What to Do If You Lose Your Audi Key It can be expensive to replace lost keys. Luckily, with some simple steps you can avoid the expensive replacement costs and hefty towing charge. First, you should check if you have an extra. If not, look in obvious places such as https://g2823931.thezenweb.com/10-audi-a3-key-replacement-tricks-experts-recommend-68003516