purge valve

The purge control valve is a dealer only item. Check your Emission Warranted some of these items are covered for a long period of time. I forget where the purge valve is on the Highlander I believe it is on the air filter housing. I have seen the hose that is attached to the Purge Solenoid get knocked of during air filter installation on many Toyota's setting a "Check Engine Light". I have also seen these solenoids test fine electrically but fail intermittently or mechanically failling to seal internally.

Looks like a dealer only item, I checked everywhere.

Dealer repairs usually have some kind of warranty attached. If the problem comes back, they will probably order/replace the valve

Try parts.com They have both for my 2000 Avalon.

Parts.com sells them for 40for a 2002 dodge intrepid