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Old 11-07-2012, 05:56 AM
Ralph1201's Avatar
Ralph1201 Ralph1201 is offline
Officially Welcomed to the 'Fest
Location: Cleveland
Join Date: Mar 2012
Posts: 382
Mein Auto: 2013 BMW 528i
Tire Pressure acts strange FIXED

2 weeks back, when i started my car after shopping, it showed Front Left tire yellow "pressure low, drive and brake safely". i drove home, waited the tires to cool down and checked with gauge - all showed around 38 psi. so i started the car and resetted TPMS. Guess what, warning went away.

i read in another thread that there is a threshold for the TPMS indicator to turn yellow, and it is 25 psi. i would imagine that the tire pressure go down below that once the tires cooled down. Normally, warnings show up during startup, but goes away once the tires warm up. in my case just the opposite has happened.

same thing happened the next time i took my car. after driving 10-15 mins (i.e tires warm up), warning in front left. once back at home and tire cool down and TPMS reset, it goes away. anyways, i went ahead and filled more air into the problem tire and ever since no warning occurred even after driving quite a lot.

last week i coded for TPMS pressure display. it shows the same thing! the problem tire shows 27 at cold start, goes up to 28.3 and then after 15 mins driving, even though tire temperature keeps going up, pressure goes down to 25.5.
no warnings yet, confirming the 25 psi threshold for yellow. all other tires behave normally. ie. 37 psi at start increases to 40 along with the temperature rise.

is the tire flat??
2013 BMW 528i. My first Car.

Last edited by Ralph1201; 11-14-2012 at 04:54 AM.
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