Which of the following systems is tested by OBD II continuous monitors?

The OBD II (On-Board Diagnostics II) continuous monitors are designed to assess various aspects of a vehicle’s emissions control systems in real-time as the vehicle operates. The first option highlights critical systems such as fuel system performance, misfire detection, and comprehensive component monitoring, all of which are fundamental to ensuring that the vehicle remains compliant with emissions standards.

Fuel system performance refers to the effectiveness of fuel injection and combustion, which significantly affects emissions. Misfire detection identifies if the engine is misfiring, which can lead to increased exhaust emissions. Comprehensive component monitoring involves a wide range of sensors and components that ensure they are functioning within specified parameters, thereby preventing excess emissions.

The other options, while they do mention important emission-related systems, do not encompass the full range of continuous monitoring associated with OBD II. The second option focuses more narrowly on two specific components—exhaust gas recirculation and oxygen sensors—that, although important, do not represent the broader scope of continuous monitoring. The third option includes transmission performance and the catalytic converter, which are not continuously tested during regular operation but may instead be evaluated during specific drive cycles or under certain conditions. The last option addresses systems unrelated to emissions testing in the context of OBD II, as brake system