Sorry in advance for the long thread. Not too 100% concerned about this code but I do have a couple questions as to why it’s firing being that I replaced these not even a year ago. The code is a p0420 and I’m just trying to make sense of it. Car idles rough for a while and then it goes away and when I try to drive rough(cause my neighborhood sits in a pretty **** spot) I can’t get past 4000 rpm before it sits there and bogs down not letting me rev past that for a bit before it decides to clear up and accelerate. It’ll not only happen in first but in almost every other gear when it decides to be temperamental. Other than that she runs pretty good. I’ve tried a/c on and off and still does the same thing. The next time it happens I will try to make sure to record and post it on here but for right now that’s all the info I got. Thanks in advance