How to Reduce the Cost of an Audi Replacement Key If you own an Audi, the key to your car is something that you never want to lose. But a replacement key can help you get back on the road quickly. A new Audi key costs between $280 to $475. https://carlocksmiths21334.answerblogs.com/30045352/10-things-you-learned-in-kindergarden-that-ll-help-you-with-audi-a4-car-key-replacement