Falcon key battery issue

The symptoms definitely point to a weak or dead key fob battery. The keyless system needs a certain voltage to operate correctly. The error stored in the memory is likely due to the low voltage. Have you tried replacing the battery in the key?

Thanks! No, I haven't replaced the battery yet. I wanted to check online first to see if there could be other reasons. If a low battery is the problem, can I fix it myself, or do I need a workshop?

Replacing the battery in your key fob is usually simple. Check your owner's manual for the correct battery type (most likely a CR2032) and instructions. Given the stored error message, it might be worth having a workshop clear the error memory after replacing the battery to ensure everything is functioning correctly. You could still replace the battery yourself, but if issues persist, professional diagnostics might be necessary.

It was the battery! I replaced it, and everything is back to normal. Keyless entry works, the car locks and unlocks perfectly, and after clearing the error memory (which cost me 37€ at the workshop) the error is gone. Thanks for the help!