then a short drive around the block will recalibrate the TPMs system.
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hmadsen
Prominent Member
This is normal this time of year, air expands with higher temperatures, so naturally it contracts when it gets colder.
I just had to "top up" my Swasticar tyres as well, they were suddenly down to 2.5 all of them, so i drove where i needed to go (Short trip) and when i got to the pump, they har risen to 2.7, so i pumped them up to the recommended 2.9 and the error went away.
Outside temperature had dropped to 8c, so it was expected they do this, i always try to keep them inflated to whatever they need to be in the summer, if i had inflated them to 2.9 bar in 8c, they would be well over 3 on a hot summer day, driving fast on the motorway.
I just had to "top up" my Swasticar tyres as well, they were suddenly down to 2.5 all of them, so i drove where i needed to go (Short trip) and when i got to the pump, they har risen to 2.7, so i pumped them up to the recommended 2.9 and the error went away.
Outside temperature had dropped to 8c, so it was expected they do this, i always try to keep them inflated to whatever they need to be in the summer, if i had inflated them to 2.9 bar in 8c, they would be well over 3 on a hot summer day, driving fast on the motorway.
PaulC82
Established Member
Great call, guys. Topped them all up to 2.9bar (which it reports as 2.8bar) and it seems to be happy now. Coincidentally, my other vehicle also flagged up a low tyre pressure warning shortly after - so either its temp related or some friendly neighbour is messing with them. Probably the first option is most likely!
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