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Key proximity does not work

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Location
Kranenburg, Germany
#1
Heyya all.

I have a 2015 Fiesta ST 3 door EU model, with the push button start. I got it late last year, and since I have it, the key proximity does not work.
I can only start the car if i hold the key to the icon on the steering colum. If the key is anywhere else, i get the Key not detected error. What i tried so far:

IT'S NOT THE BATTERY!: My first troubleshooting step was to replace the batteries in both of my fobs. I tried new Varta, Duracell
and Panasonic batteries, but i have the same problem. Also the lock\unlock buttons works at 10s of meters.

I checked the DTCs with Forscan, but there is nothing.

I brought it to a key cutter, who tried to program the old keys, and some new keys, but he always got an issue when he tried to program the proximity key.

I replaced the proximity sensor under the armrest, but nothing happened. (Do i have to do something in Forscan after I replace the proximity sensor?)

The boot button is working when i have the key in my pocket.

I'm starting to run out of ideas, does anyone occured anything like this, or have any idea what is this?
I would really like not bring it to Ford, as they would charge probably hundreds of euros, and i don't need the fix that much.
 




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