I've got a feeling that mazdarx wants to create a selection around a car for the purpose of recolouring it (call me a mind reader) and is looking how to do that.
mazdarx, I did give you a suggestion in the very first reply that you haven't even responded to. Using the Magnetic Lasso. Did you try it?
If you want to create a selection around an object that has a highly contrasting background, that tool may work for you.
A photo of a car in a parking lot with a complex background (for example) is a different thing all together. Short answer is NO, there is no automatic way to do it. You will have to create a selection using either Lasso's, the quick mask, the Pen tools, whatever you are most comfortable with (or even just erase the background with the eraser tool). For a car, I would use the pen tool myself and convert the resulting path to a selection.