Which part of a vehicle's exhaust system is commonly inspected for leaks?

The catalytic converter is an essential component of a vehicle's exhaust system, responsible for reducing harmful emissions before they are released into the atmosphere. During a smog check, it is crucial to inspect the condition of the catalytic converter, as leaks in this area can lead to increased emissions of pollutants, such as hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx). A functioning catalytic converter should effectively capture and convert these gases, and any leaks may compromise its performance.

While other parts of the exhaust system, such as the exhaust manifold, muffler, and tailpipe, are also subject to inspection, the catalytic converter is particularly critical in the context of emissions testing and compliance with environmental standards. Issues with the catalytic converter can directly affect the vehicle's emissions output, making it a primary focus during inspections for leaks and overall functionality.