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I still need to do the MIL trick on mine. However, the rear O2's do absolutely nothing to regulate fuel, emissions, etc on your Z. There are just there to "tattle tail" to the ECU if your Z is putting our too much CO2 and cause the check engine light to go on, hence not needed. I have had mine completely disconnected for quite some time. They pretty much are a resistor spliced between the plug and O2's.

Regards, Chuck

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