Tyre Pressure Monitor Accuracy??

[Pacemaker]

Mine seems out by about 2 psi on all sensors equally
How accurate is it supposed to be? Or is it just an indicator ?

[putt4par]

The readings on my car are the same as on my tyre pump, so roughly the same, on other makes the sensors just register a drop in pressure alone, I believe ours transmit a signal which indicates actual pressure,

Hope this helps.

[Bigboyrolo]

I believe ours transmit a signal which indicates actual pressure, Hope this helps.

They do indeed, as I discovered in Central France a while ago. I watched the pressure fall as I came to a stop.

[Paul]

??
You had a vacuum in the o/s/f? (or is that the fill delta....?)

[Nuclear Nick]

Mine seems out by about 2 psi on all sensors equally
How accurate is it supposed to be? Or is it just an indicator ?

The continuous pressure readout is only a guide. When the car is stationary, when viewing the same screen press the select button on the steering wheel. You should now see 'fill info'. This is an accurate, temperature corrected readout of the difference, if any, from design pressure in each wheel. Use only this information to add or subtract the stated difference to achieve the correct pressure.

This explains why your pressure gauge, which isn't 100% accurate anyway, differs from the car's readout. Note that the manufacturer's recommended pressures only apply at 20C.

[Pacemaker]

Cheers Nick
Have ordered a calibrated gauge so will compare like for like and report back

[Paul]

^^
I know it’s all a bit OTT, but part of dealership standards will be a six monthly full calibration of tyre gauges....(and all other equipment)

[Pacemaker]

Turns out the monitors are all spot on!
Recommend getting good quality gauge that’s calibrated

[bennachie]

My experience is that monitors are exact

[Nuclear Nick]

Turns out the monitors are all spot on!
Recommend getting good quality gauge that’s calibrated

What gauge did you get, and what is the stated accuracy?