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.

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Why is there a bulge in the exhaust pipe of my dirt bike?

I have a dirt bike and the exhaust pipe has this big bulge in it near the engine. What is the bulge for?


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 »