The Importance of a NOx Sensor in Your Truck

If you’re driving a diesel truck, one of the most important components of your vehicle is its NOx sensor, or catalytic converter monitor as it’s also known. A truck’s NOx sensor monitors the amount of nitrous oxide in the exhaust gasses coming out of your tailpipe. While nitrous oxide emissions are not harmful to humans at low levels, they become increasingly more dangerous as your level of emissions increases – so it’s important to know how to maintain and replace your NOx sensor if it becomes faulty or broken.

NOx Sensors For Trucks, Buses & Coaches

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Defining a NOx sensor

The term NOx stands for nitrogen oxide, which is what we’re referring to when we say oxides of nitrogen. In automotive terms, oxides of nitrogen are generally referred to as an oxidizing agent, so that’s how we’ll refer to them from here on out. A few common oxidizing agents include: Nitric oxide (NO) – from combustion and/or diesel engines; Nitrous oxide (N2O) – typically produced in combustion engines during internal combustion; and Nitrogen dioxide (NO2) – formed when oxygen combines with any oxidizing agent. However, because oxides of nitrogen are produced during most forms of combustion, you’ll find them present in nearly all exhaust systems—from car engines to jet turbines.

How does the NOx sensor effect emissions?

A sensor called a NOX analyzer, or oximeter, measures exhaust gases to determine levels of oxides of nitrogen (NOx). As their name suggests, NOX compounds are highly reactive and can harm both humans and vehicles. Their presence is tied directly to combustion engine emissions. When automobiles burn fuel in their engines they do so under controlled conditions; air and fuel are kept at optimal ratios for efficient operation.

What happens when the emissions aren’t controlled?

A truck with faulty or broken emissions-control equipment could be emitting huge amounts of pollution into its surroundings. According to World Health Organization (WHO), air pollution is responsible for seven million deaths per year around the world—that’s more than HIV/AIDS, tuberculosis, and malaria combined. That doesn’t even account for particle pollution. Unchecked emissions can lead to health issues such as asthma, lung cancer, respiratory infections, and cardiac disease.

Why does it matter?

Because you don’t want to be exposed to dangerous levels of nitrogen oxide. Every year, thousands of people die from air pollution-related diseases—nearly all those deaths occur in cities. The good news is that many communities are taking action to improve air quality. In many cities, nitrogen oxides (NOx) and other pollutants like ozone, particulate matter and carbon monoxide are illegal at some times because they pose an immediate health risk. The bad news is that when cars pollute more than allowed, more expensive inspection fees kick in; if you ignore those fees for too long, your registration can be suspended.

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