How to tell if your car’s air filter needs to be replaced

Should you replace your cabin or engine air filter? 

Your vehicle’s air filter plays a crucial role in maintaining engine performance and air quality inside the cabin. Over time, air filters become clogged with dirt and debris, reducing their effectiveness and potentially impacting your car’s efficiency. If you’re unsure if you should replace your cabin or engine air filter, Mercedes-Benz of Arrowhead in Peoria, AZ, is here to help. Below, we’ll cover how long air filters typically last and how to tell if your car’s air filter needs to be replaced with an air filter visual check or warning signs. 

How Long Do Air Filters Last? 

The lifespan of an air filter varies depending on driving conditions and vehicle type. Generally, most manufacturers recommend replacing the engine air filter every 12,000 to 15,000 miles and the cabin air filter every 15,000 to 30,000 miles. However, if you frequently drive in dusty or polluted areas, your air filter may need replacement sooner. Checking your owner’s manual for specific recommendations is always a good idea. 

How to Visually Check Your Air Filter 

A quick and simple way to determine if your air filter needs replacing is by inspecting it yourself: 

1. Locate the filter: The engine air filter is usually inside a plastic housing under the hood, while the cabin air filter is typically behind the glovebox or under the dashboard. 
2. Examine the filter’s condition: A clean air filter should be white or light gray. If it appears dark, clogged, or covered in debris, it’s time for a replacement. 
3. Check for excessive dirt buildup: If the filter is visibly dirty or has an unpleasant odor, it’s not filtering air properly and should be changed. 

Warning Signs Your Air Filter Needs Replacing 

Even if you haven’t checked the filter visually, your car may show signs that it’s time for a new one. Be on the lookout for: 

• Reduced Airflow from Vents: A clogged cabin air filter can weaken airflow, making it harder to cool or heat the interior. 
• Unusual Odors: A musty or moldy smell inside the cabin may indicate a dirty cabin air filter. 
• Decreased Fuel Efficiency: A clogged engine air filter can reduce air intake, leading to lower gas mileage. 
• Check Engine Light: In some cases, a severely dirty air filter can trigger the check engine light, signaling airflow issues.