1. Replacing the air filter can be judged based on the time or distance the vehicle has been driven.
Is the air filter in need of replacement? It is best to remove it and check if it is completely blocked and unable to allow air to pass through. The function of an air filter is to filter out impurities in the air, allowing clean air to enter the engine. If the air cannot be filtered, the air filter will have no effect.
2. After working for a period of time, the actual effect of the air filter is much higher than that of a new filter.
This is because impurities adsorbed on the surface of the filter can also filter out small particles. However, if the filter accumulates a large amount of dust, it can significantly reduce the filtering effect of the air filter, thereby affecting the normal operation of the engine. The engine needs to be replaced with a new air filter due to increased fuel consumption, decreased power performance, frequent failure to start, and gradual deterioration of emissions.
3. If the air filter appears to be very dirty, do not rush to replace it. Dirty does not mean that the air filter cannot function properly, and whether replacement is necessary depends on the actual use of the car.