"Fault in identifying the mechanical/electronic key or hands-free remote control located in the reader" In simpler terms, your car’s Body Systems Interface (BSI) —the "brain" that manages electronics—is saying: "I see a key, but I don't recognize it as the right one"
Wait , then disconnect the battery terminal for 15 seconds .
: Check the BSI fuse box for any blown fuses, specifically looking for those related to the immobilizer or central locking.