How to Reduce the Cost of an Audi Replacement Key If you own an Audi key to your car is something you never want to lose. A replacement key will allow you to get back to driving in a hurry. A new Audi key could cost between $280 and $475. https://g2809974.spintheblog.com/30474792/7-simple-secrets-to-completely-doing-the-audi-a4-car-key-replacement