Ya, I asked the tire guys to test the sensors before they installed them. We can see how well that worked. I'm so glad I brought them coffee and tipped them $20 that I won't be returning for new summer tires on my wife's Acura.

Thanks for your help. I'll update the thread when I decide what to do.

 

Multiple posts re Ford's parts lookup by VIN provides wrong mhz. Existing sensors can be scanned to verify frequenc before buying new ones.

https://www.f150forum.com/f118/2017-...quency-403000/

https://www.f150forum.com/f31/how-te...i-have-490800/

https://www.f150forum.com/f118/ford-...n-tpms-456525/

https://www.f150forum.com/f118/corre...8-f150-441991/

 

I recently went through a similar experience with TPMS on my 2020, I ordered a set from Amazon and could not get the truck to read them. I went up to my local Discount Tire to see if they could program them and the guy asked what I paid for them and said he would match it for a set of theirs, with a warranty and all. I was having a set of Ridge Grapplers put on so I was gonna pay the $21 a tire to mount/balance anyway. Needless to say, I was pleasantly surprised and promptly setup the return through Amazon to get my money back. I got a killer deal on the tires too, $550 for a set with 500 miles on them, so I was all-in for less than $700. It looks yall have Discount Tires up in Oregon, so they might be worth checking out if so.

 

Son of a B!

Thanks for all that work searching.

I know the new sensors are 433mhz from the tire shops' tool. I didn't want the interference from the original sensor(s) so I didn't bring them an original (working) wheel to check (nor were they smart enough to do that, or try to sync the new ones before mounting as I asked).

 

Just so I'm not leaving a stone unturned...

What is the significance of the Ford/Motorcraft 'TPMS-XX' number?
I'm seeing the same part number crossing to 'TPMS42' and 'TPMS35'...
It appears there are many: TPMS-17, TPMS35, TPMS42, etc.
There appears to be some importance in other threads...

 

This might help you.

 

I don't know. They sure know how to take what should be so simple and confuse it all up and then cause us to over think the problem. I kind of wondered if the number wasn't in direct correlation with what the PSI on the door sticker reads. I plugged my VIN into one of the online Ford dealership parts lookup to get the proper MHz which was 315 and the Ford part number. Then searched Amazon for sensors using that part number. Now while the sensors I purchased has the number 35 on it, and my original tires and wheels were 20" SL rated tires. I used these sensors in 2019 Raptor wheels running 285/70-17 D-rated tires by Ironman in a AT tread. I am running 38# in the front which when heated up run at 41 PSI and 35 PSI cold on the rear that run around 38 PSI once heated up. The sensors work perfect.

If you will lay the sensors on top of the tires and follow the proper programming procedure you will know once they have sync'd up because your trucks horn will honk as confirmation for each sensor.

 

New 315mhz OE Motorcraft TPMS35 sensors (from R0ckAut0 $193.shipped) installed and working fine @an additional$83 in labor. They can be 're-learned' via the OM procedure involving letting air out, or with the $15 tool. Yay.

Here's what I learned-
The Ford dealer I purchased from also has other manufacturers, and they discount mail order parts for many. They use aftermarket parts diagrams for most including Ford. That aftermarket software gave me a wrong part number for my VIN. This dealer (who may be an advertiser here) know about this error because there is a 'note' in their POS system. They will not accept a return that is removed from the bag and almost a year old, despite acknowledging there is an 'issue'.

Ford.com parts searches resulted in the correct part number being returned.

The OE Ford sensors cannot be read with a scanner while still in the bag despite a few mile ride on my pass seat to 'wake' them.

The aftermarket MX (Autel?) brand sensors retail for. $60-ish (each) in my area, and they will not respond to the Ford OM 'relearn' procedure of letting air out. I don't know why, and did not verify; tire tech explained this. It will require a trip to the tire store to use the diagnostic tool to reset tire sensors after rotating or winter tires.

The aftermarket sensors are "clone-able", and will emulate the same serial number as the OE sensor it replaces. If that OE sensor has failed the 'tool' can find all sensor info it needs by plugging into OBDII.

The tire tech repeatedly tripped my electronic tailgate lock while using his aftermarket tool. He could not explain why.

Ford (and most manufacturers') TPMS technology sucks, and is incredibly expensive. The Feds need to sit down and develop a standard with all US manufacturers to reduce the complexity and expense of this technology quickly.

With a load requirement of 116 tire selection for a 17inch Raptor wheel that gives less than a 2% error over my stock 18in 275/65-18 Michelin (which will be replaced by snows in Sept) the E-rated Continental offers a much stiffer ride, and seems to be overwhelming the Lariat/ FX4 shocks over high speed bumps. Oh well.

I hope this helps someone, an I apologize to the OP for stealing and ranting in his/her thread.