I have a sewer smell coming from my toilet. I have had some rocking of the toilet so it might be the wax ring. If I remember, the flange was partially broken which caused the securing the toilet with the bolt a difficult thing to do. I would hate to take the toilet up if this is not the problem. My other issue and possible cause is that the toilet is not vented properly. the venting ends in the basement. There is a cover on the pipe. When I remove the cover, I smell the odor. If I vent, will that take care of the problem?