Opened my door this morning and heard a metal clang on the ground. How important is that little hinge?

 

That is the "prop" that holds the door open, it isn't really vital to have but can be an annoyance since the door will want to close by itself with any incline or slight wind gust. If you have the parts it should be an easy fix (probably just needs the pins replaced unless the metal piece is actually damaged), if not you should be able to find one in a salvage yard cheaply.

 

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Yea the metal piece went MIA lol. I need to go search the driveway for it. Thanks for the quick response. The door is also noisy as crap now opening and closing.