throwing 2 codes i can't find any info on.... 23 and 1

[zerepdivad]

Ok so i'm having idle issues with my sohc 240sx. it's idle is extremely lumpy up down up down, and sometimes dies out. my ecu is throwing me 3 codes 23, 45, and 1.I found 45 to be injector leak or rich condition that can't be fixed. But am having no luck finding what codes 23 or 1 are.... i've double triple and quadruple checked codes on the ecu and same 3 pop up each time....

Just wondering if anyone has had these codes pop up or if anyone knows what these are.thanks