What is the purpose of the Positive Crankcase Ventilation (PCV) system,PCV Hose and PCV Valve and how to replace on Subaru Legacy?

The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by directing blow-by gases and crankcase vapors into the intake manifold, where they are mixed with intake air before entering the combustion chambers where they mix with the air/fuel mixture that gets used during combustion. It does so by taking fresh air from the housing of an air filter and then routing it through a group of tubes into the crankcase where it mixes up with blow-by gases before being extracted out of this area through PCV valve via intake vacuum, which finally directs them into the intake manifold. The throttle body is connected to PCV valve and there is a ventilation hose, leading from it to a vented chamber inside the engine, such that when you lift off or close your throttle valves, vacuum created in your intake manifold pulls fresh air through both these hoses into your engine. However, at full throttle opening, there is usually not enough vacuum generated within your engine's intake manifold to be able to suck any additional atmospheric pressure inside its crankcase neither can it draw out any leftover blowby gases or even vapors from this crankcase. Instead, other conduits allow more than sufficient amounts of these two substances to escape from the engine block while ending up in either its induction pathway like cold-air pipe or even in an open-element type of air cleaner that could be contained within one's vehicle's hood; whereby all this happens simultaneously as we have mentioned earlier. It is important for one to regularly check their PCV system for clogs or damage because if this passage gets obstructed then leaking seals start happening among other things. There are easy ways of checking fresh air inlet tubes for cracks and wear; replace any malfunctioning ones found here after disconnection. A second component making up part of an emission control system fitted onto most vehicles' engines is known as your "crankcase ventilation" hose meaning that this would also need inspection as well. PCV valve, which is on a crankcase's right rear corner, can be unscrewed and substituted as necessary. One must always maintain their car's PCV system regularly so that it functions optimally as well as emits less amounts of harmful substances into the atmosphere; this guarantees effective performance since all wastes produced tend to minimize when dealt with immediately.

Genuine Subaru Legacy PCV Valve

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10 PCV Valves found

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Subaru Legacy Engine Valve Complete Control
Part Number: 11810AA131
$27.95 MSRP: $40.49
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Product Specifications
- Other Name: Valve Complete Control; PCV Valve
- Replaces: 11810AA130
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2013-2019 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4, 2.5L H4 DOHC
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Subaru Legacy Valve Complete Control
Part Number: 11810AA130
$27.95 MSRP: $40.49
You Save: $12.54 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Complete-Control
- Replaced by: 11810AA131
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2013-2016 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4, 2.5L H4 DOHC
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Subaru Legacy Valve Complete Control
Part Number: 11810AA100
$29.41 MSRP: $42.62
You Save: $13.21 (31%)
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Product Specifications
- Other Name: Valve Complete-Control; PCV Valve
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005-2019 Subaru Legacy | 2.5i, 2.5i Base, 2.5i Limited, 3.0R, 3.0R Limited, 3.0R LL-Bean, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring, Base | 2.5L H4, 3.0L H6, 3.6L H6
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Subaru Legacy Valve Complete Control
Part Number: 11810AA040
$16.84 MSRP: $24.40
You Save: $7.56 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: PCV Valve
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2009 Subaru Legacy | 2.5i, 2.5i Limited, Baja, Baja-B, Baja-S, Base, Brighton, Cold Weather, GT, GT Limited, L, Limited, L-S, SUS Limited, XT Limited | 2.5L H4, 2.5L H4 Turbo
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Subaru Legacy Valve COMPL-Cont
Part Number: 11810AA200
$11.60 MSRP: $16.12
You Save: $4.52 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Replaces: 11810AA180
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2020-2021 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.5L H4 DI
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Subaru Legacy Air Control Valve
Part Number: 11810AA000
$11.95 MSRP: $16.60
You Save: $4.65 (29%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Complete-Control; PCV Valve
- Replaces: 460257000
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1990-2001 Subaru Legacy | Base, Brighton, Cold Weather, GT, L, Limited, LS, LS-D, LS-I, Out Back, Post, SUS, SUS Limited, Turbo | 2.2L H4 , 2.2L H4 (New EVAPO), 2.5L H4
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Subaru Legacy Valve Complete Control
Part Number: 11810AA090
$13.80 MSRP: $19.17
You Save: $5.37 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Complete-Control; PCV Valve
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2010-2012 Subaru Legacy | 2.5GT Limited, 2.5GT Premium, 2.5i, 2.5i Limited, 2.5i Premium | 2.5L H4 SOHC, 2.5L H4 Turbo
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Subaru Legacy Valve Complete-Control
Part Number: 11810AA021
$20.11 MSRP: $29.15
You Save: $9.04 (32%)
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Product Specifications
- Other Name: PCV Valve
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2001-2004 Subaru Legacy | Flat6, Flat6 L.L.Bean, Flat6-S, SUS Flat6 | 3.0L H6
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Subaru Legacy Valve Complete Cont
Part Number: 11810AA210
$16.32 MSRP: $23.65
You Save: $7.33 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Replaces: 11810AA170
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2020-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring | 2.4L H4 DIT
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Subaru Legacy VALVE COMPL-CONT
Part Number: 11810AA250
$30.90 MSRP: $44.78
You Save: $13.88 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2022-2025 Subaru Legacy | 4 Cyl 2.4L

