REPAIR DETAILS

Check Engine Light. I have a scanner and got a P2A03 code, O2 Sensor Circuit Range/Performance Bank 2 Sensor 1. I changed O2 sensor on Bank 2 where it says. Ran it and after 40 miles then got P0301 code. This code is for spark plug coil. i checked and all fine. I also replaced plugs and coils last year. reset code and drive for 30 miles and P2a03 code came back. Looked in nissan forum and it said to reset ECM. I followed instructions and reset ECM. Not sure if check engine light is supposed to go off. I don't want to reset codes and drive to see if comes back. If I have to do that then I will but looking for someone to diagnose and fix. I put $350 as budget but if it is more I will consider it depending on what needs to be replace.