Does a 07 mazda 6 have 2 catalyst convertors?

What are the codes?

If it is 'California' emissions then it has two .It sounds like it would be worth at least having it diagnosed at the dealer , then possibly ask friends etc. for references to a trustworthy shop in your area to do the repairs. Beware...if you have emissions inspections in your region , some aftermarket converters will not perform efficiently enough to pass inspection , depending on how they do the testing. On a lot of newer vehicles software problems can mis-interpret sensor inputs and cause 'false codes' or errors leading to (unintentional)mis-diagnosis. NOT that this is the case , but at $1200.00 , might be worth a check-in at the dealer. Good luck. ZOOM ZOOM?