Which of the following components is NOT part of an exhaust inspection?

The fuel injector is not part of an exhaust inspection as it is primarily associated with delivering fuel to the engine for combustion, rather than dealing with emissions or exhaust gases. During an exhaust inspection, the focus is typically on components that are integral to managing and measuring the exhaust produced by the combustion process.

The catalytic converter is essential for reducing harmful emissions, as it converts pollutants in the exhaust gases into less harmful substances. The oxygen sensor plays a crucial role as well, as it measures the level of oxygen in the exhaust gases which helps the engine control system optimize the air-fuel mixture for efficient combustion and reduced emissions. The muffler is also included in exhaust inspections, as it is responsible for reducing noise emanating from the exhaust system and can also impact emissions performance.

Thus, while the catalytic converter, oxygen sensor, and muffler are directly linked to the exhaust system and play significant roles during an inspection, the fuel injector is not relevant in this context.