So I posted this on CT and wanted to know if anyone can help me out over here. I have a 2008 toyota tacoma, v6, automatic, access cab, trd sport, 4wd. I installed the doug thorley long tube headers about 2 months ago. After I put it in, I drove it around for a while and about a couple weeks later, I put the URD o2 sim. The CEL always kept coming on so I pulled it out and put the wires back. I put the empire o2 sim in about a week ago. That didnʻt help either, still had the CEL. So yesterday I installed a scangauge and it gave me a p0300 and a p0051 code. Anyone know or can help me out. I know what the codes mean but I donʻt know where to start.
Thank you in advance.