Just wanted to let you guys know something I observed at the track this past weekend. I've got a CEL - P037, and I've had it for close on to 6 months. To my knowledge it's the rear O2 sensors. I've got test pipes, and I've used the non-fouler trick for almost a year before this CEL showed up. The car hasn't had any noticeable performance or drivibility issues, so I've ignored the CEL.

I've seen numerous people attribute poor performance to rear O2 related CEL codes. While at the track, cleared the code with a pocket scanner, and noticed zero difference in trap speeds. Of course, it came back after a few runs, and I still saw no difference in traps.