How Do I Fix My Audi A2's Central Locking System?

My Audi A2's central locking system is not working properly. It either doesn't lock or unlock all the doors, or it only works intermittently. How can I fix this issue?

First, make sure that all the doors are closed properly. If that does not solve the issue, try replacing the battery in your remote key. If that still doesn't work, you may need to have the central locking system checked by a certified mechanic.