My car is throwing a CEL 67. I received a used O2 when I purchased my Hytech from a member that was already extended but my car just began throwing the light. I still have my original O2, so I was thinking of extending that. Any insight on this would be appreciated.

Also, I noticed that the O2 on now was more of a brownish color than my original O2. Is that a sign of anything? Should I check the voltage on the secondary O2 now rather than extending the other one first?

 

Anyone?? Would I be better off asking this in the tech forum??