Where is the knock sensor located and How to remove and install on Mazda 3?

The location of the knock sensor is in the front side of the block and at the back of the runners of the intake manifold. The first step would be to take off the battery cover and unplug the cable in the negative battery terminal. The intake manifold should be removed next. You can then disconnect the electrical connector to the knock sensor followed by removing the bolt of the knock sensor and removing the knock sensor. To install it, repeat the steps of removing it and tighten the knock sensor bolt to the required tightness.

How to replace the knock sensor on Mazda 6?

In four-cylinder models, the knock sensor is on the front of the block, behind the bunds of the intake manifold. Starting with taking out the cable on the negative battery terminal and then take out the intake manifold. The second step includes disconnecting the electrical connector connected to the knock sensor, retaining bolt, and knock sensor. Installation is the opposite of removing, in making sure that the retaining bolt is snug according to the required torque. To check the V6 3.0L models, the first step is to disconnect the negative battery terminal, lift the vehicle safely on jackstands, and take off the engine compartment under cover. Unfit the electrical connector of the knock sensor, remove the retaining bolt and remove the knock sensor and then repeat the steps of the operation by reversing the steps and fitting the bolt back again with the required torque. In 3.7L models, where there are two knock sensors in the valley between the cylinder heads, disconnect the electrical connections of the knock sensors and remove the retaining bolts that hold the sensors. The process of reinstallation is in reverse order and the retaining bolts are tightened to the required torque.

Genuine Mazda Knock Sensor

Engine Knock Sensor

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26 Knock Sensors found

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Mazda Knock Sensor Part Number: LF01-18-921
$43.75 MSRP: $58.35
You Save: $14.60 (26%)
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Product Specifications
- Other Name: Sensor, Knock
- Replaces: 1F20-18-921A, 1F20-18-921
Fits the following Mazda Models:
- 3 | 2010-2013, 2004-2006 | i, S, SP23 | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 5 | 2012-2015, 2006-2007 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2003-2013 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L GAS
- B2300 | 2001-2009 | Base, SE, SX | 4 Cyl 2.3 L GAS
- CX-7 | 2010-2012 | Sport, SV, Touring | 4 Cyl 2.5 L GAS
- MX-5 Miata | 2006-2015 | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, Special Edition, Sport, SV, Touring | 4 Cyl 2.0 L GAS
- Tribute | 2008-2011, 2005-2006 | Hybrid, i, S | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS, 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mazda Knock Sensor Part Number: PE01-18-921
$62.38 MSRP: $83.18
You Save: $20.80 (26%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- 3 | 2012-2018 | Grand Touring, i, i Grand Touring, I Sport, i SV, I Touring, Mazdaspeed, S, s Grand Touring, s Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2014-2017 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-3 | 2016-2018 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS
- CX-5 | 2013-2018 | Grand Select, Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- MX-5 Miata | 2016-2018 | Club, Grand Touring, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda Knock Sensor Part Number: P31E-18-921
$93.71 MSRP: $124.98
You Save: $31.27 (26%)
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Product Specifications
- Other Name: Sensor, Knock
- Replaces: P32E-18-921
Fits the following Mazda Models:
- 3 | 2019-2024 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Preferred, Premium, Select, Select Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2018-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-3 | 2019-2021 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS
- CX-30 | 2020-2023 | 2.5 S, 2.5 S Carbon Edition, 2.5 Turbo, Base, Preferred, Premium, Select | 4 Cyl 2.5 L GAS
- CX-5 | 2019-2024 | 2.5 S, 2.5 S Carbon Edition, 2.5 Turbo, 2.5 Turbo Signature, Carbon Edition, Carbon Edition Turbo, Grand Touring, Grand Touring Reserve, Signature, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-50 | 2023-2024 | 2.5 S, 2.5 Turbo | 4 Cyl 2.5 L GAS
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
- MX-5 Miata | 2019-2023 | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda Knock Sensor Part Number: LF02-18-921
$95.44 MSRP: $127.28
You Save: $31.84 (26%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- 3 | 2007-2013 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS
- 5 | 2008-2010 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS
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Mazda Knock Sensor Part Number: N3H1-18-921A
$109.54 MSRP: $146.07
You Save: $36.53 (26%)
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Product Specifications
- Other Name: Sensor, Knock
- Replaces: N3H1-18-921
Fits the following Mazda Models:
- RX-8 | 2004-2011 | 40th Anniversary Edition, Base, Grand Touring, R3, Shinka, Sport, Touring | 2 Cyl 1.3 L GAS
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Mazda Knock Sensor Part Number: L807-18-921
$114.39 MSRP: $152.54
You Save: $38.15 (26%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- 3 | 2007-2013 | Mazdaspeed, S | 4 Cyl 2.3 L GAS
- 6 | 2006-2007 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
- CX-7 | 2007-2012 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS
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Mazda Knock Sensor Part Number: GY01-18-921C
$174.33 MSRP: $232.48
You Save: $58.15 (26%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- MPV | 2000-2001 | DX, ES, LX | 6 Cyl 2.5 L GAS
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Mazda Knock Sensor Part Number: GY02-18-921A
$180.35 MSRP: $240.51
You Save: $60.16 (26%)
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Product Specifications
- Other Name: Sensor, Knock (Mpvm)
- Replaces: GY02-18-921
Fits the following Mazda Models:
- MPV | 2002-2006 | ES, LX, LX-SV | 6 Cyl 3.0 L GAS
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Mazda Knock Sensor Part Number: 1F21-18-921
$19.38 MSRP: $40.64
You Save: $21.26 (53%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- B3000 | 2004-2007 | Base, DS, SE | 6 Cyl 3.0 L GAS
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Mazda Knock Sensor Part Number: KJ01-18-921A
$185.33 MSRP: $247.15
You Save: $61.82 (26%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- Millenia | 1995-2002 | Base, Millennium Edition, S | 6 Cyl 2.3 L GAS
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Mazda Knock Sensor Part Number: FP39-18-921
$192.49 MSRP: $256.71
You Save: $64.22 (26%)
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Product Specifications
- Replaces: FSD7-18-921C
Fits the following Mazda Models:
- 626 | 1998-2002 | DX, ES, LX | 4 Cyl 2.0 L GAS
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Mazda Knock Sensor Part Number: KL01-18-921B
$207.55 MSRP: $276.80
You Save: $69.25 (26%)
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Product Specifications
- Other Name: Sensor
Fits the following Mazda Models:
- 626 | 1993-2002 | DX, ES, LX | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- MX-3 | 1992-1995 | Base, GS, SE | 4 Cyl 1.6 L GAS, 6 Cyl 1.8 L GAS
- MX-6 | 1993-1997 | Base, LS, M Edition | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- Millenia | 1995-1996 | Base, L | 6 Cyl 2.5 L GAS
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Mazda Knock Sensor Part Number: JEB3-18-921A
$238.85 MSRP: $318.53
You Save: $79.68 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- Miata | 1999-2005 | 10th Anniversary, Base, LS, Mazdaspeed, SE, Shinsen | 4 Cyl 1.8 L GAS
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Mazda Knock Sensor Part Number: N3A1-18-921A
$325.14 MSRP: $433.60
You Save: $108.46 (26%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Sensor
- Replaces: N3A1-18-921
Fits the following Mazda Models:
- RX-7 | 1993-1995 | Base, R1, R2, Touring | 2 Cyl 1.3 L GAS
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Mazda Knock Sensor Part Number: 1F22-18-921
$11.00 MSRP: $14.44
You Save: $3.44 (24%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- B4000 | 2004-2009 | Base, DS, SE | 6 Cyl 4.0 L GAS
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Mazda Knock Sensor Part Number: JE49-18-921A
$53.77 MSRP: $70.58
You Save: $16.81 (24%)
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Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- 929 | 1992-1993 | Base | 6 Cyl 3.0 L GAS
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Mazda Knock Sensor Part Number: FS7N-18-921A
Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- Protege | 2001-2003 | DX, ES, LX, Mazdaspeed, MP3 | 4 Cyl 2.0 L GAS
- Protege5 | 2002-2003 | Base | 4 Cyl 2.0 L GAS
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Mazda Knock Sensor Part Number: AJ03-18-921A
Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- Tribute | 2001-2006 | DX, ES, LX, S | 6 Cyl 3.0 L GAS
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Mazda Knock Sensor Part Number: AJ57-18-921A
Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- 6 | 2003-2008 | i, Mazdaspeed, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda Knock Sensor Part Number: CY01-18-921
Product Specifications
- Other Name: Sensor, Knock
Fits the following Mazda Models:
- 6 | 2009-2013 | S | 6 Cyl 3.7 L GAS
- CX-9 | 2007-2015 | Grand Touring, Sport, Touring | 6 Cyl 3.5 L GAS, 6 Cyl 3.7 L GAS

