Like HowStuffWorks on Facebook!

Auto | Under the Hood | Exhaust & Emissions

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

Featured
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?


How does the oxygen sensor in a car work?

 How does the oxygen sensor in a car work?

How does the oxygen sensor in a car work? See more »

 What is a catalytic converter and how does it work?

What is a catalytic converter and how does it work? See more »