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  1. Engine Management
    my 98 civic lx WONT pass smog! it passes at 15mph but 25mph it measures at 61 HC (PPM) and the max is 49. I've replaced both o2 sensors, new cat, new distributor and wires, new NGK plat. plugs, new fuel filter and fuel pump.... ANY CLUE as what is causing the high NOX readings? Engine has 235k...
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