Rotten egg smell

My catalytic converter was replaced by Toyota dealer, free of charge. Had to take my car in several times before they'd finally take ownership of the problem. In fact, I had to open a case with their corporate office before I received the correct level of response. You have to be persistent. Upon detail investigation, they found one of the parts in the assembly needing replacement. Toyota dealers do have access to many instants of this particular complaint from around the nation. That said, the sulphur/"rotten egg" smell in my 07 RAV4 never fully went away. It got marginally better (may be psychological). In my opinion, Toyota is well aware of the issue and basically wants you to live with it.

Change the Oxygen sensor or circuit. This can cause the catylytic converter to permit the sulphur smelling fumes to go through. i believe that there is a product out there in the market for this very purpose. i don't remember the name. but you can ask. It is are sold at auto parts stores