Tire Pressure warning at 35psi?

[Ducati1098]

Probably some way in FDRS but that is a higher bar to clear than Forscan.

Not something FDRS can change. TPMS is federally mandated. Ford allowing technicians to change/modify it would be a big no-no

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[Brian_B]

Not something FDRS can change. TPMS is federally mandated. Ford allowing technicians to change/modify it would be a big no-no

It is federally mandated to have one, but what it gets set to isn't - that's based on your tires, fuel economy, safety, and whatever else goes into whatever that pressure is supposed to be. So if you got a different type of tire, it could require a different pressure.

Like mine - the dealer swapped out my stock Big Bend wheels with new wheels / tires, and as a part of that stuck a new sticker over top the factory one on the door.

Now, the new sticker happened to be the same PSI rating as the old - so maybe they just cheated and it's always that way, I don't know. But I could see if you are doing a totally different tire, like a heavy duty truck stepping up to much higher pressure tire for a 5th wheel or something - you'd want to be able to adjust the TPMS to the new setting.

Not saying you are wrong about FDRS not being able to change it, just kinda surprising. Like techs can't calibrate the speedometer either. Crazy.

 

[Ducati1098]

It is federally mandated to have one, but what it gets set to isn't - that's based on your tires, fuel economy, safety, and whatever else goes into whatever that pressure is supposed to be. So if you got a different type of tire, it could require a different pressure.

Like mine - the dealer swapped out my stock Big Bend wheels with new wheels / tires, and as a part of that stuck a new sticker over top the factory one on the door.

Now, the new sticker happened to be the same PSI rating as the old - so maybe they just cheated and it's always that way, I don't know. But I could see if you are doing a totally different tire, like a heavy duty truck stepping up to much higher pressure tire for a 5th wheel or something - you'd want to be able to adjust the TPMS to the new setting.

Not saying you are wrong about FDRS not being able to change it, just kinda surprising. Like techs can't calibrate the speedometer either. Crazy.

The reason we can’t though is because it affects fuel economy, which I’m guessing is the same reason they also took away our ability to change the speedometer years ago. Ford doesn’t want the liability of their tool or their technicians affecting fuel mileage or anything like that.

 

[DefNotBuddyLee]

Interesting @Brian_B , I've done a lot of wheel/tire changes over the years on various vehicles, and I have never seen a replacement door sticker for adjusted tire pressure. Is that a CA thing? I would think no shop would want to take on liability of putting the wrong tire pressure in print and slapping it on your door jam unless they were regulated to.
I've always just had to chalk test for optimal pressure.

 

[Brian_B]

Interesting @Brian_B , I've done a lot of wheel/tire changes over the years on various vehicles, and I have never seen a replacement door sticker for adjusted tire pressure. Is that a CA thing? I would think no shop would want to take on liability of putting the wrong tire pressure in print and slapping it on your door jam unless they were regulated to.
I've always just had to chalk test for optimal pressure.

Good question - no idea. Here’s a photo. I assumed because it was done by the dealer (they outsourced it but marked it up / sold it as new)

 

[Ducati1098]

Good question - no idea. Here’s a photo. I assumed because it was done by the dealer (they outsourced it but marked it up / sold it as new)

That is interesting, I’ve never seen this either

 

[userdude]

That is interesting, I’ve never seen this either

See, there IS a reason you got out of bed today...

 

[DefNotBuddyLee]

But how many kilopascals?

 

[Brian_B]

But how many kilopascals?

OMG you know I never noticed that - I'm so screwed if I ever go to Canada!

 

[NaMinesClarence]

Do you have sasquatch? Because if so they're supposed to be set at 39, so 34/35 could potentially register a low tire still. I can't remember where the warning is set from the factory.

I consistently set my tires to 35-36psi on my BL Sasquatch after I realized 39 was a ridiculous number. Even Goodyear states 35psi max inflation on the 315/70-17 Territory MT's.

 

[BroncocnorB]

When I installed takeoff SAS tires, I didn’t transfer TPMS. So I just drive with the warning light on. Thankfully the steering wheel rim hides it. But I will air down a bit from 39psi…

 

[Area51BS]

Mine came on today when it hit 29psi.

 

[Brian_B]

I recently traded in my Big Bend for a Black Diamond. I was used to keeping the tire pressure at 35-36 psi. I just noticed on the sticker on the vehicle that the optimal cold tire pressure is 39 psi. I haven't seen the alert even though the tires were down to 34-35 during the colder mornings. Is it safe to keep the tires at 35-36 psi or do I really need to inflate to 39?

Will be fine.

 

[adam1991]

I thought non sasquatch used to be 35, but maybe they changed something.

My OBX non-Sas is indeed 35.

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