8 Steps for PCV Valve Replacement

PCV valve replacement is a very easy task. The PCV valve is a tiny piece of plumbing that is made of plastic and has a rubber hose connected to one of its openings. Once you have located your PCV valve in your car engine, valve replacement should not be a problem.

Crankcase gasses are produced during fuel combustion, the process that powers your automobile’s engine. Some of those gasses go to your crankcase where your engine oil is. Your PCV (Positive Crankcase Ventilation) valve is important, because it routes crankcase gasses back into your car’s air intake system. From there, they can be burned again by the engine. If expelled out of the crankcase, it can turn oil into sludge. Sludge will clog your engine. Also, the pressure build up produced by those gasses can cause your gaskets and seals to blow out.

Tools and Materials Needed

  • New PCV valve
  • Slip joint pliers

Step 1 – Check your Existing PCV Valve

It is important to know when to replace your existing PCV valve. If your automobile shows signs of PCV valve failure such as engine clogging and malfunction, you might need a PCV valve replacement already.

One way to find out if your PCV valve is still in good condition is by shaking it. If it produces noise, there is a good chance that it is still working properly.

Step 2 - Take your Car to the Shop

If you are not sure however, you can take your car to a repair shop. Ask your car engine technician to check it. If it needs replacement, get a new one.

Step 3 – Buy a New PCV Valve

Once you know that you need a PCV valve replacement, buy a new PCV valve or a PCV valve tool kit, which also contains a new hose with it. If you need both valve and hose replacement, you can either get a kit or buy the valve and hose separately. Both will cost you approximately $12.

Step 4 – Remove the Hose

Locate your PCV valve. It is usually at the upper part of your engine. It has a rubber hose attached to it. Detach this from the valve.

Step 5 – Remove the PCV Valve

After you have removed the hose from the valve, you can then remove the valve itself. If the valve doesn't come off easily, you can wiggle it back and forth a bit. You may also use slip joint pliers to pry it out.

Step 6 – Replace the Valve

Get your new PCV valve and attach it to where the old valve was. Again, if you find this difficult to do, try using pliers. Make sure it is properly secured.

Step 7 – Cut the Hose

If you are replacing the hose, make sure that the new one is the same length as the old one. If not, cut it accordingly.

Step 8 – Attach the Hose

Easily attach the hose to the PCV valve replacement. Then, attach the other end of the hose to where the old one used to be connected to. Make sure it is properly secured.


  • For PCV valves that are extremely difficult to remove, use a little motor oil to lubricate the process.
  • Do not wait for your engine to show signs of PCV valve malfunction before having it replaced.
  • Take note of how long it takes for your PCV valve to wear out, so you can have an idea how often you need a PCV valve replacement.