How to Remove the Diverter Valve on a Subaru Impreza?

To remove the air bypass valve on 2007 and earlier models, first remove the engine cover (if equipped), then disconnect the vacuum hose from the air bypass valve, remove the air bypass valve mounting bolts, and lift the valve up and disconnect the turbocharger inlet duct from the valve. For 2008 and later models, disconnect the vacuum hose and air bypass hose from the air bypass valve, remove the air bypass valve mounting bolts, and then remove the air bypass valve. Installation is the reverse of removal.

Genuine Subaru Impreza Diverter Valve

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7 Diverter Valves found

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Subaru Impreza Valve Assembly Air Bypass
Part Number: 14471AA143
$153.18 MSRP: $223.95
You Save: $70.77 (32%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Valve Assembly-Air Bypass; By-Pass Valve
- Replaces: 14471AA142, 14471AA140, 14471AA141
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004-2011 Subaru Impreza | STI, STI Limited, STI Special Edition, STI Sport, WRX, WRX TR | 2.5L H4 Turbo
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Subaru Impreza Valve Assembly Air Bypass
Part Number: 14471AA240
$93.61 MSRP: $135.67
You Save: $42.06 (31%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Assembly-Air Bypass; By-Pass Valve
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008-2011 Subaru Impreza | 2.5 GT, WRX, WRX Sport, WRXSS | 2.5L H4 Turbo
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Subaru Impreza Valve Assembly Air Bypass
Part Number: 14471AA120
$185.36 MSRP: $271.00
You Save: $85.64 (32%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Valve Assembly-Air Bypass
- Replaced by: 14471AA1209L
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2005 Subaru Impreza | WRX | 2.0L H4 Turbo
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Subaru Impreza Valve Assembly Air Bypass
Part Number: 14471AA140
$153.18 MSRP: $223.95
You Save: $70.77 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Assembly-Air Bypass
- Replaced by: 14471AA143
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004 Subaru Impreza | STI | 2.5L H4 Turbo
View related parts
Subaru Impreza Valve Assembly Air Bypass
Part Number: 14471AA141
$153.18 MSRP: $223.95
You Save: $70.77 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Valve Assembly-Air Bypass
- Replaced by: 14471AA143
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005 Subaru Impreza | STI | 2.5L H4 Turbo
View related parts
Subaru Impreza Valve Assembly-Air Bypass
Part Number: 14471AA142
$153.18 MSRP: $223.95
You Save: $70.77 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaced by: 14471AA143
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005 Subaru Impreza | STI | 2.5L H4 Turbo
View related parts
Subaru Impreza Valve Assembly Air Bypass
Part Number: 14471AA130
$101.34 MSRP: $146.87
You Save: $45.53 (31%)
Product Specifications
- Other Name: Valve Assembly-Air Bypass; By-Pass Valve
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2008 Subaru Impreza | WRX, WRX Sport | 2.5L H4 Turbo

Subaru Impreza Diverter Valve

The Subaru Impreza Diverter Valve keeps the engine safe and emissions low by smartly redirecting pressurized air rather than letting it trigger backfires or wasted boost. Early Subaru models without turbos utilize a secondary air-injection Diverter Valve. During warm-up, this component allows the pump to force fresh air into the exhaust ports to help burn off unspent fuel. It then dumps flow to atmosphere on deceleration, so no raw air meets a rich mixture. When normal temperature conditions are achieved, vacuum signals cause this Diverter Valve to direct engine air downstream to the catalytic converter to trim hydrocarbons and carbon monoxide. Later Impreza turbo models featured a manifold-vacuum Diverter Valve which ensures that any remaining boost is diverted back into the intake as soon as the throttle is snapped shut, keeping the turbo spinning forward and the mixture in balance. The designs both function to halt damaging pressure spikes. However, they have a marked difference in what happens to the air that does not vent. In the case of the injection version, the spare air vents outside the system. On the other hand, the turbo version, as the name suggests, recycles this spare air within the system. Maintaining the Diverter Valve will help every Subaru Impreza run cleaner, protect components, and respond crisply.

Our website stands as the go-to online destination for OEM Subaru Impreza Diverter Valve. With complete lines of genuine Subaru Impreza Diverter 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 Impreza Diverter Valve Parts Questions & Experts Answers

Valve Assembly Air Bypass
14471AA240
Q:
How to Remove the Diverter Valve on a Subaru Impreza?
Posted by Edward A.
A:
To remove the air bypass valve on 2007 and earlier models, first remove the engine cover (if equipped), then disconnect the vacuum hose from the air bypass valve, remove the air bypass valve mounting bolts, and lift the valve up and disconnect the turbocharger inlet duct from the valve. For 2008 and later models, disconnect the vacuum hose and air bypass hose from the air bypass valve, remove the air bypass valve mounting bolts, and then remove the air bypass valve. Installation is the reverse of removal.
Answered by Subaru Parts Specialist Albert / Mar 27, 2025