What are the reasons for Volkswagen displaying 'nokey' and failing to start with one button?

[DiGraham]

Volkswagen displaying 'nokey' and failing to start with one button may be due to the following reasons: 1. Insufficient key battery: Unable to emit a stronger radio signal for the sensor to receive, thus displaying 'nokey' when starting the car. 2. Interference from in-car devices: Such as heads-up displays, navigation systems, tire pressure monitors, etc., which may interfere with the sensor receiving signals from the key. 3. Sensor malfunction: Sensors for detecting the key are located under the center console and under the rear seats, among other places. If these sensors malfunction or their connectors become loose, the vehicle may fail to detect the key. 4. Insufficient vehicle battery power: If the battery power is insufficient, it cannot supply power to the vehicle's electrical devices, naturally making it unable to detect the remote key.