P1273 Code Possibly Fixed
Hello everyone I just wanted to add this here if maybe I can help someone who comes across a similar issue. I had this code off and on for about a month now I thought I looked everywhere. I smoke tested my vacuum lines and everything and never found any issues. I took it to a shop which basically told me they didn't know but it could be because my valve covers were leaking into my spark plug tubes (which they were). A valve cover job later the issue was still there. I gave it one last effort and was looking around on my header which is where the crack would have to be. And wow there it was. I had a crack right before my first O2 sensor. I took it off and had it welded. I will be installing within the next couple days. To confirm if that was the issue. I highly suspect it was. So expect an update soon. I'll attach pictures below of before and after.