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I'm lost. What exactly is the MIL eliminator/O2 sensor and whats the egr for? Does getting an ORP effect these? And how?
 

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02 sensors plug into your exhaust in order to moniter it, relays info to the ECU. Any cat-less systems will effect these, throw a Check Engine Light. EGR is Exhaust Gas Recirculation system in which at idle and I believe constant speeds a valve is opened in the system that a small portion of the exhaust to reenter combustion chambers. Simply put, it reroutes some exhaust back into the engine with the new air/fuel cycle. It turns off at WOT, too.
 

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MIL is synonymous with CEL
MIL = "Malfunction Indicator Lamp"
CEL = "Check Engine Light"
 
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