What is the main function of the cabin air filter?

The main function of the cabin air filter is to clean the air entering the vehicle, which is crucial for maintaining a healthy and comfortable environment for the occupants. The cabin air filter is designed to trap dust, pollen, pollutants, and other airborne particles that can enter through the vehicle's ventilation system. By doing so, it helps ensure that the air inside the cabin remains clean and free from harmful substances.

Maintaining a properly functioning cabin air filter is important for optimal HVAC (heating, ventilation, and air conditioning) system performance. A clean filter allows for better airflow and can improve the efficiency of the vehicle's heating and air conditioning systems, promoting passenger comfort.

In contrast, the other options reflect functions unrelated to the cabin air filter. Cooling the engine pertains to the engine cooling system, filtering oil relates to the oil filter, and assisting in fuel combustion is a function of components within the engine, such as fuel injectors and the combustion chamber. These distinctions highlight the specific purpose of the cabin air filter in relation to vehicle air quality.