Your car feels light on the steering on one side?

What do you mean by light? like lose? start by jacking up the front end and shake both front wheels, one at a time, from side to side, look/feel for any kind of 'play' if there is some kind of 'play' or movement than it can be the 'tierod' or the 'rack and pinion.' Depending on what make/modle the car is. Try that first.