Low Tire Pressure Warning but pressure looks okay.

[Shorisha]

Wife is driving to work and 2025 Lucid Air is giving a low tire pressure warning but the psi looks good. The weather right now is very cold. Got down to 13 degrees and is currently 21 degrees. Should we disregard?

 

[Cosmo Cruz]

A 4 psi drop is normal when it's that cold.
It's too low for the 19" A/S tires = should be 49 psi.
You need to add air to all the tires.
Cold tire pressure means: "...not driven for at least 6 hrs. and not in the sun."
Expect it to go back up after driving ~20 min. but I'd still add air and then check it again when the temps. go back up.
Over-inflating a few psi is not so bad. Under-inflated tires are bad.

 

[Shorisha]

According to my owners manual, 45psi is the correct pressure

 

[DeaneG]

According to my owners manual, 45psi is the correct pressure

What does the sticker on your door jamb say? What size wheels do you have?

 

[gavram]

Don't go off of the UI, check the tires manually. Mine show this every year when it gets cold but when I add air it goes away.

 

[skomarla]

Its possible that its actually a little less than 45 psi, but this UI is just rounding up. As the other 3 tires are at 45 psi, but not highlighted, they may just be slightly higher than 45.

for the 19"s i also believe the ideal psi is 49, but you expect variation day to day, temp to temp. i'd try and correct when convenient.

 

[Nephron]

Change units. Also 49 is recommended for AS 19 inch

 

[DeaneG]

It's generally recommended to check your tire pressure monthly and adjust as necessary to keep optimal pressure as the ambient temperature changes.