Tire pressure parameters

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Landryland83

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I recently brought my 2022 expedition into ford for the 40k mile service. When I picked the it up I noticed it was alot more stiff of a ride. They took the liberty to air up all the tires(BFG KO3s) to 45psi. When I got home I let the air out to 34psi which is what I normally run. Now all my sensors are lit on dash saying low tire pressure.

I run 32 psi in my toyos on my f150 and dont get any low pressure indicator.

Is there a way to set this parameter? Or is there a way to reset the low tire pressure indicator on the 2022 expedition so that my service light will go off??

Thanks!
 

Mack444

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I run my KO3s at ~34 with no issues. Maybe driving it awhile will reset it? Strange…
 

DieselMonk

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The TPMS should not light up if a tire is a bit under inflated. I am thinking you let the air too fast out and this triggers the TPMS. So inflate your tires to 38 or 40 PSI and drive around make sure the TPMS is happy. Then air down slowly and drive around again and you should be golden.
 

SyndicateZ

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I recently brought my 2022 expedition into ford for the 40k mile service. When I picked the it up I noticed it was alot more stiff of a ride. They took the liberty to air up all the tires(BFG KO3s) to 45psi. When I got home I let the air out to 34psi which is what I normally run. Now all my sensors are lit on dash saying low tire pressure.

I run 32 psi in my toyos on my f150 and dont get any low pressure indicator.

Is there a way to set this parameter? Or is there a way to reset the low tire pressure indicator on the 2022 expedition so that my service light will go off??

Thanks!
Forscan I believe can set the low range
 

Mr Big

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You should run the air pressure at the specs of the tires. I run my Michelins on my Expedition at 45 to 50psi. I don't have any roughness because the defenders give such a great ride.
 

tominwi

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You should run the air pressure at the specs of the tires. I run my Michelins on my Expedition at 45 to 50psi. I don't have any roughness because the defenders give such a great ride.
Say what? My door sticker says "35 PSI" all the way around for my Goodyear Wrangler 265/70R18 116T. I would normally run them a couple PSI more but... to tire specs?
 

cptbligh

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You should run the air pressure at the specs of the tires. I run my Michelins on my Expedition at 45 to 50psi. I don't have any roughness because the defenders give such a great ride.
The spec on the tire sidewall is the maximum cold pressure they are rated for. It's not what you're supposed to run them at normally. o_O

ETA According to the Toyo chart an LT tire needs around 5 psi more than a stock P metric tire for the same load rating
 
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Eddie Hudson

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I recently brought my 2022 expedition into ford for the 40k mile service. When I picked the it up I noticed it was alot more stiff of a ride. They took the liberty to air up all the tires(BFG KO3s) to 45psi. When I got home I let the air out to 34psi which is what I normally run. Now all my sensors are lit on dash saying low tire pressure.
Check your tire pressures cold, I bet they're lower than 34psi.
 

Fizzy

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You should run the air pressure at the specs of the tires. I run my Michelins on my Expedition at 45 to 50psi. I don't have any roughness because the defenders give such a great ride.

As mentioned already... the max PSI on the tire sidewall is exactly that... the safe MAX PSI, not the recommended... You are absolutely driving around with drastically overinflated tires.
 

tominwi

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It has always been my understanding that the door sticker PSI is what the manufacturer of the vehicle recommends for optimal handling safety and ride quality. I have typically run most of our vehicles a PSI or two above "recommended" because we are not aggressive drivers and I always want the least rolling resistance thus best fuel economy.

I guess I should ask here: Does anyone know for a 4th gen 2024 vehicle as mine, at what lower PSI will the TPMS system activate and warn me a tire is low?
 
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