How to replace pcv valve

In order to look up the correct procedure we'll need more information, Lonnie. First of all, what year and engine size is your Highlander? The position of the PCV valve will vary depending on your answer, so if you want us to point you to the exact location you'll need to give us that.

That being said, I can point you in the right direction. Start off here on the Toyota page of the online LEMON manuals site.

Free Service Manuals for Toyota vehicles ~ LEMON Manuals

Now select the correct year for your Highlander; for the sake of illustration I'm randomly picking a 2015 model year.

Free Service Manuals for 2015 Toyota vehicles ~ LEMON Manuals

Next we click on the Highlander folder and see that there are quite a few choices to pick from here. Again, since I don't know the specifics of your rig, I've randomly selected the LE, 3.5L Eng VIN K, FWD option.

Free Service Manual for the 2015 Toyota Highlander LE, 3.5L Eng VIN K, FWD ~ LEMON Manuals

Click on the Repair and Diagnosis link next.

Repair and Diagnosis — 2015 Toyota Highlander LE, 3.5L Eng VIN K, FWD Service Manual ~ LEMON Manuals

Scroll down and open the Engine Mechanical folder, and under that you'll find the Auxiliary Emission Control Systems folder; open that one up too. Now select the Emission Control System (2GR-FE) (Service Information) (Except Hybrid) link, taking you here.

Emission Control System (2GR-FE) (Service Information) (Except Hybrid) — 2015 Toyota Highlander LE, 3.5L Eng VIN K, FWD Service Manual ~ LEMON Manuals

The last folder on that page says PCV Valve; click on that and you'll see all the information you need to replace your PCV valve.

• Components [12/2013 - 11/2016]
• Removal [12/2013 - 11/2016]
• Inspection [12/2013 - 11/2016]
• Installation [12/2013 - 11/2016]