Does a Subaru Forester have a PCV valve?
Yes. The Forester uses a PCV (Positive Crankcase Ventilation) system, and every model year includes a PCV valve or an equivalent check valve as part of its crankcase ventilation. The exact layout varies by engine family and generation.
What a PCV valve does
The PCV valve regulates the flow of blow-by gases from the crankcase back into the intake to be burned in the engine. This helps reduce emissions, prevents pressure buildup, and keeps the engine running smoothly. A failing PCV valve can lead to rough idle, oil leaks, increased oil consumption, or check engine codes.
Where the PCV valve sits in a Forester
The location and design of the PCV valve in a Subaru Forester depend on the engine generation. In most Foresters, the PCV valve is mounted on or near the valve cover and connected to the intake manifold via hoses. Some engines use a small inline check valve as part of the PCV circuit. Exact placement can differ between EJ-era engines found in older models and the newer FB/FA family used in recent years.
EJ-series engines (older Foresters)
In earlier Foresters powered by the EJ engine family, the PCV valve is typically located on the valve cover and connects to the intake manifold through a hose. The setup often includes a simple check valve in the hose to regulate flow. Regular inspection is advised because a clogged or cracked valve can cause oil leaks or idle issues.
FB/FA-series engines (modern Foresters)
In newer Foresters with the FB/FA engine family, the PCV valve remains on the valve cover and links to the intake system via hoses, sometimes with an inline check valve. The modern layout emphasizes a compact PCV assembly integrated with the crankcase breather system. As with older engines, symptoms of a faulty PCV valve include rough idle, oil odor, or increased oil consumption.
How to check or replace the PCV valve
If you’re troubleshooting, here is a typical approach to inspecting and, if needed, replacing the PCV valve on a Forester.
- Ensure the engine is cool before you start any work.
- Open the hood and locate the PCV valve on the valve cover, along with the connected hoses to the intake manifold.
- Detach the hose from the valve and remove the PCV valve from its grommet or mounting point.
- Inspect the valve for cracks, clogging, or a stuck mechanism. Shake it gently; a functioning PCV valve usually rattles.
- If the valve is clogged or doesn’t rattle, replace it with an OEM or equivalent part. Also inspect hoses for cracks or oil residue.
- Reinstall the new valve, reconnect hoses, and ensure clamps are secure.
- Start the engine and check for proper idle and any vacuum leaks around the valve cover area.
Regularly inspecting the PCV valve as part of routine maintenance helps prevent engine issues and keeps emissions in check. If you’re unsure about locating or replacing the valve, consult the owner’s manual or a qualified Subaru technician.
Summary
In short, yes—the Subaru Forester uses a PCV valve as part of its crankcase ventilation system. The valve’s exact position and configuration vary by generation (older EJ engines versus the modern FB/FA family), but the core function remains the same: vent crankcase gases back into the intake to reduce emissions and protect the engine. Regular checks and timely replacement when needed keep the system working efficiently.
