I installed my new tires and wheels today, BFG K02 on stock cast wheels. I went up to 275/70-18 and gained an inch to just over 33", and of course these are LT tires which I prefer for the rocky terrain I deal with. I plan to use the original too-shiny wheels to mount real winter tires.

A couple of months ago, I had Discount Tire mount the BFGs on the wheels, with TPMS valves I got on eBay, from a highly rated seller that claimed they were new. I also bought a TPMS reset tool.

I checked the TPMS system yesterday with the original wheels, and it worked as expected. After I installed the new wheels today, I set pressures all around to 42 psi (based on a pressure-load calculator), and then drove for about 15 minutes. No error messages, and when I checked the TPMS dash display I saw 40 psi all around. I thought, cool, the system learned the new tires without any additional work.

To confirm, when I got home I added another 6 psi to the front right making it 48 (actually 50 since it was warmed up), and went for another drive. But the dash display stilled showed 40 psi. OK, I thought, it needs to be trained.

So I started the process with the ignition on and 3 cycles of the emergency flashers. When it showed "Train front left tire" I tried the reset tool, but got no response. I tried this twice more but no luck. Then I tried the method of letting air out of the tire. I dropped the pressure by more than 10 psi, but still nothing. One more thing: I had a hard time getting air into my front left--maybe the valve/sensor is screwed up.

Does anyone know how low the pressure has to drop to trigger the TPMS training? Any other suggestions? Any way to check the sensor without unmounting the tire?

Anyway, here's a photo of the new and old tires for size comparison, and the new set on my truck.

 

I went with a set of factory sensors in my winter tire/rim combo just to ensure compatibility. When I do the switch overs it seems to be about a 5-8psi drop during the learning procedure for the truck to recognize each sensors position. Hopefully you get it sorted.

 

I ended up at the Discount Tire shop that mounted my tires. The tech used a hand-held sensor tool to first check and wake-up all the sensors, which tested good. He then connected the tool to the OBD port to reset the system. That triggered a TPMS error on the dash display. He then went around with the tool to each sensor again, and that cleared the error and brought up the correct tire pressure readings on the display.

 

I have 2 sets of tires and wheels. Last year when I put my winter set on my 2021 F150, the truck automatically recognized the sensors and tire pressure. The same this Spring with the "summer" tire/wheel set. Well now, this Fall, the truck failed to automatically recognize the sensors and tire pressure (like it did last year). What gives???

 

Last week I switched back to my original wheels (with new snow tires mounted). The truck automatically recognized these after two short drives, and the TPMS works fine.

 

Are the old wheels stored near the truck? Apparently this can confuse the system.

 

I didn't bother putting sensors in my winter tires. my summer tires are stored right behind the garage door and truck parked right out side. so everyday when she's parked overnight, I think she senses tire pressure from the summer tires inside the garage but as I drove off in the morning, she will complain about not sensing tire pressure. by the end of winter, I'll confuse the sh** out of her. lol

 

I have winter wheels and tires and when I swapped out the wheels the truck recognized them. Will see in the spring if it will recognize the originals.

 

No.

And my F150 recognized these same winter wheels last year, on its own, without issue. And my Ram would do the same for 10 wheel change overs without issue. My VWs just have a TPMS reset button in the glove box, easy peasy.

It's like Ford overcomplicated their TPMS just to drive business to the stealerships.