Subaru Legacy PCV Valve

The Subaru Legacy PCV Valve is a small but important device that pulls blow-by gases from the crankcase and sends them to the intake stream. This process helps keep the oil clean, improves combustion, and reduces emissions. By utilizing intake manifold vacuum, the PCV Valve controls the flow. As the suction peaks at idle, it is almost completely shut. As the throttle rises, it opens wider to burn the heavier rush of fumes rather than letting it escape. In the early 1990s, the Legacy models had a PCV Valve made of metal that had a spring-loaded mechanism. This valve is threaded into the block. Later Subaru engines started using a PCV Valve made of lighter composite. This consists of a snap-in hose. Both of these styles work on the same one-way action. They also work as flame arresters to protect the crankcase from backfires or turbo pressure spikes. Both types of PCV Valve have a venting capability that helps keep that pressure from pushing past piston rings to help, more importantly, with compression and therefore power. To keep the new Legacy editions operating at their optimal, periodic inspection for varnish or sludge is essential for all Subaru owners to maintain fuel economy and environmentally friendly vehicles.

Our website stands as the go-to online destination for OEM Subaru Legacy PCV Valve. With complete lines of genuine Subaru Legacy PCV Valve available at unbeatable market prices, we ensure top quality, reliability, and durability. Each part comes backed by the manufacturer's warranty, reinforcing your trust in our offerings.

Subaru Legacy PCV Valve Parts Questions & Experts Answers

Valve Complete Control
11810AA040
Q:
What is the purpose of the Positive Crankcase Ventilation (PCV) system,PCV Hose and PCV Valve and how to replace on Subaru Legacy?
Posted by Marcin C.
A:
The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by directing blow-by gases and crankcase vapors into the intake manifold, where they are mixed with intake air before entering the combustion chambers where they mix with the air/fuel mixture that gets used during combustion. It does so by taking fresh air from the housing of an air filter and then routing it through a group of tubes into the crankcase where it mixes up with blow-by gases before being extracted out of this area through PCV valve via intake vacuum, which finally directs them into the intake manifold. The throttle body is connected to PCV valve and there is a ventilation hose, leading from it to a vented chamber inside the engine, such that when you lift off or close your throttle valves, vacuum created in your intake manifold pulls fresh air through both these hoses into your engine. However, at full throttle opening, there is usually not enough vacuum generated within your engine's intake manifold to be able to suck any additional atmospheric pressure inside its crankcase neither can it draw out any leftover blowby gases or even vapors from this crankcase. Instead, other conduits allow more than sufficient amounts of these two substances to escape from the engine block while ending up in either its induction pathway like cold-air pipe or even in an open-element type of air cleaner that could be contained within one's vehicle's hood; whereby all this happens simultaneously as we have mentioned earlier. It is important for one to regularly check their PCV system for clogs or damage because if this passage gets obstructed then leaking seals start happening among other things. There are easy ways of checking fresh air inlet tubes for cracks and wear; replace any malfunctioning ones found here after disconnection. A second component making up part of an emission control system fitted onto most vehicles' engines is known as your "crankcase ventilation" hose meaning that this would also need inspection as well. PCV valve, which is on a crankcase's right rear corner, can be unscrewed and substituted as necessary. One must always maintain their car's PCV system regularly so that it functions optimally as well as emits less amounts of harmful substances into the atmosphere; this guarantees effective performance since all wastes produced tend to minimize when dealt with immediately.
Answered by Subaru Parts Specialist Edgar / Feb 25, 2023