Is it a squeaky old door sound or a tire squeal or like something is jiggling around?? Does it happen when turning the steering wheel or just when rounding the turn? Is it constant, intermittent or random? Does speed affect the noise? Get specific, or it's gonna be SUPER difficult to diagnose from "makes a noise when turning left".
If it's old door when moving the wheel, that's a ball joint. If it's tire squeal rounding a turn, that's alignment. If it's squeaking like something is loose, it could be a variety of things.