I need to figure out which o2 sensor/s I should replace. My car from what I think was running very rich causing a catalytic converter to become clogged. I decided to gut the cats and now am wondering which o2 sensors I should replace..becuase I am assuming my old ones are bad. I do not remember the exact code it threw but it said not enough H2O's B1 S1 and B1 S2, maybe. Not exactly sure. But if a cat becomes clogged would it be more so from... the upstream sensors?
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