dunno if anyone has had this problem before, ive had a new n/s lower arm fitted due to worn ball joint, that cured one knocking just recently its started again but isnt consistant sometimes its on the right and sometimes on the left, 3 separte garages have looked at it and said there is nothing visible no play anywhere but the agree there is a knocking. seems to be more so when driving over a speedhump. its driving me insane! had tracking done too. still no better.