To determine whether the air filter needs to be replaced, the following aspects can be considered

1、 According to the Appearance Inspection of Air Filter 

Check color: Observe whether the color of the air filter has changed. If the surface color of the air filter noticeably darkens or turns black, it may be due to the accumulation of a large amount of dust and impurities, and replacement needs to be considered.

Check for damage: Check the filter for any damage, perforation, or separation of the air filter paper from the end cap. If these problems are found, the air filter should be replaced immediately to prevent dust and impurities from directly entering the engine.

2、 Based on the Usage Time or Mileage of the Air Filter 

Refer to the manufacturer's recommendation: Understand the normal replacement cycle of the air filter according to the vehicle manufacturer's recommendation or the regulations in the user manual. In general, the air filter needs to be replaced every certain mileage (such as 15000 kilometers) or based on time (such as one year). However, please note that this is only a rough reference range, and the specific replacement cycle needs to be determined based on the actual usage and environmental conditions of the vehicle.

Intelligent reminder: Some smart car models will be equipped with an air filter  replacement reminder function. When the filter needs to be replaced, the vehicle will remind through the indicator lights or display screen on the dashboard.

3、 According to the Performance Test of Air Filter

Purification efficiency test: Although it may be difficult for ordinary car owners to directly test the purification efficiency of the air filter, it can be indirectly judged by observing changes in the vehicle's performance. If the vehicle experiences weak acceleration, increased fuel consumption, or engine malfunction lights, it may be due to a clogged air filter causing poor air intake. At this point, it is necessary to consider checking and replacing the air filter.

4、 According to the Usage Environment of Air Filter  

Harsh environment: If the vehicle frequently travels in harsh environments such as sandstorms and construction sites, there will be more dust and impurities in the air, and the burden on the air filter will also be heavier. Therefore, vehicles operating in these environments should shorten the replacement cycle of the air filter.

In summary, determining whether the air filter needs to be replaced requires comprehensive consideration of multiple aspects such as appearance inspection, usage time or mileage, performance testing, and usage environment. In order to maintain the performance of the engine and extend its service life, it is recommended that car owners regularly replace the air filter according to the vehicle manufacturer's recommendations or the provisions in the user manual. At the same time, when replacing the filter, choose a legitimate product that matches the prototype number and follow the correct installation steps.

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