P1283 is a O2 bank 2 sensor 1, so I had replaced it with a Bosch Oxygen Sensor 15667 in hopes it would fix it, but it didn't. I have already tried deleting the code with a OBD2 scanner, I've rested the ECU, and I used a Catclean fuel cleaner, but I still got the code popping back up. can anyone please help me.

The car is bone stock and has 100,000 miles

 

I'm also getting this code, did you figure out whats happening? Thanks

 

I am replying here so that I can keep track of this thread.

 

I have that code as well..

 

I got the same code and changed the a/f sensor. But the same code came back two months later. It seems to be exhaust leak near the manifold and cat. I am going to inspect the parts and gaskets and hope to find the leak. Hope this would fix and clear the code

 

P1283 - Air Fuel Ratio Sensor 1 Lean Shift Monitoring Bank 2

This can also be caused by an intake manifold vacuum leak. Inspect your PCV hoses (3 total) for cracks/splits & brake booster hose connection. Also inspect your intake tube between the MAF and TB for any cracks. Lastly, if you've done any mods like a plenum spacer, I would double check all the plenum sealing surfaces for leaks. In rare cases, a very badly leaking valve cover can actually introduce unmetered air to the PCV system, not something I've ever seen on a 350Z, but I have seen a blown rear main seal on an Audi cause poor running conditions from unmetered air entering through the PCV system.
Good Luck!
-Icer