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      10-08-2012, 11:53 PM   #23
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Frogman's Avatar

Drives: 2012 F30 328i
Join Date: Mar 2012
Location: SoCal

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Originally Posted by bcl0328 View Post
i actually had all 4 tires show low yesterday. does temperature effect it? it was like 65 in my garage then outside it was 45. drove down the street and it said all 4 were low. i reset it and it was fine though.
Yes, cold temps will reduce the pressure. Remember PV = nRT?

The TPMS on US F30's monitors both pressure and temperature of the tires, so I would have assumed that the car adjusted for the temperature. I guess not!

I coded the car's TMPS display to show each tires temp and pressure. It's one of the coolest coding mods out there. At a press of a button you can see the temp/pressure of your tires and it's pretty accurate.