If you already own the game legally but want everything unlocked (money, cars, licenses), do not look for a serial number. Instead, download a 100% completed savegame file from Nexus Mods or TDU Central.
Every "free serial number" list on the first page of Google has been tried millions of times. Publishers like Atari and Namco have blacklisted these keys. If you try to install TDU2 today with a public key: Test Drive Unlimited 2 Unlock Code And Serial Number
Let us clarify the terminology, as many players confuse two different things: If you already own the game legally but
Most people searching for a "Test Drive Unlimited 2 unlock code and serial number" actually want two separate things: a way to install the game (serial) and a way to skip the grind (unlock). Most people searching for a "Test Drive Unlimited
There is good news. You do not need a shady unlock code. The community (Project Paradise) and legitimate storefronts have solved this.