What is the Positive Crankcase Ventilation (PCV) system and PCV Valve and how does it work to reduce hydrocarbon emissions on Lexus ES300?

The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by cutting crankcase vapors. It does this by circulating fresh air from the cleaner to the crankcase, mixing it with blow-by gases. These gases are moved through a PCV valve and taken back to the intake. The PCV has the PCV valve, a blow-by filter, and vacuum hoses connecting them to the engine. The PCV valve is intended to block flow during high-intake vacuum conditions to maintain consistent quality. If there is anything unusual, the system allows blow-by gases to go back into the air cleaner from the vent tube.

What is the Role and Importance of the Positive Crankcase Ventilation (PCV) System and PCV Valve in Reducing Hydrocarbon Emissions on Lexus ES350?

The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It circulates fresh air from the air cleaner through the crankcase, mixing it with blow-by gases. The mixture is rerouted through a PCV valve to the intake manifold. The PCV valve restricts flow when intake manifold vacuum is high, maintaining idle quality. In abnormal conditions, excessive blow-by gases flow back through the crankcase vent tube into the air cleaner for normal combustion. The PCV system consists of the PCV valve, blow-by filter, and vacuum hoses connecting these components to the engine. Regularly checking and replacing the PCV valve is important.

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37 PCV Valves found

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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-38010
$8.24 MSRP: $10.63
You Save: $2.39 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
- Manufacturer Note: *119
Fits the following Lexus Models:
- GS350 | 2007-2011 | 8 Cyl 4.6L
- GS430 | 2007 | 8 Cyl 4.6L
- GS460 | 2008-2011 | 8 Cyl 4.6L
- GX460 | 2010-2023 | G, Z | 8 Cyl 4.6L
- LS460 | 2007-2017 | 8 Cyl 4.6L
- LX570 | 2008-2021 | 8 Cyl 5.7L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-31050
$9.79 MSRP: $12.63
You Save: $2.84 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS200t | 2016 | 6 Cyl 3.5L
- GS300 | 2006 | 6 Cyl 3.5L
- GS350 | 2013-2016, 2007-2011 | 6 Cyl 3.5L
- GS430 | 2006-2007 | 6 Cyl 3.5L
- GS450h | 2013-2016 | 6 Cyl 3.5L
- GS460 | 2008-2011 | 6 Cyl 3.5L
- IS Turbo | 2017 | LUX | 6 Cyl 3.5L
- IS200t | 2016 | LUX | 6 Cyl 3.5L
- IS250 | 2006-2015 | 350C, LUX | 6 Cyl 3.5L
- IS300 | 2016-2018 | LUX | 6 Cyl 3.5L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-31040
$6.57 MSRP: $8.46
You Save: $1.89 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- ES350 | 2007-2010 | 6 Cyl 3.5L
- GS300 | 2006 | 6 Cyl 3.0L
- GS350 | 2007 | 6 Cyl 3.0L
- GS430 | 2006-2007 | 6 Cyl 3.0L
- IS200t | 2016 | LUX | 6 Cyl 2.5L
- IS250 | 2014-2015, 2006-2010 | LUX | 6 Cyl 2.5L
- IS300 | 2016 | LUX | 6 Cyl 2.5L
- IS350 | 2014-2016, 2006-2010 | LUX | 6 Cyl 2.5L
- RX330 | 2006 | STD | 6 Cyl 3.5L
- RX350 | 2007-2009 | STD | 6 Cyl 3.5L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-50020
$8.37 MSRP: $10.79
You Save: $2.42 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS300 | 1998-2004 | 8 Cyl 4.0L, 8 Cyl 4.3L
- GS400 | 1998-2000 | 8 Cyl 4.0L, 8 Cyl 4.3L
- GS430 | 2001-2004 | 8 Cyl 4.0L, 8 Cyl 4.3L
- LS400 | 1997-2000 | 8 Cyl 4.0L
- LS430 | 2001-2004 | 8 Cyl 4.3L
- LX470 | 1998-2003 | 8 Cyl 4.7L
- SC300 | 1997-2000 | 8 Cyl 4.0L
- SC400 | 1997-2000 | 8 Cyl 4.0L
- SC430 | 2002-2004 | 8 Cyl 4.3L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-20040
$8.24 MSRP: $10.63
You Save: $2.39 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- ES300 | 2001-2003 | 6 Cyl 3.0L, 6 Cyl 3.3L
- ES330 | 2004-2006 | 6 Cyl 3.0L, 6 Cyl 3.3L
- RX300 | 2001-2003 | 6 Cyl 3.0L
- RX330 | 2004-2006 | STD | 6 Cyl 3.3L
- RX350 | 2007 | STD | 6 Cyl 3.3L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-36050
$12.24 MSRP: $15.78
You Save: $3.54 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS Turbo | 2017 | 4 Cyl 2.0L
- GS200t | 2016 | 4 Cyl 2.0L
- GS300 | 2018-2019 | 4 Cyl 2.0L
- GS350 | 2015-2020 | 4 Cyl 2.0L
- GS450h | 2015-2018 | 4 Cyl 2.0L
- IS Turbo | 2017 | LUX | 4 Cyl 2.0L
- IS200t | 2016 | LUX | 4 Cyl 2.0L
- IS250 | 2015 | LUX | 4 Cyl 2.0L
- IS300 | 2016-2024 | LUX | 4 Cyl 2.0L
- IS350 | 2015-2024 | LUX | 4 Cyl 2.0L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-46031
$19.60 MSRP: $25.27
You Save: $5.67 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS300 | 2001-2005 | 6 Cyl 3.0L
- GS430 | 2001-2005 | 6 Cyl 3.0L
- IS300 | 2001-2005 | 6 Cyl 3.0L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-50011
$14.05 MSRP: $18.11
