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Actually Yes for both....if the ecu is designed to be using EGR, it should be displaying a CEL as the EGR valve is missing (along with the DPFE sensor that controls the flow to the EGR valve). If your ecu is running in a CEL For an emissions issue it then defaults to a generic setup to run the vehicle as the ecu is getting the required metering. And it is designed to reduce emissions (are prolong life of catalytic converter) by recycling exhaust gas back through the intake.
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