Definitely not a glitch, I've been chasing this fault for almost a month now, I need to pass emissions. I got an extension from the State for a month to fix it. I thought I had it with the new knock sensor but I got a check engine light a couple days ago. I fixed 1 error just need to find which o2 sensor on my driver side that's giving me the other fault code by April 6th, my deadline, doh! I might just have to change out both unless my fault returns today.