You Save: $4.06 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- LS400 | 1990-1998 | 8 Cyl 4.0L
- SC300 | 1992-1998 | 8 Cyl 4.0L
- SC400 | 1992-1998 | 8 Cyl 4.0L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-31120
$6.57 MSRP: $8.46
You Save: $1.89 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- ES300h | 2013-2018 | 6 Cyl 3.5L
- ES350 | 2008-2018 | 6 Cyl 3.5L
- RX350 | 2008-2015 | STD | 6 Cyl 3.5L
- RX450h | 2010-2015 | STD | 6 Cyl 3.5L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-31130
$10.82 MSRP: $13.96
You Save: $3.14 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS200t | 2016 | 6 Cyl 2.5L
- GS350 | 2013-2016 | 6 Cyl 2.5L
- GS450h | 2013-2016 | 6 Cyl 2.5L
- IS200t | 2016 | LUX | 6 Cyl 2.5L
- IS250 | 2009-2015 | 250C, LUX | 6 Cyl 2.5L
- IS300 | 2016 | LUX | 6 Cyl 2.5L
- IS350 | 2009-2016 | 250C, LUX | 6 Cyl 2.5L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-38020
$11.21 MSRP: $14.46
You Save: $3.25 (23%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS F | 2016-2020 | 8 Cyl 5.0L
- IS F | 2008-2014 | 8 Cyl 5.0L
- IS300 | 2021-2024 | LUX | 8 Cyl 5.0L
- IS350 | 2021-2024 | LUX | 8 Cyl 5.0L
- IS500 | 2022-2024 | LUX | 8 Cyl 5.0L
- LC500 | 2018-2024 | 8 Cyl 5.0L
- LC500h | 2018-2024 | 8 Cyl 5.0L
- RC F | 2015-2024 | 8 Cyl 5.0L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-37010
$6.57 MSRP: $8.46
You Save: $1.89 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- CT200h | 2011-2017 | B, E | 4 Cyl 1.8L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-20020
$13.64 MSRP: $17.45
You Save: $3.81 (22%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation
Fits the following Lexus Models:
- ES300 | 1997-2001 | 6 Cyl 3.0L
- RX300 | 1999-2002 | 6 Cyl 3.0L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-46030
$13.53 MSRP: $17.45
You Save: $3.92 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS300 | 1993-2002 | 6 Cyl 3.0L
- GS400 | 1998-2000 | 6 Cyl 3.0L
- GS430 | 2001-2002 | 6 Cyl 3.0L
- IS300 | 2001-2002 | 6 Cyl 3.0L
- SC300 | 1993-2000 | 6 Cyl 3.0L
- SC400 | 1993-2000 | 6 Cyl 3.0L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-38030
$8.31 MSRP: $10.63
You Save: $2.32 (22%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation
- Manufacturer Note: *145
Fits the following Lexus Models:
- LX570 | 2009-2011 | 8 Cyl 5.7L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-20060
$12.50 MSRP: $16.12
You Save: $3.62 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- ES330 | 2004-2006 | 6 Cyl 3.3L
- RX330 | 2004-2005 | STD | 6 Cyl 3.3L
- RX400h | 2006-2008 | STD | 6 Cyl 3.3L
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Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-31150
$8.31 MSRP: $10.63
You Save: $2.32 (22%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation
- Manufacturer Note: (J)
- Replaced by: 12204-0P020
Fits the following Lexus Models:
- ES250 | 2021-2024 | 6 Cyl 3.5L
- ES300h | 2019-2024 | 6 Cyl 3.5L
- ES350 | 2019-2024 | 6 Cyl 3.5L
- GS Turbo | 2017 | 6 Cyl 3.5L
- GS200t | 2016 | 6 Cyl 3.5L
- GS300 | 2018-2019 | 6 Cyl 3.5L
- GS350 | 2015-2020 | 6 Cyl 3.5L
- GS450h | 2015-2018 | 6 Cyl 3.5L
- IS Turbo | 2017 | LUX | 6 Cyl 3.5L
- IS300 | 2017-2024 | LUX | 6 Cyl 3.5L
View More
View related parts
Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-0P020
$8.24 MSRP: $10.63
You Save: $2.39 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
- Manufacturer Note: (L)
- Replaces: 12204-31150
Fits the following Lexus Models:
- ES250 | 2021-2024 | 6 Cyl 3.5L
- ES300h | 2019-2024 | 6 Cyl 3.5L
- ES350 | 2019-2024 | 6 Cyl 3.5L
- GS Turbo | 2017 | 6 Cyl 3.5L
- GS200t | 2016 | 6 Cyl 3.5L
- GS300 | 2018-2019 | 6 Cyl 3.5L
- GS350 | 2015-2020 | 6 Cyl 3.5L
- GS450h | 2015-2018 | 6 Cyl 3.5L
- IS Turbo | 2017 | LUX | 6 Cyl 3.5L
- IS300 | 2017-2024 | LUX | 6 Cyl 3.5L
View More
View related parts
Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-31140
$14.05 MSRP: $18.11
You Save: $4.06 (23%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS Turbo | 2017 | 6 Cyl 3.5L
- GS200t | 2016 | 6 Cyl 3.5L
- GS300 | 2018-2019 | 6 Cyl 3.5L
- GS350 | 2013-2019 | 6 Cyl 3.5L
- GS450h | 2013-2018 | 6 Cyl 3.5L
View More
View related parts
Lexus Ventilation Valve Sub-Assembly
Part Number: 12204-50030
$12.89 MSRP: $16.62
You Save: $3.73 (23%)
Product Specifications
- Other Name: Valve Sub-Assy, Ventilation; PCV Valve
Fits the following Lexus Models:
- GS300 | 2003-2006 | 8 Cyl 4.3L
- GS350 | 2007-2008 | 8 Cyl 4.3L
- GS430 | 2003-2007 | 8 Cyl 4.3L
- GS460 | 2008 | 8 Cyl 4.3L
- GX470 | 2003-2005 | 8 Cyl 4.7L
- LS430 | 2003-2006 | 8 Cyl 4.3L
- LX470 | 2002-2007 | 8 Cyl 4.7L
- SC430 | 2003-2010 | 8 Cyl 4.3L
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Lexus PCV Valve Parts Questions & Experts Answers

