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the NOX is the Oxides of nitrogen, ppm stands for parts per million if the NOX is high its due to higher cylinder temps, so prob an egr or car was runnin for a while before u got the test, or maybe he dident put the fan in front of the car like hes suppose to. shame the dude that does the test dont know you, if he was your bddy all u=youd have to do to get it to pass is run a tube from the exhaust into where the pcv goes on the intake and itmake it pass
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