TPMS show the same psi as a manual gauge?
Thread Starter
Racer
Joined: Feb 2017
Posts: 1,555
Likes: 345
From: Ontario, Canada
TPMS show the same psi as a manual gauge?
Has anyone checked if the TPMS show the same psi as a manual gauge? I checked mine twice and in both cases the TPMS measure 5psi higher.
Dealer says that TPMS are never wrong and that my manual gauge needs calibrating, but my gauge is not electronic, just one of the old type, yet not a cheap one.
Any comments?
Dealer says that TPMS are never wrong and that my manual gauge needs calibrating, but my gauge is not electronic, just one of the old type, yet not a cheap one.
Any comments?
Driver
Joined: Mar 2002
Posts: 77
Likes: 13
From: IN
My recent comparison of tires pressure shown on the car display (TPMS) and digital gauge showed near identical numbers, so - no problems.
In the OP's case - maybe, try another gauge to check and re-verify the results?
In the OP's case - maybe, try another gauge to check and re-verify the results?
Racer
Joined: Aug 2012
Posts: 1,799
Likes: 228
From: GA
I suggest reading the tire pressure procedure in your owner's manual for initializing the tire pressure warning system. For the 2020 model year It starts on page 390. There are several pages on initializing the system. Not sure it will help.
Driver
Joined: Oct 2020
Posts: 93
Likes: 30
From: OH
if its 5 psi higher across all tires, then its a calibration issue. Just subtract 5 from reading when you read it. Typically, TPMS are more accurate than gauges. You can go to the gas station and check the pressure from the air pump. it should read same numbers from TPMS.
Tires need to be 33PSI cold, but if you have driven for more than 20 minutes, then it has to be set to 36PSI.
Tires need to be 33PSI cold, but if you have driven for more than 20 minutes, then it has to be set to 36PSI.
Lexus Test Driver
Joined: Jul 2017
Posts: 9,626
Likes: 3,422
From: NJ
I just pumped up the tires on my wife's RX yesterday. The TPMS reading matched exactly the pump gauge. Initialization has no impact on the reading as far as I know. It sets the point at which the warning light will trigger.
Advanced
Joined: Jul 2016
Posts: 635
Likes: 227
From: NC
My manual gauges are 2-3psi off the car's dash display, but using my digital display on my portable air compressor matches the car readouts on all 4 tires.
Not surprising that the manual ones my be off a little. I agree with another post on this. If over 5psi I would compare with another gauge measuring cold of course.
Not surprising that the manual ones my be off a little. I agree with another post on this. If over 5psi I would compare with another gauge measuring cold of course.
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Thread Starter
Racer
Joined: Feb 2017
Posts: 1,555
Likes: 345
From: Ontario, Canada
Will try with a different gauge just in case mine is faulty. Thanks all for replying!
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Lead Lap
Joined: Nov 2013
Posts: 4,321
Likes: 1,233
From: IL
Considering all the spinning, banging, bouncing, freezing, splashing, radio frequency interference and centrifugal force
the TPMS sensors put up with it is remarkable they can detect, measure and transmit anywhere near an accurate pressure!
the TPMS sensors put up with it is remarkable they can detect, measure and transmit anywhere near an accurate pressure!
Advanced
Joined: Feb 2020
Posts: 747
Likes: 459
From: WV
TPMS Accutire DeWalt
Driver Front 34 35 34.7
Driver Rear 34 35 34.5
Pass Front 35 35 35
Pass Rear 34 35 34.5
Intermediate
Joined: Apr 2017
Posts: 319
Likes: 84
From: Vancouver, USA
I use a digital gauge, but when I have checked with an air hose gauge I do not get near the accuracy.
Really, I don't know why I use the gauge anymore after 5 years of accurate readings from the TPMS.
Driver
Joined: Jan 2013
Posts: 59
Likes: 0
From: AZ
I Use a longacre analog and an accutire digital gauge and get the same pressure. The TPMS is 1 to 1.5 lbs lower . The variation is probably within the tolerances of the TPMS components. I inflate based on the gauges. I think the best use of the TPMS is to note changes in pressure. Recently with some cooler temperatures in AZ, the TPMS showed lower pressures.Checked with gauges and confirmed the need to inflate.
