I bought my car brand new and after 60K miles I had problems with the car. I had the cat replaced and I still had problems. I have been into service my car so many times for the same problem. The car makes noise, it stops, etc. I am having the cat and engine replaced right now and I am waiting to hear from Nissan. I have been told that my car has over 80K miles so they cannot help me and my vin number is not included in the recall. I am sick of Nissan and I will never buy another one. I would love to be included in a class action suit. I feel that Nissan should pay me for the repairs, and rentals. This car was poorly built and Nissan knows this. Anyone who is considering buying a Nissan should really think it over. I hope Nissan pays everyone for the damages, but I am not sure. Good Luck.
I have an 04 Altima and suffered from complete engine failure, previously I also had trouble with the catalytic converter like you.
These common problems were mentioned in the reviews, which I never read prior to purchase.
I usually read reviews before buying other brands but I have always been loyal to Nissan (my previous car was a 98 Altima which ran perfect!) and the 4 other vehicles I owned from them were problem free, so I bought without thought.
I will give Nissan another try, but will be reading and doing research first!