Errorenous Tire Sensors

2818 Views 5 Replies 3 Participants Last post by 4802, Jul 31, 2017

Pitcher1717

Discussion Starter · Jul 30, 2017

Have been getting alerts, when driving, of one front wheel or the other being under prescribed air pressure on my new '17 718 Boxster. However the TPMS readout diagram is accurate and checks at gas stations prove air pressure is where it should be for each tire. Have experienced this on other cars as well. Somewhat frustrating.
Is there a way around getting these bad readouts that anyone knows about? Thanks in advance

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4802

· #2 · Jul 30, 2017

A) Never rely on gauges at filling stations & buy two really good professional gauges, preferably different brands (even the best aren't exactly expensive). B) Check one gauge against the other regularly to ensure accuracy. C) When you've checked the pressures then reset the reference values. D) Check the tyre pressures often as ambient temperature has a large effect. E) Only check & make alterations when tyres are cold, which is another reason not to check at a filling station. F) Buy a decent tyre inflator to re-inflate tyres at home (because they should never be warm). G) Unfortunately I've not found one TPMS that's 100% accurate but the ones on my 718 are far better than many, including the system on my wife's BMW 2 series & her previous 1 Series.---------------Other than that there isn't much to say other than if you do the above & you keep getting trouble then get the system checked by your Porsche centre.

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GregW

· #3 · Jul 31, 2017

As Chilli says.

I have one tyre that is always about 1 psi down on the others via TPMS reading.
The TPMS is primarily designed for noticing leaks, not for accurate filling.
There is a re-calibration process for new tyres--you might try that. It's in the manual.

Greg

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4802

· #4 · Jul 31, 2017

GregW said:
As Chilli says.

I have one tyre that is always about 1 psi down on the others via TPMS reading.
The TPMS is primarily designed for noticing leaks, not for accurate filling.
There is a re-calibration process for new tyres--you might try that. It's in the manual.

Greg

That's correct, but like I said I find my 718 TPMS is better & a little more accurate than most systems I've encountered. On our BMW's TPMS not one reading on any of the four tyres is actually accurate & nor will it show two tyres with absolutely identical pressures as being the same. So it's not even consistently inaccurate between each of the four corners. It's a little disconcerting that the display shows all four tyres as having a different pressure from each other. However, even though it's hopelessly inaccurate it doesn't really matter because it does still warn you if one of the tyres loses significant pressure from where it was originally calibrated & that's really all that's required of it.

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Pitcher1717

Discussion Starter · #5 · Jul 31, 2017

Thanks much Greg. Will check out re-cal process.

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4802

· #6 · Jul 31, 2017

Pitcher1717 said:
Thanks much Greg. Will check out re-cal process.

Lol : What did I do? I suggested you re-set your reference values before Greg had even commented.

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