Quote Originally Posted by frosty View Post
Also your rear o2 bias voltage should be changing up and down. Pegged rich like that could indicate something is going on. Sorry im not being more specific, Im just pointing out a few oddity's.
The one that is pegged is labeled O2S12. Safe to assume the reader is calling this bank 1 sensor 2 which would make it the downstream correct? And if it is could I possibly be looking at a dying Cat?