I have a Subaru Impreza, and I have just noticed a knocking noise from the front passenger side wheel area

if it sounds like a metel tapping its a wheel bearing

My Husband says it will probably be the CV Joint.

Could be your wheel bearings, get it looked at before it gets worse.

could be a bad wheel bearing or a bad cv joint also check for a flat tire lol good luck

l agree with Amanda, it is probably the CV joint and should not be driven too much until a mechanic looks at it. Also, if you have hub caps remove them in case someone put a rock in there - it is a silly prank but will cause a rattling noise.

It sounds like link rods.

Could be a wheel bearing, but its most likely the CV joint. I've got an Impreza and the same thing happened to me. It still drove fine for a whole month until l replaced it, but l had to keep putting grease in it. It should not be too expensive to replace, about $130 with parts and labor.