What are the main components of an exhaust emission system?

The correct choice highlights the vital components of an exhaust emission system, which plays a crucial role in controlling and reducing harmful emissions produced by engines.

The catalytic converter is a key component that facilitates the conversion of harmful pollutants in exhaust gases into less harmful substances through chemical reactions. This process is essential for meeting environmental regulations and improving air quality.

The exhaust manifold collects exhaust gases from multiple cylinders and directs them to the catalytic converter. Proper functioning of the manifold is necessary to ensure efficient gas flow, reducing back pressure and optimizing engine performance.

Oxygen sensors monitor the level of oxygen in the exhaust gases. They provide data to the engine control unit, which can adjust the air-fuel mixture for optimal combustion. This not only enhances engine efficiency but also helps minimize emissions.

Mufflers serve a different but equally important function by reducing the noise produced by exhaust gases as they exit the vehicle. While mufflers primarily focus on sound reduction, they also play a part in the exhaust system's overall efficiency.

In contrast, the other choices include components that are not part of the exhaust emission system. For instance, components related to fuel delivery or ignition systems, such as fuel pumps and ignition systems, focus on engine operation rather than emission control. Similarly, parts like the