Follow this guide to quickly and easily change the PCV valve on your 2002-2003 Lexus ES300.

Why do you need to change the PCV valve?

Before diving into the instructions for changing the PCV (Positive Crankcase Ventilation) valve, it’s important to understand why this should be done.

The PCV valve is a crucial component of your vehicle’s emissions control system. It regulates the amount of crankcase vapors that are recirculated back into the engine’s intake manifold to be burned.

Over time, the PCV valve can become clogged with debris, causing it to malfunction. This can result in poor engine performance, decreased fuel economy, and increased emissions.

Another common symptom of a bad PCV valve is if your car has started consuming oil. If you have to top off your oil between oil changes, a quick fix is often changing out the PCV valve.

For these reasons, it’s recommended that you change your PCV valve at regular intervals to ensure that your vehicle is running efficiently and emitting fewer pollutants.

How Often should you change your PCV valve?

The recommended interval for replacing the PCV valve in a 2002-2003 Lexus ES300 varies depending on driving conditions, but generally, it’s recommended to replace it valve every 30,000 to 60,000 miles (48,280 to 96,560 kilometers) or at least every three years, whichever comes first.

However, if you frequently drive in dusty or dirty environments, or if you frequently make short trips or drive in stop-and-go traffic, you may need to replace the PCV valve more frequently.

Now, let’s move on to the step-by-step instructions:

Materials Needed:

tools for changing pcv valve

Step 1: Locate the PCV valve. On the 2002-2003 Lexus ES300, the PCV valve is located on the valve cover, near the firewall. It’s a small, cylindrical component with a hose connected to it.

pcv valve location on a 2002 lexus es300

Step 2: Remove the hose from the PCV valve. The hose should be attached to the valve with either a clamp or a press-fit connection. Use pliers or your hands to loosen the clamp and slide it upward. Be careful not to damage the hose in the process.

remove hose clamp from PCV valve
remove hose from PCV valve

Step 3: Remove the PCV valve from the valve cover. Use a 19mm (or 3/4″) wrench or deep-well socket with stubby handle to remove the PCV valve. There is limited space, so a short wrench would work best.

use a 19mm wrench to remove the PCV valve

Step 4: Inspect the old PCV valve. Look for signs of clogging. Shake it back and forth, you should hear something rattling in there if it’s working properly. Even if you do hear rattling, it’s still a good idea to replace it.

the old PCV valve removed
the new and old PCV vavles side by side

Step 5: Install the new PCV valve. Torque the new PCV valve to 14 lb-ft. If you don’t have a torque wrench, just make sure it is snug. The PCV valve I recommend comes with thread tape on it for a good seal. Also, the threads are tapered, so no need to overdo it on tightening.

put in the new PCV valve
tighten the new PCV vavle in the Lexus ES300 using a 19mm wrench

Step 6: Reconnect the hose to the PCV valve. If the hose has a clamp, use pliers or your fingers to slide the clamp around the hose and the valve.

reinstall the PCV valve hose
reinstall the pcv valve hose clamp

Step 7: Test the new PCV valve. Start the engine and listen for any unusual noises or vibrations. Check for leaks around the PCV valve and hose connection. If everything looks and sounds normal, you have successfully replaced the PCV valve.


Replacing the PCV valve in your 2002-2003 Lexus ES300 is a simple task that can be completed in a few minutes. It’s an important part of your vehicle’s emissions control system and should be replaced at regular intervals to ensure that your vehicle is running efficiently, emitting fewer pollutants, and not eating oil.

Materials Used: