How to Check and Replace Engine Air Filters: A Step-by-Step Guide

Over time, dirt can clog up the filter, reducing airflow and making the engine work harder – which isn't great for fuel efficiency or long-term engine health.

What to Expect

• Time Needed: 10-15 minutes
• Difficulty: Easy
• Average Cost: $35

Source: 2025 Fleet Benchmark Report

What You’ll Need

    New engine air filter (check your owner’s manual for the right type)
    Screwdriver or socket wrench (for some models)
    Shop rag or gloves (to keep hands clean)

How to Check and Replace Engine Air Filters

Step 1: Locate the Air Filter Housing

• Pop the hood and look for a black plastic box, usually near the top or side of the engine.
• If you're not sure where to look, check the owner's manual or search for your vehicle online.

Step 2: Remove the Air Filter

• Unclip or unscrew the housing cover to access the filter.
• Carefully remove the old filter and check for dirt, debris or discoloration.

Step 3: Inspect the Filter Condition

• Still looks clean? Give it a light tap to shake out dust and put it back in.
• Looks dark, clogged or full of debris? It's time for a replacement.

Step 4: Install the New Air Filter

• Place the new filter in the housing, making sure it's facing the same direction as the old one.
• Reattach the housing cover securely.

Step 5: Close the Hood & Test the Engine

• Start the engine and let it run for a minute to ensure everything sounds normal.
• If you hear anything off, double-check that the filter is seated properly.

Avoid These Common Mistakes

• Installing the wrong air filter. Using the incorrect filter size or type can reduce airflow and impact engine performance. Always check your owner’s manual or match the old filter before replacing.
• Forgetting to seat the filter properly. If the new filter isn’t fully secured in the housing, unfiltered air can bypass it, allowing dirt and debris to enter the engine. Ensure a snug fit before closing the cover.
• Skipping regular checks. A clogged air filter reduces fuel efficiency and power over time. Check it every 12,000 to 15,000 miles or more often if driving in dusty conditions.

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FAQs

How do I know if my engine air filter needs replacing?

A dirty air filter impacts fuel efficiency and engine performance. If you notice sluggish acceleration, lower gas mileage, or a visibly clogged filter, it's time for a replacement. Most filters should be checked at least once a year.

How do I know which air filter to buy?

You can check your owner’s manual or the existing filter for the correct size and type. You can also look it up using your vehicle’s make, model and year at an auto parts store or online.

Can I clean and reuse my current filter?

Standard paper air filters must be replaced, however reusable performance filters can be washed and re-oiled by following the manufacturer's instructions. Always check your filter type before cleaning or replacing.

Why does this matter for my car (or my fleet)?

A clean air filter helps your engine run efficiently by ensuring proper airflow. This improves fuel economy, reduces engine strain, and extends the life of key components. For fleets, keeping filters clean means lower fuel costs and fewer unexpected breakdowns.

How often should I check or replace my engine air filter?

Most vehicles need a new air filter every 12,000–15,000 miles, but this varies. Fleets operating in dusty or high-mileage conditions should be checked more frequently. If the filter looks dark or clogged, it's best to replace it.

How much does a new engine air filter cost?

Depending on the vehicle, a DIY air filter replacement costs $10–$40. If you go to a shop, expect to pay $50–$100 for parts and labor. Checking it yourself first can save time and money.

Can I replace an engine air filter myself?

Yes! Replacing an air filter is one of the most straightforward maintenance tasks. It usually requires no tools and takes less than 10 minutes. Just locate the filter housing, swap in the new filter and you're done!