this isn't the same car but the engines are really similar so i assume it would be in a similar location right under the throttle body facing the driver
http://www.clubwrx.net/forums/showthread.php?t=98574
this link has a step by step pcv replacement for a impreza but again the engines are very similar
-Alex
The 2003 Subaru Outback PCV valve is located on the air cleaner housing. The PCV valve will be on the back of the housing.
The PCV valve is located in the valve cover
the pcv valve is located on top of the valve cover
The PCV valve is located on top of the valve cover in the middle.
The PCV (Positive Crankcase Ventilation) valve on a 2006 Subaru WRX STI is located on the driver’s side of the engine, near the rear of the valve cover. It is typically mounted in a grommet on the valve cover and connected to the intake system via a hose. To access it, you may need to remove some engine covers or components for better visibility.
Pull upward on the hose that the PCV valve is in. The PCV valve will pull out of the hose. The PCV valve is located in the valve cover.
On a 2014 Subaru, the Positive Crankcase Ventilation (PCV) valve is typically located on the engine's valve cover. Specifically, it can be found on the driver's side, near the rear of the engine. To access it, you may need to remove some components or covers, as it can be somewhat tucked away. Always consult the vehicle's service manual for precise instructions and diagrams.
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The pcv valve is on the passenger side valve cover
The PCV valve is located in the rear valve cover,just behind the throttle body