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How to Open a Audi Car When the Key Fob Wears Out Audi offers lux features to their drivers, such as keyless entry. It's a convenience that can be useful during your Winona drive when you have hands full with food, kids or other gear. For these features to work, your car must have a working key fob. As time passes, your car's key battery can be worn out. Learn how to open your Audi