If the air filter element is too dusty, it will cause the following hazards to the performance of the engine and the vehicle:

Engine performance degradation:
Too much dust will hinder air circulation, resulting in a reduction in the amount of air inhaled by the engine, which in turn reduces combustion efficiency and reduces engine power.
Increase fuel consumption:
Due to reduced air flow, the engine may not be able to burn fuel adequately, resulting in reduced fuel efficiency and increased fuel consumption.
Engine wear increases:
The air filter element cannot effectively filter dust, which will lead to more impurities entering the engine, accelerating the wear of the cylinder, piston, piston ring, valve and other components.
Engine failure:
Long-term inhalation of unfiltered dust may form carbon deposits inside the engine, affecting the normal operation of the engine, and may even lead to engine failure.
Shorten spark plug life:
Dust entering the combustion chamber may contaminate the spark plug, causing the spark plug to accumulate carbon, affecting the ignition efficiency and shortening the service life of the spark plug.
Increased emission of pollutants:
Inadequate combustion will produce more pollutants, such as carbon monoxide, hydrocarbons, etc., increasing the pollution level of exhaust emissions.
Affect the air conditioning system:
If the air filter element is too dirty, it may affect the air quality of the air conditioning system in the car and reduce the cleanliness of the air in the car.
Therefore, regular inspection and replacement of air filter is a very important work in car maintenance, which can avoid the occurrence of the above problems and ensure the normal operation of the engine and the performance of the vehicle.