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TPMS issue

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Last night I was at a hotel and my car was parked outdoors. It got down to 4 degrees Celsius. When I got in the car in the morning I had a notification that my left front tire was low (driver side). So I changed from km to miles so I could see the PSI of the tires.

Left front 41

Right front 41

Left rear 41

Right rear 39

So, I thought it was strange since it was telling me left front was the problem. I decided to go to the gas station and check al and add some air if needed. All 4 were at or slightly above 40. I topped them up a bit to 42. Still left front saying low.

Drove a while longer, temperature warmed up and warning went away.

I thought 42 psi was the right number and honestly I didn’t even check the door. Am I wrong.
 
That is precisely why the door states “cold fire temperature”. When it warms up air molecules expand and psi may increase temporarily causing alret to go away only to return when tires cool. One work around is filling your tires with nitrogen.