Car is making a knocking and squealing sound on the front drivers side

Your noise is most likely 1 of 2 things: wheel bearing or c/v axle on that side. If vehicle was struck on that corner in accident. The accident was most likely the cause and was not repair do to noise coming from splash guard covering it up. But splash guard should have been repair after the accident as well... Then,they would have heard bearing noise too... Someone didn't do a very thorough job on this one. I could be wrong however i'm just going by what you are telling me and without a torough check. This is the best I can give you. Thanks, Autotech38