Why doesn't the car detect the key?

If your car doesn't detect the key, it's usually due to a problem with the proximity system or the integrated transponder. The most common causes include dead batteries, faulty receiver antennas, reprogrammed security modules, or external interference that prevents the signal from reaching the vehicle correctly. This malfunction means the vehicle won't unlock or start, as it doesn't recognize the key as valid. A specialist can diagnose the cause and restore synchronization by reprogramming or replacing the key if necessary.