Hello. I have 04 Sante Fe with a 3.5. Code PO431 came up so I installed a new cat on bank 2. The one I removed was shot. While looking into this problem I read that this is usually caused by a missfire. I had no missfire before i changeb the cat and now there is a bad missfire.
Does anyone know if this sounds right and is there a way to confirm this. I am not sure of all the symptoms.
Thanks
Dave