My 17 has a time consuming process of learning the position of each tire. In the proper sequence you've got to go around the truck and lower air pressure until the horn beeps.

 

 

Multiple threads on this topic on this page.

Long story short:

Many of us have no problems with the system auto-learning. Put your new tires on and go drive, and within a few miles, they will register correctly. This worked on my 2016 XLT. Verified by putting a significantly different pressure than the tires I replaced, then putting them at the right pressure after verifying it had learned.

Others say it doesn't work and you need a tool, and then follow a sequence. That is what I do on my old 2007 Explorer.

Good luck. I suggest trying out the auto-learn first.

 

The difference may be the requirement for different pressure in the rear from the front on some trucks.

 

I had an incident where my new sensors wouldn't auto learn. I bought new oem sensors and had them installed with my new rims and tires. I drove home 30 miles from the tire shop with the old rims, tires and sensors all intact in the back of my truck and about 5 miles down the road the light on the dash came on. I assumed it was because the sensors in the old tires was confusing the system. When I got home and got the old tires/sensors out of range I tried the auto learn procedure in the owners manual a few times and it wouldn't work. A couple days later I stopped at a Ford dealer and they tried with their reset/relearn tool and it wouldn't work. At this point the dash light was on for a couple hundred miles. I went to another Ford dealer and they discovered one of my new sensors was bad so they replaced it and got my sensors to work.

 

I bought a set of 2017 take-offs that came with the factory OEM TPMS sensors, and the truck self learned/registered the new TPMS without any intervention from me at all. I know it's not picking up my other wheels with TPMS sensors, because those wheels are in my storage unit 10km away from home. Tire pressures show up just fine in the dash, but I'm sure the location of each TPMS sensor is not correct, but I've been too lazy to let all the air out of the tires to resync them.

 

Most cars after around 2012 have some sort of auto-learn cycle - I think ALL cars after around 2015 or so.

Regardless - 2012, or 2019 - you can always go back to the button cycle to put the car in learn mode - and relearn, re calibrate the system. It's in the manual but some button sequence will make the horn honk I think 2 times - then you go Driver Front - reduce the PSI and air back up to normal - honk, then Pax Front - repeat around the veichle - 2 honks when finished and it's relearned the sensor ID's and recalibrated to normal.

Now on that front - Forscan can put the veichle in learn mode - and I think you can even override the calibration pressures but I've not looked into it - should be a thread on this too. My 2016 explorer will auto learn but only if there are no other issues. IE new sensor ID's it won't autolearn those. Or it didn't want to I might should say. The horn honk process fixed it.

Point is - only real reason you need a tool is when the sensors are wonky. If one is putting out errors or bad data - the system will think something else is wrong - and the tool will show you which sensor is acting up. At that point I let a tire shop check it as often the sensor is wonky and I want it removed anyway.

 

So how do you reprogram the TPMS when all the pressures on the dash show - - - ? I lost the pressure readout when trying to turn on the global window open feature with FORScan. Returned everything back to As Built and it still shows dashes. Probably need the tool to reteach them. Not sure why they disappeared in the first place.

 

use the horn honk method. There is some combination of button or key procedure that starts the TPMS relearn procedure. It's in the manual I think, or well someone on here has posted it by now.

anyway like posted above the horn honks and then your lower the tire pressure of the driver front - honks again, then raise it back up - honks again - move to the passenger front - rinse and repeat 3 more times.