Using the code while highlighting the will unlock a cosmetic "Chrome BMW" paint job, but not a new car model . Similarly, highlighting the Ford Bronco and entering the same code will fully upgrade that specific vehicle's performance, but again, it does not unlock other cars .
The easiest and safest way to unlock all cars on PC without using risky software is to download a 100% completed save file. This replaces your current progress with a profile that has already beaten the campaign, unlocked all standard cars, and maxed out multiplayer ranks. How to Install a 100% Save File: