What emissions system components are highlighted during the inspection?

During a Pennsylvania Enhanced Vehicle Safety Inspection, the emissions system components that are specifically emphasized include catalytic converters and oxygen sensors. The catalytic converter is critical for reducing harmful emissions from the vehicle's exhaust by converting toxic gases into less harmful substances. It plays a pivotal role in meeting federal and state emissions regulations.

Oxygen sensors monitor the level of oxygen in the exhaust gases, providing necessary feedback to the engine control unit. This feedback helps optimize the air-fuel mixture for combustion, ensuring that the engine operates efficiently and minimizes pollutant emissions. Proper functioning of these components is crucial for reducing the vehicle's environmental impact and ensuring compliance with emissions standards, making their inspection essential during the safety check.

The other options, although important for vehicle operation, do not directly relate to emissions control or monitoring as catalytic converters and oxygen sensors do. Therefore, highlighting these components reflects a focus on maintaining the vehicle's emissions system and supporting environmental regulations.