Car door repair when you have a hinge that is a little loose, or isn't letting the door latch all the way, is a very straightforward process for any do-it-yourselfer.
Step 1 - Check Car Door
Before tackling any bolts or hinge adjustments, check the door to see if there is any weather-stripping that is loose and getting caught in the hinge, or latch. If so, then either glue it back in place or cut that piece away and replace it.
Step 2 - Raise Door to Right Height
When you open your car door and it sags towards the ground, you should pick it up to see how far it is traveling. Before any car door repairs are made, you should see if the hinge pin is loose or has worn away the metal. If that is the case, you will need to look into replacing the hinge assembly.
Step 3 - Tighten Hinge Bolt
In most cases, if the car door sags when opened, the bolts are loose. Simply grab the right sized ratchet wrench and tighten the bolts. Keep the hinge straight and the door lifted with a stand and blocks of wood or a car jack under the door.
Step 4 - Check Fit
Once bolts are tightened, check the door for a secure latch. If it still travels, then retighten bolts paying attention to not let the hinge travel.