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Re: Failed inspection
High NOx usually means the EGR system is not working or the ports on the intake manifold are plugged. Honda has tests to check the EGR valve and also to determine if the ports are clogged. I gather you checked the ECU and there are no stored codes. Did they give you a print-out of the test? It helps to have all the varius tested numbers and the max to pass to help evaluate the problem.
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