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. However, a replacement key could aid in getting back on the road fast. A new Audi key costs between $280 to $475. https://g28carkeysolutions83978.liberty-blog.com/29928751/15-best-pinterest-boards-of-all-time-about-audi-a4-car-key-replacement