Where is the knock sensor located and how do you remove and install it on Subaru Legacy?

The knock sensor is situated below the intake manifold, upon the top of the engine block, to one side of the centre line of casings and near its rear end. For removal of the knock sensor, first take off the engine cover and disconnect a wire from its negative terminal. As for turbocharged models, remove them also from intercooler connections. For knocking sensor electrical connector disconnection push release tab and separate these two halves. See how it is placed before taking off and make a marking on an engine block where this pigtail is found. Take out this knock sensor retaining bolt then pull out this knock sensor. To fit in a new knock sensor reverse back with previous steps ensuring that tightening torque amount is recommended by manufacturer for particular vehicle model.

Genuine Subaru Legacy Knock Sensor

Engine Knock Sensor

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14 Knock Sensors found

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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA140
$90.56 MSRP: $131.25
You Save: $40.69 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2009 Subaru Legacy | 2.5i, 2.5i Base, 2.5i Limited, Base, GT, GT Limited, XT Limited | 2.5L H4, 2.5L H4 Turbo
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Subaru Legacy Knock Sensor
Part Number: 22060AA070
$94.53 MSRP: $137.00
You Save: $42.47 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Knock
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1999-2001 Subaru Legacy | Base, Brighton, Cold Weather, GT, L, Limited, Post, SUS Limited | 2.2L H4 Series, 2.5L H4
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA100
$95.75 MSRP: $138.77
You Save: $43.02 (31%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2002-2004 Subaru Legacy | Baja, Baja-S, Base, Brighton, Cold Weather, GT, L, Limited, L-S, SUS Limited | 2.5L H4
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA160
$149.76 MSRP: $218.95
You Save: $69.19 (32%)
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Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Replaced by: 22060AA180
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2012-2017 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 2.5L H4, 2.5L H4 DOHC, 3.6L H6
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA130
$95.75 MSRP: $138.77
You Save: $43.02 (31%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2006-2011 Subaru Legacy | 3.0R, 3.0R Limited, 3.0R LL-Bean, 3.6R, 3.6R Limited, 3.6R Premium | 3.0L H6, 3.6L H6
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA18A
$94.88 MSRP: $137.50
You Save: $42.62 (31%)
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Product Specifications
- Other Name: Sensor Assembly-Knock
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2017-2021 Subaru Legacy | 2.4R F/R-O, 2.4R Limited, 2.4R Touring, 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring | 2.4L H4 DIT, 2.5L H4, 2.5L H4 DI
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA111
$95.75 MSRP: $138.77
You Save: $43.02 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2004-2006 Subaru Legacy | 2.5i, 2.5i Limited, Baja-B, GT, GT Limited | 2.5L H4, 2.5L H4 Turbo
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Subaru Legacy Knock Sensor
Part Number: 22060AA061
$89.99 MSRP: $130.42
You Save: $40.43 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1997-1999 Subaru Legacy | Brighton, GT, L, LS, LS-I, Out Back, Post, SUS | 2.2L H4 , 2.2L H4 (New EVAPO), 2.5L H4
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA150
$83.66 MSRP: $121.25
You Save: $37.59 (31%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- 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 Knock Sensor
Part Number: 22060AA031
$88.80 MSRP: $128.70
You Save: $39.90 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock
- Replaces: 22060AA030
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1990-1996 Subaru Legacy | Base, Brighton, GT, L, LS, LS-D, LS-I, Out Back, Post, Turbo | 2.2L H4, 2.2L H4 (New EVAPO), 2.5L H4
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Subaru Legacy PT118289 Knock Sensor
Part Number: 22060AA030
$88.80 MSRP: $128.70
You Save: $39.90 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock
- Replaced by: 22060AA031
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 1990-1996 Subaru Legacy | Base, Brighton, GT, L, LS, LS-D, LS-I, Out Back, Post, Turbo | 2.2L H4 , 2.5L H4
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Subaru Legacy Knock Sensor Assembly
Part Number: 22060KA040
$87.46 MSRP: $126.75
You Save: $39.29 (31%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2005 Subaru Legacy | 3.0R, 3.0R Limited, 3.0R LL-Bean | 3.0L H6
View related parts
Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA180
$149.76 MSRP: $218.95
You Save: $69.19 (32%)
Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- Replaces: 22060AA160
- Warranty: This genuine part is guaranteed by Subaru's factory warranty.
Fits the following Vehicles:
- 2012-2019 Subaru Legacy | 2.5i, 2.5i Limited, 2.5i Premium, 2.5i Sport, 2.5i Touring, 3.6R, 3.6R Limited, 3.6R Premium, 3.6R Touring | 2.5L H4, 2.5L H4 DOHC, 3.6L H6
View related parts
Subaru Legacy Knock Sensor Assembly
Part Number: 22060AA081
$95.75 MSRP: $138.77
You Save: $43.02 (31%)
Product Specifications
- Other Name: Sensor Assembly-Knock; Knock Sensor
- 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

Subaru Legacy Knock Sensor

The Knock Sensor of a Subaru Legacy detects abnormal combustion in the cylinders. It signals the engine control unit to keep the ignition timing within safe limits to prevent damage. The engine has a Knock Sensor fixed to its block that has a piezoelectric element which converts the vibrations caused by pressure spikes into an electrical signal. When the signal is received, the computer will retard the timing incrementally until knock ceases. Then the computer carefully advances the timing so it remains just below the optimal knock threshold. This consistent feedback from the Knock Sensor allows the Subaru powertrain to ensure performance continuity. It is the support of the Legacy for fuel efficiency and reduced emissions. This is despite changes in fuel grade, temperature, or altitude. To prevent damage to the pistons, bearings, and other internal parts, it curtails any prolonged detonation. The function of the Knock Sensor gives the engine control unit information on the operation of the engine which will direct timing for each cylinder. As a result, each Subaru Legacy cylinder will fire and operate smoothly under all driving conditions. In the event of a component failure, the control unit may trigger a dashboard warning light and restrict engine output momentarily. The engine will continue to run until the Subaru system begins receiving accurate Knock Sensor information again. After this, the Legacy will revert to normal operation.

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

Knock Sensor Assembly
22060AA140
Q:
Where is the knock sensor located and how do you remove and install it on Subaru Legacy?
Posted by Ariane R.
A:
The knock sensor is situated below the intake manifold, upon the top of the engine block, to one side of the centre line of casings and near its rear end. For removal of the knock sensor, first take off the engine cover and disconnect a wire from its negative terminal. As for turbocharged models, remove them also from intercooler connections. For knocking sensor electrical connector disconnection push release tab and separate these two halves. See how it is placed before taking off and make a marking on an engine block where this pigtail is found. Take out this knock sensor retaining bolt then pull out this knock sensor. To fit in a new knock sensor reverse back with previous steps ensuring that tightening torque amount is recommended by manufacturer for particular vehicle model.
Answered by Subaru Parts Specialist Anthony / Apr 10, 2026