Fixing a car in “Cyberpunk 2077” usually doesn’t involve a manual repair process by the player. Instead, cars that are damaged in the game typically repair themselves over time. If you leave a damaged car and engage in other activities or missions, when you return to it later, you’ll often find it restored to good condition.
If a car is critically damaged and unusable, you may need to find another mode of transportation and come back to it later for it to respawn in a repaired state. Also, calling a different vehicle from your garage can also be a solution if your current vehicle is too damaged to use.