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Mazda Knock Sensor

When fuel is not ignited correctly, the regular cycle of the engine will be interrupted, which might damage some parts inside it. For this reason, a knock sensor is installed, a piezo-electric component designed to allow the engine to run with ignition timing as far ahead as possible. The Mazda knock sensor picks up a rapid change in pressure on the cylinder walls and sends this message to the engine control unit for adjustment of ignition time. It is essential to check regularly and replace knock sensors if necessary.

Whenever you need replacements, opt for genuine Mazda Knock Sensors. Because they meet the manufacturer's criteria, it guarantees that replacements fit perfectly. Thus, these make better choices for people who care about driving. Why should you shop at MazdaPartsNow.com? We sell genuine Mazda Knock Sensors. In our online catalog, there is a wide range of different parts. These are delivered directly from authorized Mazda dealers only so that customers can be sure of their security throughout any transaction while using our website. Furthermore, you can also quickly search for OEM parts you want because of our user-friendly site navigation. Choose us for a genuine Mazda Knock Sensor that keeps your car running like new.

Mazda Knock Sensor Parts and Q&A

Knock Sensor
LF02-18-921
Q: Where is the knock sensor located and How to remove and install on Mazda 3?
A:
The location of the knock sensor is in the front side of the block and at the back of the runners of the intake manifold. The first step would be to take off the battery cover and unplug the cable in the negative battery terminal. The intake manifold should be removed next. You can then disconnect the electrical connector to the knock sensor followed by removing the bolt of the knock sensor and removing the knock sensor. To install it, repeat the steps of removing it and tighten the knock sensor bolt to the required tightness.
Knock Sensor
L807-18-921
Q: How to replace the knock sensor on Mazda 6?
A:
In four-cylinder models, the knock sensor is on the front of the block, behind the bunds of the intake manifold. Starting with taking out the cable on the negative battery terminal and then take out the intake manifold. The second step includes disconnecting the electrical connector connected to the knock sensor, retaining bolt, and knock sensor. Installation is the opposite of removing, in making sure that the retaining bolt is snug according to the required torque. To check the V6 3.0L models, the first step is to disconnect the negative battery terminal, lift the vehicle safely on jackstands, and take off the engine compartment under cover. Unfit the electrical connector of the knock sensor, remove the retaining bolt and remove the knock sensor and then repeat the steps of the operation by reversing the steps and fitting the bolt back again with the required torque. In 3.7L models, where there are two knock sensors in the valley between the cylinder heads, disconnect the electrical connections of the knock sensors and remove the retaining bolts that hold the sensors. The process of reinstallation is in reverse order and the retaining bolts are tightened to the required torque.