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      10-21-2020, 06:54 PM   #1
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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.
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      10-21-2020, 07:50 PM   #2
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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
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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
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Mine is within 1 PSI too compared to my digital gauge and the gauge on the Ryobi air pump.
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      10-22-2020, 06:35 PM   #5
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Quote:
Originally Posted by trnguyen View Post
Mine is within 1 PSI too compared to my digital gauge and the gauge on the Ryobi air pump.
Me too. Ryobiiiiiiiiiiiiiii
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      10-23-2020, 10:53 PM   #6
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Quote:
Originally Posted by xcelir8bmw View Post
Me too. Ryobiiiiiiiiiiiiiii


I bought the Ryobi torque wrench 1/2 a month ago to do my winter tires/wheels myself this year.
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      10-24-2020, 08:20 AM   #7
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Quote:
Originally Posted by //TMT View Post
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?
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      10-24-2020, 09:39 AM   #8
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Originally Posted by Peter_R View Post
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.
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      10-24-2020, 11:44 AM   #9
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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
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I have a good quality analog gauge. I find that the TPMS reads 1-2 degrees lower than my gauge.
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      10-25-2020, 01:27 PM   #11
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Quote:
Originally Posted by bimmerdriver2 View Post
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.
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      10-27-2020, 12:36 AM   #12
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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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