2004 Open Road Trailer My Car Is Making A Knocking Sound From The Front Left Hand Side?

My car is making a knocking sound from the front left hand side? - 2004 open road trailer

I am the owner of a book that I began to believe that it is a lemon. I have a 2004 Ford Focus sedan. When I'm on the road, I hear a knocking noise coming from the front left. Seems to happen when my speed is 60 to 80 kmh (30-50 mph). I religiously and regular maintenance of the vehicle when the noise started to happen, I have it, Ford and Midas, could not find anything. All ideas, which may cause his name? The noise starts going crazy.