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      11-08-2019, 08:12 AM   #1
mgattmch
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TPMS Accuracy

The Tire Pressure Monitoring System (TPMS) on my car consistently shows a difference in pressure reading versus a hand held electronic pressure gauge. Generally about 2-3 psi difference. Which is the more accurate, the TPMS or hand held pressure gauge? Does anyone else have a similar experience?
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      11-08-2019, 09:47 AM   #2
Opie55
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There was a thread like this a couple months ago. Assuming you have a quality dial gauge I would trust that. My TPMS reads at least 2 pounds lower than both my gauges, which read the same, so I trust them.
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      11-08-2019, 01:34 PM   #3
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Funny, I was thinking this exact thing a couple weeks ago. I measure my pressures to be exact 0.1 every time and the car is always 1.5 to 2 PSI lower.
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      11-09-2019, 08:57 AM   #4
mgattmch
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I am going to retract my original post. Strangely, the day after I posted my original question the TPMS readings and electronic hand held pressure gauge readings were essentially identical, within +/- 0.2psi. Maybe related to an ongoing calibration function as I drove the car. Bottom line, I trust the TPMS readings.
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      11-09-2019, 10:12 AM   #5
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I still notice a difference between my digital gauge and TPMS. I use my digital gauge number as the max limit and TPMS as the minimum limit. Most importantly though, I make sure both the front and back tires are the same pressures relative to each other.
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      11-10-2019, 07:23 PM   #6
ezmaass
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My indicator came on last night as the temps have been dropping into the 20's and 30's. I filled them up today and did notice that there's a small variance between what my gauge shows and the in-car reading. Not huge but up to maybe 2 PSI, and it did tend to show on the lower side (in car) versus the gauge.

I wonder if it's just calibrated that way for some extra margin of safety? Either way, not a huge deal.
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      12-07-2019, 09:14 PM   #7
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I have calibrated instrumentation that can measure PSIG to .01 and the TPMS on my old F10 was always within 3 tenths of a PSI. I you have air in your tires you will see a significant change in pressure as the tire temp changes, with nitrogen not so much.
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