Hey guys, I picked up a 06 6MT 350z a few days ago. Drove it around and it felt fine, but on my way home from purchasing it, the SES light popped on.

Checked the codes and got P2A03 for bank 1 & 2 for sensor 1. Fast forward to the next day, I had cleared the codes the night before, but the SES popped back on on my way home from work. Cruised back to O'Rileys to find P2A03 & P2A00 for sensors 1 on both banks. Due to it being different from the first time, I cleared it again. Later that day I got the exact same codes and decided to clear it just once more to make sure that those were the codes I needed to deal with.

Yesterday the SES comes on again. I decided to have a friend of mine check it with Nissan Datascan and to my suprise we found new codes. 3 codes this time, P0550, P21000 and P21003. P0550 seems like an easy fix, but the other 2 have me stumped. Do they have something to do with the P2A03 and P2A00 codes the car was throwing? I haven't had a chance to check for exhaust leaks, but according to what I have read they are usually the cause of the codes I was initially seeing.

Any input would be greatly appreciated!