PCV Valve

The Subaru PCV Valve, part number 11810AA040, is a crucial component for maintaining the health of your vehicle's Positive Crankcase Ventilation (PCV) system. A malfunctioning PCV system can lead to several noticeable issues, including blue smoke from the tailpipe and inconsistent or excessively high engine idle speeds. These symptoms indicate that the PCV valve, or its associated plumbing, may be in need of service or replacement. Further signs of a failing PCV system can include the engine oil dipstick becoming dislodged from its tube or an audible hissing sound from the oil filler cap while the engine is running. This PCV valve is designed as a direct replacement for a wide range of Subaru models, ensuring proper fitment and function. It is engineered to work with 4-cylinder H4 engines, including 2.5L and 2.0L variants, across many model years. Specifically, this part is compatible with the Baja, Forester, Impreza, Legacy, Outback, STI, and WRX models, covering a broad spectrum of Subaru vehicles from 1985 to the present.