Which set of components is listed as part of the Other Emission Related Components/Systems category for visual inspection?

• A. Thermal Reactors; Timing Gears and Pulleys; Ozone Reducing Radiators
• B. Oxygen Sensor; Catalytic Converter; Exhaust Manifold
• C. Ignition Coil; Piston; Crankshaft
• D. Fuel Injectors; Oxygen Sensor; Throttle Body

Answer: (A)

The main idea is that this category covers devices that influence emissions but aren’t the standard core emission-control parts. Thermal reactors are devices placed in the exhaust to burn off extra hydrocarbons, an older method of reducing emissions. Timing gears and pulleys affect engine timing, which changes combustion and thus emissions. Ozone reducing radiators are additional, less common equipment aimed at limiting ozone-related concerns. Together, these illustrate the kind of auxiliary or older emission-related components that the visual inspection category is designed to note.

In contrast, items like oxygen sensors, catalytic converters, and exhaust manifolds are central emission-control components, not the “other” category. Engine parts such as ignition coils, pistons, and crankshafts aren’t primarily emission-related, and fuel injectors, oxygen sensor, and throttle body blend air and fuel rather than representing the miscellaneous emission-related group. So the set that includes Thermal Reactors, Timing Gears and Pulleys, and Ozone Reducing Radiators is the correct one.