#560, "RE: AFC blue wire mod and the actual O2 reading (long)" In response to In response to 1
I agree, it's probably because you've got two things hooked up to it at the same time.
I also have a CEL with the SAFC. I don't know what the light is for but I'd guess the safc is causing it. I can't be sure because I had the safc on for a while and there was no cel light, and the light came on after I adjusted it slightly lean, but not immediately after I adjusted it!
go figure, damn if I know why it would wait before giving me a cel, maybe I didn't get the connections as good as I thought.