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what doesn't make sense is that MRF states that the rear 02s are acutally helping apply minor changes to fuel trims. Hows' that? If it's reading post cat, everyone who has either no cats is screwing up the fuel trims. I would love to see a log posted of a catted car vs no cats. I can't imagine the input from the post cat is that much to really alter the trim tables. It must be ver minor no? And it's really kind of manipualted via the cat in place. As a secondary method of montioring it kind of makes sense. But from your post, these 2nd 02s play more of a role than people think?
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