How to Reduce the Cost of an Audi Replacement Key If you own an Audi, the key to your car is something you don't would like to lose. A replacement key will enable you to return to driving quickly. A brand new Audi key will cost between $280 and $475. https://car-locksmith54274.blazingblog.com/29935004/17-reasons-why-you-should-avoid-audi-a4-car-key-replacement