The PCV Valve on the 2.5 liter 5 cylinder engine is built into the valve cover assembly. The complete valve cover should be replace if your PCV diaphragm tears. Below we have listed a group of possible symptoms to help you determine if this could be the problem with your vehicle.
The tearing of the 2.5 PCV valve may cause the following symptoms
• Rough or erratic Idle
• Fault Code P2279 - Intake Air Leak Detected
• Fault Code P0507 - Idle Speed Faster than Normal
• You can verify that this is your issue by attempting to remove the oil cap while the engine is running. If you cannot or it is very difficult this is likely to be your issue. This happens because when the diaphram for the PCV valve inside the valve cover tears, it allows intake manifold vacuum inside the valve cover causing suction on the oil cap.
DIY on how to replace the 2.5 Valve Cover 07K103469L