How to Save Money on Audi Battery Replacement Does your Audi key fob experience difficulty locking and unlocking? This could be a sign that the battery needs to be replaced. To replace the battery, open the key made of metal and use a flathead screwdriver to open the back cover. https://g28carkeys96202.blogzet.com/10-audi-a4-spare-key-related-projects-to-stretch-your-creativity-44626091