Why can't the Audi A6 detect the key?

[XavierLynn]

Audi A6's inability to detect the key is usually due to insufficient battery power in the key or signal interference. Replacing the battery: The first thing to consider is whether the key has run out of power. The remote key typically uses a standard button battery with a rated operating voltage of around 3.3V, and under normal circumstances, its lifespan can generally reach 2 years. At this point, you can press any button on the key to see if the indicator light turns on. If it doesn't, the battery is dead and needs to be replaced. Another possibility is poor contact of the key battery. You can remove the key shell, rotate the button battery, or take it out and reinstall it after a while. Trying the spare key: Take out the spare key and test if it works. If it does, it indicates that the previous key is faulty and needs to be replaced. If even the spare key doesn't work, then other causes should be considered. For example, check if there is any electromagnetic interference or signal interference sources nearby. Some dash cams, if not properly shielded, can also cause interference, preventing the key from being detected.