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://auto-locksmith37248.thenerdsblog.com/35435029/10-no-fuss-methods-to-figuring-out-your-audi-a4-car-key-replacement