Audi tt 2001 not starting

Hello, You will want to scan for trouble codes and check your fuses. If you have a spare key, try it, and watch to see if the antitheft system is activating (owners manual for specifics related to your vehicle). If everything is ok there, address any trouble codes, listen to see if you hear the fuel pump running, and listen to determine if the engine sounds odd when you try to start it.