Car Exhaust and 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 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.


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.

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?