The 2004 Nissan Xterra PCV valve is located on the outside of the air cleaner housing. The PCV valve can be found on the back of the air cleaner housing.
where is the PCV valve located on a 2004 chevy tahoe
Where's the PCV valve located on a 2004 Toyota Sienna van
The PCV valve on a 2004 Volvo S40 is located on the engine crankcase. It is a small rubber valve.
Here's a photo: http://xterra101.comimagespcv.jpg
In the valve cover.
The pcv valve is located on the rear of the oil filler housing.
The PCV Valve is located in the Vaccum line above the alternator.
You did not say what size engine but in most cases the PCV valve is in the valve cover.
The PCV valve on the 2004 Kia Sorrento is on the drivers side rear of the engine. It is just under the ICV.
under the hood
There isn't one.
The PCV valve is located on the drivers side of the engine directly below where the N in Nissan is on top of the motor. There will be a short hose on the end of it with a clamp keeping it in position