How Accurate is the TPMS?

X2 Monstah · 10-21-2020, 06:54 PM

How accurate do you think the X2 TPMS is? The car told me my tires were down to 34 PSI. I used two different tire gauges (granted, both of them cheap ones) and got three different readings between the two gauges and the TPMS, by as much as 4 PSI. Should I rely on the TPMS or the gauges? Just curious. Thanks.

//TMT · 10-21-2020, 07:50 PM

Mine reads consistently 2psi low on all four wheels. But I have only compared to one gauge, albeit a calibrated one.

xcelir8bmw · 10-21-2020, 10:04 PM

Within 1 PSI for me across digital as well as analog gauges.

trnguyen · 10-22-2020, 01:27 PM

Mine is within 1 PSI too compared to my digital gauge and the gauge on the Ryobi air pump.

xcelir8bmw · 10-22-2020, 06:35 PM

Quote:

Originally Posted by trnguyen

Mine is within 1 PSI too compared to my digital gauge and the gauge on the Ryobi air pump.

Me too. Ryobiiiiiiiiiiiiiii

trnguyen · 10-23-2020, 10:53 PM

Quote:

Originally Posted by xcelir8bmw

Me too. Ryobiiiiiiiiiiiiiii

I bought the Ryobi torque wrench 1/2 a month ago to do my winter tires/wheels myself this year.

Peter_R · 10-24-2020, 08:20 AM

Quote:

Originally Posted by //TMT

Mine reads consistently 2psi low on all four wheels. But I have only compared to one gauge, albeit a calibrated one.

How often do you recheck the calibrated one?

//TMT · 10-24-2020, 09:39 AM

Quote:

Originally Posted by Peter_R

How often do you recheck the calibrated one?

Not in a while. I don't rely on it much these days, but it's super-handy because it has an air bleed button and a nice gauge face.

CajunBMW · 10-24-2020, 11:44 AM

I can only add that my two BMW's are about 1-2 psi off from a digital and regular gauge. My 340 seems 2 off and my X1 seems 1 off. I would say my gauges are on the better end. Now our van seems spot on.

bimmerdriver2 · 10-25-2020, 11:46 AM

I have a good quality analog gauge. I find that the TPMS reads 1-2 degrees lower than my gauge.

Peter_R · 10-25-2020, 01:27 PM

Quote:

Originally Posted by bimmerdriver2

I have a good quality analog gauge. I find that the TPMS reads 1-2 degrees lower than my gauge.

...and when was it calibrated? You do not know which one is giving the correct reading! It could be either.

trnguyen · 10-27-2020, 12:36 AM

I bought a new TPMS set for my winter wheels. I put them on last weekend and all 4 read 1 psi lower than my gauge.

What I also noticed on 1 wheel is the pressure shown in the tire pressure menu read 35, but it was 36 in the sport display of the car status. They both had the same temperature tho.

10-21-2020, 06:54 PM	#1
X2 Monstah Captain 270 Rep 691 Posts Drives: 2018 X2 XDrive 28i M Sport Join Date: Oct 2013 Location: Fairfax, VA iTrader: (1)	How Accurate is the TPMS? How accurate do you think the X2 TPMS is? The car told me my tires were down to 34 PSI. I used two different tire gauges (granted, both of them cheap ones) and got three different readings between the two gauges and the TPMS, by as much as 4 PSI. Should I rely on the TPMS or the gauges? Just curious. Thanks. __________________ Mine: 2019 Mini Cooper S / Moonwalk Grey / Black Leather Wife's: 2018 X2 XDrive 28i / MSport X / Mediterrean Blue / Mocha Dakota Leather Previous: 2008 E92; 2014 F30; 2016 F30 M Sport; 2011 E82
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10-21-2020, 07:50 PM	#2
//TMT Second Lieutenant 59 Rep 279 Posts Drives: 2020 X2 M35i, 2005 Volvo V50T5 Join Date: Sep 2019 Location: Eastern Massachusetts iTrader: (0)	Mine reads consistently 2psi low on all four wheels. But I have only compared to one gauge, albeit a calibrated one.
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10-21-2020, 10:04 PM	#3
xcelir8bmw Captain 148 Rep 686 Posts Drives: 2019 BMW X2 M35i Join Date: May 2019 Location: Chicagoland iTrader: (0)	Within 1 PSI for me across digital as well as analog gauges. Last edited by xcelir8bmw; 10-22-2020 at 11:09 AM..
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10-22-2020, 01:27 PM	#4
trnguyen Private 33 Rep 98 Posts Drives: BMW X2 Join Date: Aug 2020 Location: Canada iTrader: (0)	Mine is within 1 PSI too compared to my digital gauge and the gauge on the Ryobi air pump.
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10-24-2020, 11:44 AM	#9
CajunBMW Captain 607 Rep 720 Posts Drives: BMW 340i and X1, Chrysler Van Join Date: Mar 2019 Location: Shreveport, LA iTrader: (0)	I can only add that my two BMW's are about 1-2 psi off from a digital and regular gauge. My 340 seems 2 off and my X1 seems 1 off. I would say my gauges are on the better end. Now our van seems spot on.
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10-25-2020, 11:46 AM	#10
bimmerdriver2 First Lieutenant 91 Rep 332 Posts Drives: 2002 BMW M3 6MT Coupe Join Date: Apr 2018 Location: Metro Vancouver iTrader: (0)	I have a good quality analog gauge. I find that the TPMS reads 1-2 degrees lower than my gauge.
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10-27-2020, 12:36 AM	#12
trnguyen Private 33 Rep 98 Posts Drives: BMW X2 Join Date: Aug 2020 Location: Canada iTrader: (0)	I bought a new TPMS set for my winter wheels. I put them on last weekend and all 4 read 1 psi lower than my gauge. What I also noticed on 1 wheel is the pressure shown in the tire pressure menu read 35, but it was 36 in the sport display of the car status. They both had the same temperature tho.
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