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I Just Don't Get the TPMS Sensors

 
Old 07-21-2013, 12:26 AM
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jw1977
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Default I Just Don't Get the TPMS Sensors

So a few weeks ago I got new TPMS sensors from my tire shop since the old ones had died. The first problem is they measure 5 pounds less than actual reading(i've tried 3 different gauges). The stock ones measured 3 less than actual. The second problem and this is what I don't get. I believe the system is set up for 33/39 and to give an alarm if the pressures are -4 pounds. THe last few mornings it's been a little colder so my fronts were reading 29 pounds(34 pounds is the actual reading with a gauge) which set off the alarm. Around lunch after its warmed up the reading is back up to 30, so i reset the system but the alarm goes off still. I don't get it?
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Old 07-21-2013, 08:42 AM
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rotesAuto
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I'd return them and put the money towards OEM sensors, good luck
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Old 07-21-2013, 09:38 AM
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Interesting all of mine on multiple cars have been either dead on or +/- 1 pound. I never checked the porsche because they all show I am fine.
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Old 07-21-2013, 11:44 AM
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Mine read about 2 lbs low up front and about 4 lbs low in the rear. As long as the alarm isn't going off its fine. It's just a guide to confirm that all is well and that the tires are up to temp.
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Old 07-21-2013, 12:46 PM
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So why is it going off when when they are reading 30/36?
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Old 07-21-2013, 12:50 PM
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No idea, mine read 30/31 fronts depending on amb temp and 33/34 rear.
My actual pressures are 33/37 cold at 68 degrees.
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Old 07-21-2013, 12:51 PM
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Do you have the load set at full or partial? That will effect it.
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Old 07-22-2013, 03:15 PM
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Its set at partial.
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Old 07-22-2013, 09:13 PM
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How do you know your tire gauge is accurate? How has it been calibrated?
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Old 07-22-2013, 09:26 PM
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I have a digital gauge that I bought, I don't remember where. I've compared it to two different long acre fluid filled gauges and read within half a pound difference.
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Old 07-23-2013, 01:05 AM
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I've tried 3 different gauges and(one is a long acre) and they all are exactly the same.
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