Nitrogen dioxide is just one of a group of reactive gasses referred to as “oxides of nitrogen,” or “nitrogen oxides (NOx).” These gases contribute to the formation of ground level ozone and small particle pollution. By adjusting and monitoring air/fuel mixtures, a modern computer and oxygen sensors can keep HC, CO, and CO2 under control. When the EPA first addressed air pollution, they directed their attention to the amount of unburned hydrocarbons (HC), carbon monoxide (CO), carbon dioxide (CO2), and oxides of nitrogen (NOx). But in order to understand why, I first have to cover, “What is an EGR valve.” What does an EGR valve do? Doing an EGR delete is a really bad idea. I often see car owners ask how to perform an EGR delete. ![]() Repair Topics > Emissions System > What is an EGR valve? What is an EGR valve? What does an EGR valve do and can I delete my EGR?
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