Why does the Passat display 'Key Not Found' while driving?

[SophiaRose]

It is due to signal interference in the vicinity. The vehicle will return to normal once it moves away from the affected area. The working principle of the keyless start system: The vehicle is equipped with multiple antennas that emit radio waves to search for the key. When a valid key is detected, pressing the start button will allow the engine to start. If no valid key is found, the system will not permit starting and will display 'Key Not Found'. Here are additional solutions: You can bring the key closer to the start button. Since the sensor for the keyless start button is located near the button itself, placing the key close to it enables the sensor to better detect the signal emitted by the key.