Transmission issue or catalytic converter??

It is likely a transmission issue with the codes you have. If you have less than 60,000 miles on the car take it to a dealer. They will replace it under warranty.

THE CVT TRANSMISSION IS FAULTY ON THAT YEAR. GO TO BBB.COM FILE COMPLAINT EVEN IF ITS ALREADY FIXED. THERE NEEDS TO BE A RECALL DONE.

I know this was a long time ago, but how did you end up fixing the problem? My 2012 is doing the exact same thing. Was it the CVT or the catalytic converter?

Get your Vin call Nissa. And check for recalls..I have a 2006 4x4 Titan ..I changed the O2 a d driver side cat and all spark plugs myself..still seems like it's choking and won't go over 30 mhp...I called Nissan vin Check for recalls for 2006 recalls are on air conditioning motor....fuel level sender and the big one...ECM...which controls all Function if fuel and ect... that would probably explain. My cylinder 5 misfire code and random misfire code as well