Difference between pressure sensors in wheels and hand tool?

[laardilla]

Hey guys. I just measured the tire pressure in my wheels with two different hand gauges - analog and digital - and it differs from what pressure monitor in car show - for around 10-15kPa (hand gauge 215kPa - in car 230kPa).
Its on all wheels so its not one pressure monitor failure.

Did anyone know why it is?
Are those tire pressure sensors so innacurate?

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[DocWalt]

I see the same sort of error on my car. The car reads consistently higher than all of my gauges, but the difference is always consistent so I know the measurement difference and do the mental math.

It's a bit annoying, but oh well. At least it's consistently wrong

 

[DarkestHour]

TPMS also reads high for me.

 

[laardilla]

Its wierd. Sticker in door says it should be 220. So i just inflated mine to 215-220 with hand gauge and in car I see 225-235.
Strange.
And a bit annoying.

...well, i guess its just Ford

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