Ventilation Valve Sub-Assembly
12204-20040
Q: What is the Positive Crankcase Ventilation (PCV) system and PCV Valve and how does it work to reduce hydrocarbon emissions on Lexus ES300?
A:
The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by cutting crankcase vapors. It does this by circulating fresh air from the cleaner to the crankcase, mixing it with blow-by gases. These gases are moved through a PCV valve and taken back to the intake. The PCV has the PCV valve, a blow-by filter, and vacuum hoses connecting them to the engine. The PCV valve is intended to block flow during high-intake vacuum conditions to maintain consistent quality. If there is anything unusual, the system allows blow-by gases to go back into the air cleaner from the vent tube.
Ventilation Valve Sub-Assembly
12204-31040
Q: What is the Role and Importance of the Positive Crankcase Ventilation (PCV) System and PCV Valve in Reducing Hydrocarbon Emissions on Lexus ES350?
A:
The Positive Crankcase Ventilation (PCV) system reduces hydrocarbon emissions by scavenging crankcase vapors. It circulates fresh air from the air cleaner through the crankcase, mixing it with blow-by gases. The mixture is rerouted through a PCV valve to the intake manifold. The PCV valve restricts flow when intake manifold vacuum is high, maintaining idle quality. In abnormal conditions, excessive blow-by gases flow back through the crankcase vent tube into the air cleaner for normal combustion. The PCV system consists of the PCV valve, blow-by filter, and vacuum hoses connecting these components to the engine. Regularly checking and replacing the PCV valve is important.