keyless - physical buttons stopped working

[rollduck]

Hello everyone

Patient Fiesta ST 2014 and faulty key as in the subject. One day I locked the car using the physical buttons on the remote and the car stopped responding to them. The car opens normally with the button in the door handle, the key is normally detected in the cabin, the engine starts - everything works. The battery was replaced several times. I went to the "key specialists" - they took measurements and according to them, the remote control sends a signal when pressed, in short, it is functional. Unfortunately, I only have one remote control, so I cannot 100% verify which side the fault lies on. The car battery was also disconnected for some time - it didn't help.
Does anyone know what could have happened and where to look? Theoretically, can live with this, although it is a bit disturbing

 

[Intuit]

This risk of trying to reprogram the remote to your vehicle is that you may loose all access.
Buy another remote and follow the programming procedures.
Once that works, then try to reprogram the original.
In the states we often find inexpensive remotes over on Amazon.Com

 

[rollduck]

Thanks for the answer. Buying an additional key sounds good, but I'm afraid that I personally won't be able to add a new key - there is no such option in the user manual. Probably need an IDS, or maybe a Forscan application., but I'm not sure if I'm ready to add a new Keyless myself using specialized tools (I have Forscan) - still, there's a high risk of losing access

So I'll end up having to go to the dealer or an automotive locksmith anyway.

 

[Intuit]

Make sure that the key hasn't been restricted via the "MyKey" feature. (nasty trick)

Use ForScan to check for codes. Code for an antenna for example my explain the issue.

Per Service Manual, a maximum of 8 keys can be programmed to the vehicle.
The car will not start unless there is a minimum of two keys programmed to the vehicle.

Attached a diagnostic document. "2016 Ford Fiesta ST - Passive Anti-Theft System (PATS)".