I recently got myself a 2003 g35 coupe fixer upper , the codes that are showing is p0031 & p0038 .replaced the o2 sensors both of them and cleared the codes ,drive it around and park and turn it back on the codes come back looked for broken wires and nothing checked the fuse and nothing at this point I’m just tired of it ,is there any other fuses or relays that can cause this ? Please let me know