If you have a garage door that has been hit by a car, there are a few things you can do to fix it. First, check the tracks to see if they are bent or damaged in any way. If they are, you will need to replace them. Next, check the springs to see if they are broken or damaged. If they are, you will need to replace them as well. Finally, check the opener to see if it is working properly. If it is not, you will need to replace it.