You just need the car to work. You don’t have to drive it anywhere. This just means that the auto turret needs to be dead and then you need to trigger the cutscene in the garage. After witnessing it for awhile you can leave and the car will work in later levels. You don’t actually need to drive it anywhere as it spawns at the beginning of every map from then on.
Oooooooh I see! I actually didn’t know that, huh. Thanks a bunch.