If you’ve ever had to replace the car battery in your MK1 Audi TT, you may have encountered the words, “SAFE” on the screen of your radio. This message comes up the first time you start your vehicle any time your car is disconnected from the battery. This can be from replacing your battery, or even jump-starting your battery after it has died on you. Either way, you will need to know your four digit code for your vehicle’s radio, and you will also need to know how to enter the code to bypass the “SAFE” screen.