P0325 code Help!!

Hey, so a while back i got a CEL for a knock sensor being bad, so like anyone else i replaced the sensor and cleared the code. However, now the CEL is back and saying this (check photo below). I don’t know what to think now, i know the sensor that i replaced is good but i don’t know what is causing this. I also think this could be the reason for the High idle problem that i am also having. I’m sitting around 1000-1100rpms. i would appreciate any help or possible troubleshooting help if any. Thank you!!

1995 S14 240sx Stock Ka24DE