EXHAUST & EMISSIONS

This section can help you keep your exhaust system working properly. Learn how mufflers, catalytic converters and oxygen sensors work.
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How Mufflers Work

Every car out there has a muffler -- it performs the crucial job of turning thousands of explosions per minute into a quiet purr. Mufflers use some cool technology to dim the roar of an engine. Learn the principles that make it work.

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  • Can we make tailpipes that capture CO2?

    Can we make tailpipes that capture CO2?

    It seems like a logical answer to the climate crisis: capture the carbon dioxide that our cars emit. Is it that simple? And what do sand and silica have to do with it? See more »

  • Car Smarts: Catalytic Converters

    Car Smarts: Catalytic Converters

    Catalytic converters are amazingly simple devices that have proven to be highly effective at reducing harmful emissions produced by car engines. How much do you know about catalytic converters? See more »

  • How Catalytic Converters Work

    How Catalytic Converters Work

    A catalytic converter is one of the most important parts of a car's emissions control system. It treats the exhaust before it leaves the car and removes a lot of the pollution. Learn how they work. See more »

  • How Coal Rollers Work

    How Coal Rollers Work

    In a truck pull competition, excessive clouds of diesel smoke are a byproduct of the truck's functionality. But coal rollers have taken this idea from the county fair to the public roads -- all in the name of making people angry. See more »

  • How do I know if my catalytic converter has failed?

    How do I know if my catalytic converter has failed?

    Exhaust emissions test check for the absence of a catalytic converter or a malfunctioning one during an emissions inspection. Read on to learn how you can find out if your catalytic converter has failed. See more »

  • How does the oxygen sensor in a car work?

    How does the oxygen sensor in a car work?

    An oxygen sensor in a car is a very important part of making your engine run smoothly. Learn what it does and what can happen if your oxygen sensor fails. See more »

  • How much air pollution comes from cars?

    How much air pollution comes from cars?

    You see it every time that smoke billows from your car's exhaust pipe, so there's no denying that vehicles are major contributors to air pollution. See more »

  • How Mufflers Work

    How Mufflers Work

    Every car out there has a muffler -- it performs the crucial job of turning thousands of explosions per minute into a quiet purr. Mufflers use some cool technology to dim the roar of an engine. Learn the principles that make it work. See more »

  • What can you do to reduce your car's emissions?

    What can you do to reduce your car's emissions?

    To reduce your cars emissions, you can help its catalytic converter work more efficiently by preheating it, or you can inject a urea solution into your exhaust pipe. Learn what you can do to reduce your car's emissions in this article. See more »

  • What is a catalytic converter and how does it work?

    What is a catalytic converter and how does it work?

    If you have a vehicle that needs to be tested for emissions, you might want to check on the condition of your catalytic converter. So what is it and what does it do? See more »

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