Air Filter Replacement

The air filter is a crucial part of your vehicle’s fuel system. The air filter provides clean air to a vehicle’s fuel injection system, and, if it becomes clogged or dirty, it can cause your car to idle or run roughly and reduce gas mileage. The PCV valve helps prevent the release of gas fumes from the engine. If it becomes blocked or clogged, it can cause oil leaks and promote the formation of sludge in the engine.

  • Difficulty: Easy
  • Duration: 5-10 minutes
  • How often: every 20000 km

You should check your air filter every six months and replace it according to the vehicle manufacturer’s recommendations. If you’re unsure, replace the filter every 12 months or 20,000 kilometers, or sooner if the vehicle is operated in extremely dusty conditions. Replace the filter when it appears dirty or clogged. Check the PCV valve and any related hoses whenever you check or replace the air filter. It’s also a good idea to check the spark plugs and their wires as a maintenance routine.




Proper maintenance and service procedures are vital to the safe, efficient operation of all motor vehicles, as well as to the safety of the person performing the work—you.

Whenever you are working on your vehicle, we recommend that you follow these important safety rules:

  • Do have a first-aid kit handy.
  • Do be careful when working around hot or sharp objects.
  • Do follow the manufacturer’s instructions for all products.
  • Do use safety stands under the frame or drive-on ramps if you must raise your vehicle.
  • Don’t run the engine without proper ventilation.


Read these instructions completely before you begin:

These instructions will help you replace air filters on most common cars. Should your car have a different design, please check the owner’s manual of your vehicle.

Removing the Old Air Filter

  • Raise the hood and find the air cleaner assembly. It’s the round can located on top of the carburetor for old cars and can be different shapes on more recent cars or trucks.
  • Remove the wing nut on top of the can, or remove the retaining clips or screws around the edge of the air filter box.
  • Lift off the air filter cover and set it aside. You probably won’t have to disconnect any hoses, but, if you do, make sure to label and reattach them in their original positions. If necessary, make a drawing to help you.
  • Remove the old air filter element and dispose of it properly.

Installing the New Air Filter

  • Drop the new filter into place in the air filter box.
  • Replace the lid and finger-tighten the wing nut or the screws. Otherwise, snap the retaining clips around the edge of the can back into place.
  • Make sure any hoses you remove are replaced in their original positions and that the air box is sealed properly.

Checking and replacing the PCV Valve


  • The PCV valve is usually located at the end of a hose running from the air cleaner to the engine valve cover. Likely locations of the valve (Diagram 5) are in the valve cover (1-2), at the carburetor (3) or in the intake manifold (4). Diesel engines do not have a PCV valve.
  • Pull the valve from the grommet. (Diagram 6)
  • A PCV valve that is functioning properly will usually rattle when shaken.
  • If the valve is held in place with a hose clamp, squeeze the hose clamp apart with pliers. Remove the valve from the end of the hose. (Diagram 7)
  • Check to be sure that the hose is not clogged or brittled. If it is, it should be replaced.
  • Insert a new PCV valve into the end of the hose. (Diagram 8).
  • Reinstall the hose clamp (if present).
  • Push the PCV valve back into the grommet. Be sure the other end of the hose is properly connected.

Quick tips

  • Follow these instructions carefully. Read and be sure you understand them before you begin.
  • Gather all your tools and supplies before you begin.
  • Allow plenty of time to do the job so you don't have to hurry.
  • Remember that these are general instructions. For more detailed instructions pertaining to your specific vehicle, consult an appropriate repair manual.
  • Safety is important whenever you're working around machinery. Beware of hot objects, sharp instruments and hazardous materials.
  • Don't substitute tools unless you are sure you won't compromise either your safety or the performance of your vehicle.
  • If you have any questions about repair and maintenance, contact your local NAPA Auto Parts store.
  • Find the nearest NAPA Auto Parts location.

2 Replies to “Air Filter Replacement”

  1. Click Here says:

    Nice post. I was checking constantly this blog and I am impressed! Very useful info specifically the last part 🙂 I care for such info a lot. I was looking for this particular info for a long time. Thank you and good luck.

  2. Kashan says:

    Very helpful blog it is, in the second paragraph you mentioned the (You should check your air filter every six months and replace it according to the vehicle manufacturer’s recommendations) and you also make it amazing and an easy read the blog for the reader by adding subtitles. it really helped me a lot in the field of HAVAC services.

Leave a comment

Your email address will not be published.Required fields are marked *