What does it mean when a key symbol appears on the Audi A6 dashboard?

[DelTravis]

Audi A6 dashboard displays a key symbol under the following circumstances: Low battery in the remote key: This prompt will appear on the dashboard. If you're unsure whether the car's remote key is functioning properly, try replacing the remote key battery with a new one first. The yellow key warning light is likely the engine immobilizer system alert. It's advisable to check if the smart key battery is depleted. Vehicle anti-theft system activated: Of course, when the remote key battery is low, this reminder will also appear. In this case, the remote control battery needs to be replaced. For new cars, you can visit an authorized dealership for assistance or use their diagnostic computer for testing. Alternatively, it might simply be that the car key battery is dead - try replacing the battery first. If the issue persists, it's recommended to visit a professional repair shop to identify the specific cause.