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Message: <blockquote data-quote="wfooshee" data-source="post: 689930" data-attributes="member: 6354">Not sure, but I don't think so. The PCIII does nothing but modify the ECU's fuel mapping by raising or lowering the squirt volume based on its RPM vs. throttle-position table: At such-and-such RPM and such-and-such throttle percentage, add or subtract this amount of fuel from what the ECU called for. It has no feedback, and no monitoring capability, just modifies the flow.Plugging up the O2 connector gives feedback to the ECU that it can use to try to "correct" the modified fuel flow, which is why I said it "chases" the PCIII.Differences in Gen1 and II aside, the PCIII's function is the same in both. Modify the fuel flow according to a table of RPM vs throttle position.</blockquote>