How much is my used car worth?

I have a 2004 Honda civic ex v tec that i'm trying to sell as is. However it does have some issues but i'm not sure how much its exactly worth. The right side passenger and back seat doors have to be locked manually(by hand) it has been in a accident before as well. When ever i drive at night sometimes the headlights flicker i don't know if its an electrical problem or not it does not happen all the time. It has 239,000 miles on it. One of the rims is mismatched. The check engine light is on too but its a sensor i got the code read at auto zone so its a minor issue. It comes with a sound system and tinted windows. The tags expire next month. Not sure how much its worth so does anyone have any ideas?

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