Sup guys, I've got a 2000 Civic EX Coupe. My CEL came on a couple days ago and its usually the knock sensor. I reset it and it doesn't come back for another 2-3 months. This morning it came on again and its giving me 1 long blink. I believe this is for the Primary O2 sensor, but all the information I am finding online says Civic 86-98. I'm just wondering if I am right in assuming its the O2 sensor. Thanks for the replys.

I searched but couldn't find anything on CEL Code 1