What happens if the air filter is not replaced?

[StAdalynn]

The air filter plays a role in filtering out dust and sand particles from the air, ensuring that sufficient and clean air enters the cylinders. If it is not replaced for a long time, the air filter cannot effectively remove suspended particles from the air, leading to accelerated engine wear and carbon buildup, shortening the engine's lifespan. In severe cases, it may even cause "cylinder scoring." Steps to replace the air filter: 1. Loosen the filter lock and remove the fixing nut. 2. After removing the cover, you can see the air filter. If there is dirt inside or outside the filter housing, wipe it clean with a cloth first. 3. Install a new filter. However, be careful not to touch the paper part of the filter with your hands, especially avoiding contamination by oil. 4. Reassemble the parts in the reverse order of disassembly.

[DiRebecca]

I've been driving for over twenty years and have seen many beginners neglect the replacement of air filters, which can lead to significant issues. A dirty filter blocks the air intake, causing the engine to receive insufficient air, resulting in incomplete combustion, noticeably reduced power, sluggish acceleration, and increased fuel consumption—costing you dozens more on a long trip. More seriously, dust and debris entering the cylinders can scratch the cylinder walls or piston rings, drastically shortening the engine's lifespan over time, with repairs costing thousands or even tens of thousands. The air conditioning system also suffers, with reduced airflow and slower cooling, making summer drives uncomfortably hot and filling the cabin with dust and bacteria, leading to sneezing or allergies. Regularly checking or replacing the filter is simple and cost-effective—typically just a few dozen dollars every year or 10,000 kilometers—so don’t skimp on small savings only to incur big losses.

[McEmmett]

As a budget-conscious office worker, I once tried delaying the replacement of the air filter to save money, only to end up spending more. When the filter became clogged with dust, the engine struggled to intake air, causing fuel consumption to spike by over 10%—costing me hundreds more in gas each month. The clogged vents also reduced AC efficiency, making the car unbearably stuffy in summer. The air blowing out carried a dusty smell, leaving me dizzy after prolonged exposure. Over time, dust infiltrated the engine internals, risking rusted components and shortened lifespan—repairs could cost dozens of times more than a filter. Now, I make sure to replace the air filter every six months. It’s an effortless way to maintain the car’s condition, and the cost is negligible for such high value.

[EmiliaRose]

I love car modifications in my spare time, and not changing the air filter definitely affects performance. A dirty filter restricts air intake, reduces engine combustion efficiency, weakens power, and slows acceleration. Dust sucked into the cylinders may also scratch engine components, increasing carbon buildup and wear. Timely replacement allows the car to breathe smoothly and saves a lot of fuel.

[AnnieFitz]

As a parent, I'm particularly concerned about in-car health, and the consequences of not replacing the air filter can be quite severe. A dirty filter allows dust and bacteria to clog the air ducts, resulting in musty or unpleasant odors from the AC, especially during the rainy season, which can easily trigger respiratory issues—children often cough while riding in the car. With reduced filtration efficiency, particulate matter inside the vehicle increases, potentially worsening allergies over time. It's recommended to inspect and replace the filter every 15,000 kilometers to maintain fresh and safe air inside the car.