You can replace your car's air filter yourself in about 30 minutes with no special tools
A clogged air filter makes your engine work harder, wastes fuel, and costs you money. The good news: replacing it is one of the easiest maintenance tasks you can do yourself. You do not need a mechanic, a lift, or anything beyond a screwdriver. Most air filters cost between $15 and $30, and the job takes less time than an oil change.
The filter sits in a plastic box under your hood called the air intake housing. You pop the box open, slide out the old filter, drop in the new one, and close it back up. The whole process is straightforward enough that you can do it in your driveway while listening to a podcast.
Key Takeaways
- Your car's air filter is located in a plastic box under the hood and can be accessed without tools or a lift.
- Replacing it takes about 30 minutes and costs $15 to $30 for the filter itself, compared to $40 to $75 at a shop.
- You need only the correct filter part number for your vehicle and a screwdriver to open the housing box.
- A new filter improves fuel economy and engine performance, and you should check yours every 12,000 to 15,000 miles.
Find the right filter for your vehicle
Before you open your hood, you need the correct part number. The wrong size will not fit, and a loose filter defeats the purpose. Look up your vehicle's year, make, and model on the website of any auto parts retailer — AutoZone, O'Reilly, NAPA, or Advance Auto Parts all have free lookup tools. You can also check your owner's manual, which lists the filter type in the maintenance section.
Write down the part number and buy the filter before you start. Most retailers stock common filters and can have them ready in an hour. If you order online, the filter usually arrives in two to three days. Buying it first means you will not open your air intake housing and then realize you have the wrong size.
Locate the air intake housing under your hood
Pop your hood and look for a large plastic box, usually black or dark gray, somewhere near the engine. On most cars it sits on top of the engine or to the side. The box is roughly the size of a loaf of bread and has a large hose attached to one side that connects to the engine. This is the air intake housing.
If you cannot find it, check your owner's manual — it will have a diagram of the engine bay with the housing labeled. Once you spot it, you are ready to open it. The housing is held together with clips or bolts, usually three to five of them around the edges.
Open the housing and remove the old filter
Look at how the housing is fastened. Most use plastic clips that you can pop open by hand — just press or pull them outward. Some use bolts that need a screwdriver or socket wrench. Unclip or unbolt all the fasteners and set them aside where you will not lose them.
Lift the top half of the housing off. Inside you will see the old filter, which looks like a pleated white or yellow accordion. Slide it straight out and set it aside. Do not let dirt from the old filter fall into the engine — if the housing is dusty, wipe it out with a dry cloth before you put the new filter in.
Install the new filter and close the housing
Take your new filter out of the box and check that it matches the size and shape of the one you just removed. Slide it into the housing, making sure it sits flat and the pleats are vertical. The filter should fit snugly without forcing it.
Put the top half of the housing back on and fasten all the clips or bolts. Make sure everything is tight — a loose housing can let unfiltered air into the engine. Close your hood and you are done. The whole job should take 20 to 30 minutes the first time you do it.
When to check and replace your air filter
Most manufacturers recommend checking your air filter every 12,000 to 15,000 miles and replacing it every 15,000 to 30,000 miles. If you drive in dusty conditions — unpaved roads, desert, or heavy construction areas — check it more often. A clogged filter looks dark and packed with dust; a clean one is light-colored and you can see through the pleats.
Some cars have two filters: the engine air filter (what you just replaced) and a cabin air filter that cleans the air coming into the passenger compartment. The cabin filter is usually behind the glove box and follows the same replacement process, though it may be harder to reach. Check your manual to see if your car has one and where it is located.
What to do if something goes wrong
If the housing does not come apart easily, do not force it. You may have missed a clip or bolt. Look again carefully, or check your owner's manual for the exact location and fastening method. If the new filter does not fit, double-check that you have the right part number — an incorrect filter is the most common mistake.
If you accidentally drop the new filter or it gets dirty before installation, do not use it. A contaminated filter defeats the purpose and can damage your engine. Buy a replacement and start over. If you are uncomfortable opening the housing or cannot find it, a mechanic can do the job in 15 minutes for $40 to $75, which is still less than many shops charge for an oil change.
Frequently Asked Questions
How do I know if my air filter is dirty?
Open the housing and look at the filter. A clean filter is white, yellow, or light gray with visible pleats. A dirty one is dark, caked with dust, or so clogged you cannot see light through it. If you cannot tell, compare it to a new filter side by side.
Can I clean and reuse my air filter instead of replacing it?
Some filters can be gently tapped or vacuumed to remove loose dust, but this is a temporary fix. Once a filter is clogged, cleaning does not restore it to like-new condition. Replacement is cheaper than the fuel you waste running a dirty filter, so it makes sense to replace it rather than clean it.
What happens if I drive with a clogged air filter?
Your engine has to work harder to pull air through the clogged filter, which reduces fuel economy and engine performance. You may notice slower acceleration or a rough idle. Over time, a very dirty filter can damage the engine, so replacing it before it gets that bad is the smart move.
Do I need to reset anything after I replace the filter?
No. Unlike some maintenance tasks, replacing the air filter does not trigger a warning light or require any computer reset. Just close the housing, close your hood, and drive normally. Your engine will run better when ready.