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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A PCV valve—short for positive crankcase ventilation valve—meters blow-by gases from the crankcase into the engine’s intake system, where they are burned. The system also draws fresh, filtered air into the crankcase. By ventilating the crankcase, it helps control hydrocarbon emissions and reduces the buildup of oil-contaminating vapors.
What does a PCV valve do?
During combustion, some gases can pass the piston rings and enter the crankcase. These are called blow-by gases. The positive crankcase ventilation system routes them into the intake manifold or induction system to be burned with the engine’s normal air-fuel charge. Fresh, filtered air enters the crankcase and mixes with the blow-by gases. Kia describes this flow in its 2026 U.S. owner-manual web help.
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Genuine Honda 17130-RCA-A02 PCV Valve Assembly | $25.99 | Buy on Amazon |
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Genuine Honda 17130-5A2-A01 PCV Valve Assembly | $24.37 | Buy on Amazon |
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Dorman 46835 PCV Valve Assembly | $29.78 | Buy on Amazon |
| 4 |
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Suno Power PCV Control Valve for Legacy Outback 2013-2019 11810AA131 | $13.99 | Buy on Amazon |
The valve regulates how quickly those gases move into the intake as engine vacuum and operating conditions change. In a common spring-loaded design, stronger intake vacuum reduces flow through the valve; when vacuum falls under higher engine load, the valve allows more ventilation. Not every vehicle uses the same PCV arrangement, so the mechanism and component layout vary.
Why is the PCV system important?
Without crankcase ventilation, vapors containing hydrocarbons could escape directly into the atmosphere. The system instead directs them back into the engine to be burned. It also helps prevent gases from lingering in the crankcase: the U.S. Environmental Protection Agency’s 1977 automotive training material identifies oil dilution and sludge formation among the problems associated with that buildup.
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- Genuine OEM part
The same 1977 EPA training text says, “It was found that 20% of all hydrocarbon emissions came from the crankcase.” That is a historical figure, not a current estimate for today’s vehicles. The cited material does not establish a current fleet-wide share of emissions attributable to crankcase gases.
What are signs of a possible PCV problem?
A restricted or failed PCV component can contribute to crankcase pressure, oil leaks, oil consumption, or drivability problems. Possible clues include rough idle, smoke, sludge, and excessive oil use, but none of these proves the valve is at fault. Other problems—including damaged piston rings—can cause similar symptoms, as O’Reilly’s PCV valve guide notes.
Rank #2
- genuine oem factory part
- exact fit
- durable
- best in quality
- this is not an aftermarket part
- Have the system inspected if symptoms persist or worsen.
- Seek a technician’s help when the cause is unclear or symptoms are severe.
- Use the vehicle’s service information to diagnose the system rather than replacing the valve based on a symptom alone.
When should a PCV valve be replaced?
There is no single replacement interval that applies to every vehicle. Maintenance schedules and inspection procedures vary by year, make, model, and engine. Check the owner’s manual and follow the vehicle-specific service procedure; do not apply an interval from another vehicle or a historical training publication.
How do you choose the right replacement?
Use the specified part number or a replacement confirmed to match the vehicle’s exact year, make, model, and engine. Valves that look alike may allow different amounts of airflow, and the wrong hose can collapse and cause a malfunction. Do not choose a valve by appearance or assume one part fits all cars.
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Rank #3
- Direct replacement - this PCV valve is designed to match the fit and function of the original valve on specified vehicles
- Restores functionality - this valve is made to fit and fully restore part functionality after the original valve fails
- Durable construction - this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality - backed by team of product experts in the United States and more than a century of automotive experience
- Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool
For example, GM lists part 12685407 as an OE replacement with specific model-year fitments. That catalog entry is an example, not a universal recommendation; check the listed fitment and warranty terms before purchase. If inspection shows a hose also needs replacement, use the correct hose specification.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you replace a PCV valve yourself?
Access and removal steps differ by vehicle. Some designs may involve disconnecting a vent hose and removing the valve, but that is not a universal procedure. Consult the service information for the exact vehicle before starting, including instructions for access, replacement, and any related hose or seal checks. If the valve is difficult to reach or the diagnosis is uncertain, have a qualified technician handle it.
Quick Recap
Rank #4
- Replace Part Number: This valve direct replacement OE number is 11810AA131, the same performance and function as a factory part. Please check OE number and your models to ensure perfect fit before purchasing.
- Compatibility: Compatible with Subaru vehicle, include 2013-2019 Outback/ 2012-2016 Impreza/ 2011-2018 Forester/ 2013-2020 BRZ/ 2013-2019 Legacy/ 2013-2015 XV Crosstrek/ 2016-2017 Crosstrek.
- High Quality: Made of high quality material with precision craftsmanship that high-temperature resistant and structural stability to withstand any environment for long service life.
- Excellence Function: Helps regulating pressure and avoid seal failures while maintaining engine normal operation and improve engine efficiency.
- Simple Maintenance: Designed for direct installation for convenient and fast without professional tools and modifications.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
