Let's assume it was freighted as depicted in the movie and remained intact thru the entire sinking:
If it DID survive, there'd probably be nothing immediately recognizable as an automobile left, without sifting thru a mound of rust. Perhaps a few bits of brass trim (headlight rings, ornaments, door handles), a lump of engine block, the tires and perhaps a few wheel spokes... most of which would be buried under perhaps a foot or more of fallen rusticles. An ROV might pass over it several times without an operator ever seeing it.
If it was crated, the crate might have been destroyed by the descent or shifting cargo as the bow became vertical... or during the violent shock of hitting the bottom...smashing or scattering the contents, making recognition even MORE difficult.