Low Tire Pressure Alert

[Larry-O]

i am getting a Low Tire Pressure alert for 2 tires on the dashboard. The drivers front and the passengers rear tires are showing pressure at 32 psi as oppose to 33 psi. I also have nitrogen filled tires.

2 quetions come to mind-

Should I be concerned ? Can I add air using my portable air pump?

Not sure what to do

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[127.0.0.1]

air them up, or reset TPWS to a lower warning pressure

technically
you should keep cold pressures at door sticker pressures if using OEM size tires
so when winter comes that means add more air so it's what, 36psi when cold ?

 

[brumey]

33psi when cold, not 36.

 

[JONNYBOSCO]

mine are all at 31... we'll be traveling north in a few weeks. I'm sure they will DROP below 29 and the Low Pressure light will come on . Think I'll set them all for 34 today.

 

[4RunnerTony]

You said that you have nitrogen air in your tires. I would not use your portable air pump to add air. I have been told that you can not mix nitrogen with normal air. Not sure if true or not.

 

[CO/ZA]

You said that you have nitrogen air in your tires. I would not use your portable air pump to add air. I have been told that you can not mix nitrogen with normal air. Not sure if true or not.

Atmospheric air is 79% nitrogen?

 

[Archer]

You said that you have nitrogen air in your tires. I would not use your portable air pump to add air. I have been told that you can not mix nitrogen with normal air. Not sure if true or not.

Depends on if it's winter air or summer air. Just switched mine yesterday......

 

[Nodak]

Atmospheric air is 79% nitrogen?

yeah i can not for the life of me pay anyone to put nitrogen into my tires when air is 78% nitrogen already and oxygen is another 21%

 

[HVLA]

yeah i can not for the life of me pay anyone to put nitrogen into my tires when air is 78% nitrogen already and oxygen is another 21%

Nitrogen is free at Costco.

 

[Nodak]

Nitrogen is free at Costco.

lol its probably says nitrogen but is probably just plain air, i mean its 78% so technically you could say its nitrogen

/sarcasm

 

[Hacksaw]

Assuming you're being serious, and maybe this is your first car, no, a 1 psi difference is nothing to be concerned about. Forget the nitrogen. Just use regular air and it's fine to blend it with an alleged "pure nitrogen" fill from the dealer. Just make sure you don't air the tire up with Hydrogen

My factory Falkens on my ORP seem to lose about 1-2 PSI a month (or maybe a bit longer than that). I re-inflate them to 33 when any one tire hits 31 psi (but it's not urgent especially if you're not going on a long drive soon). I have the tire PSI display programmed into one of the 3 MID screens so I can see the pressures any time I drive. It adjusts in real time. You never know when you might hit a nail, as I did, and saw PSI of 1 tire dropping in real time.

I have a Milwaukee M18 portable tire inflator (highly recommended if you find it on sale, and especially if you already have M18 batteries). Buy a quick connect extender end for it to make it easier than the screw-on. When one tire hits 31 (and the others have probably dropped a bit too) I just program the Milwaukee to inflate to 33 psi, and re-air all 4 tires. Takes only a few seconds per tire since it's not adding much air.

And as far as a good stand-alone pressure gauge, Project Farm (youtube content creator) lists several accurate ones in his tests. I bought a Jaco ElitePro digital gauge. Nice gauge. But I found the built-in gauge in the Milwaukee inflator to display a PSI that is "close enough" to the more precise measurement with the Jaco that I generally just rely on the Milwaukee's built-in gauge.

Also, be sure to pay attention to the spare. I slightly overinflate it to about 36 just because (on the ORP) I have to get out the tool and lower it to re-air it, so it's more of a pain and when overinflated a bit, I need to do that less often.

 

[Nodak]

the only thing that benefits from nitrogen is airplane tires flying above 25k and racing cars

Nitrogen has a more stable rate of expansion and contraction compared to air, which is a mix of gases and contains moisture. This leads to a much more stable tire pressure, even with drastic temperature changes on the track.

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