What is one of the components considered part of the Exhaust Emissions System?

The thermostatic air cleaner is a key component of the exhaust emissions system because it helps regulate the temperature of the air entering the engine. By maintaining an optimal air temperature, the thermostatic air cleaner improves the efficiency of combustion, ultimately reducing the amount of harmful emissions produced during operation. It plays a role in ensuring that the vehicle runs as cleanly as possible, which is essential for meeting environmental standards for exhaust emissions.

In contrast, the fuel pump primarily delivers fuel to the engine; the ignition coil is responsible for transforming the battery's low voltage to the higher voltage needed to ignite the fuel-air mixture; and transmission fluid is involved in the operation of the vehicle's transmission system but does not impact the emissions system directly. Each of these other options serves distinct functions within the vehicle's mechanics but does not contribute to regulating or controlling exhaust emissions in the way that the thermostatic air cleaner does.