Where is the knock sensor located, and How to remove and reinstall it on Volvo S40?

For the 1.8 and 2.0 litre models the knock sensor is mounted on the cylinder block on the front facing side of the intake manifold. Start with removing the intake manifold then from the knock sensor disconnect the wiring connector. It is very important to record the fitted position of the sensor for correct reinstallation. After undoing the retaining bolt remove the sensor. For the 2.4 litre models, you first have to remove the air cleaner assembly and note the fitted positions of the sensors because they need to be fitted again in their original locations. Undo the bolts and remove the sensors in the front of the vehicle to remove the knock sensors and to remove the wiring plugs as the sensors are removed. During reinstallation, make sure you put the sensor/s back in the original locations with the angle of the wiring harness preserved. It is important to tighten the retaining bolt to the specified torque level as failure to do so may result in poor sensor performance and potentially lead to engine damage.

How to replace the knock sensors on a cylinder block on Volvo V70?

The two knock sensors are located on the front-face of the cylinder block below the inlet manifold. Remove the inlet manifold then disconnect the wiring connector to the corresponding knock sensor (front or rear). Next, remove the retaining bolt and remove the sensor. For engines that do not use turbochargers, place the sensor on the cylinder block and replace it, tightening the holding bolt to the required torque while holding the connector of the sensor to the 4 o'clock position. On turbocharged engines, find the sensor on the cylinder block and refit the sensor, tightening the retaining bolt to the specified torque while holding the connector of the front sensor at the 3 o'clock position and the rear sensor connector at the 5 o'clock position. Finally, attach the inlet manifold again.

Genuine Volvo Knock Sensor

Engine Knock Sensor

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Volvo Knock Sensor Part Number: 31441011
$117.06 MSRP: $151.16
You Save: $34.10 (23%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Ignition Knock (Detonation) Sensor; Sensor
- Replaces: 31272945
Fits the following Volvo Models:
- S40 | 2004-2010 | 2.4i, i, T5, T5 R-Design | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- S60 | 2011-2023 | Polestar, Recharge R-Design, T5, T5 Dynamic, T5 Inscription, T5 Inscription Platinum, T5 Inscription Premier, T5 Momentum, T5 Platinum, T5 Premier, T5 Premier Plus, T5 R-Design, T5 R-Design Special Edition, T6, T6 Inscription, T6 Momentum, T6 Platinum, T6 Polestar, T6 Premier Plus, T6 R-Design, T6 R-Design Platinum, T8 Inscription, T8 Polestar, T8 R-Design, T8 Recharge Core, T8 Recharge Inscription, T8 Recharge Plus, T8 Recharge Polestar, T8 Recharge R-Design, T8 Recharge R-Design Expression, T8 Recharge Ultimate | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L GAS
- S60 Cross Country | 2017-2018 | T5 | 4 Cyl 2.0 L GAS
- S80 | 2005-2016 | 2.5T, 2.5T AWD, 3.2, T5, T5 Platinum, T6, T6 Premier, V8 | 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS, 6 Cyl 2.9 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.2 L GAS, 8 Cyl 4.4 L GAS
- S90 | 2017-2023 | B6 Inscription, B6 Momentum, B6 Plus, B6 R-Design, B6 Ultimate, T5 Inscription, T5 Momentum, T6 Inscription, T6 Momentum, T6 R-Design, T8 Inscription, T8 Momentum, T8 R-Design, T8 Recharge Inscription, T8 Recharge R-Design, T8 Recharge Ultimate | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- V50 | 2005-2010 | 2.4i, i | 5 Cyl 2.4 L GAS
- V60 | 2015-2022 | Polestar, T5, T5 Dynamic, T5 Inscription, T5 Momentum, T5 Platinum, T5 Premier, T5 Premier Plus, T5 R-Design, T6 Inscription, T6 Momentum, T6 Polestar, T6 R-Design, T6 R-Design Platinum, T8 Polestar, T8 Recharge Polestar | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 6 Cyl 3.0 L GAS
- V60 Cross Country | 2020-2022, 2017-2018 | T5, T5 Platinum | 4 Cyl 2.0 L GAS
- V70 | 2004-2010 | 2.4, 2.5T, 2.5T AWD, 3.2, R, T5 | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS, 6 Cyl 3.2 L GAS
- V90 | 2018-2021 | T5 Inscription, T5 R-Design, T6 Inscription, T6 R-Design | 4 Cyl 2.0 L GAS
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Volvo Knock Sensor Part Number: 31491865
$117.06 MSRP: $151.16
You Save: $34.10 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Knock Sensor Screw
Fits the following Volvo Models:
- S60 | 2022-2023 | B5 Core, B5 Inscription, B5 Momentum, B5 Plus, B5 R-Design, B5 Ultimate | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- S90 | 2022-2023 | B6 Inscription, B6 Momentum, B6 Plus, B6 R-Design, B6 Ultimate | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- V60 | 2023 | T8 Recharge Polestar | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
- V60 Cross Country | 2023, 2020-2021 | B5 Plus, B5 Ultimate, T5 | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- V90 Cross Country | 2022-2023 | B6, B6 Plus, B6 Ultimate | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- XC40 | 2023 | B4 Plus, B4 Ultimate, B5 Core, B5 Plus, B5 Ultimate | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- XC60 | 2022-2023 | B5 Core, B5 Inscription, B5 Momentum, B5 Plus, B5 R-Design, B5 Ultimate, B6 Inscription, B6 R-Design, B6 Ultimate | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV)
- XC90 | 2023 | B5 Core, B5 Plus, B6 Core, B6 Plus, B6 Ultimate, T8 Recharge Core, T8 Recharge Plus, T8 Recharge Ultimate | 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV)
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Volvo Knock Sensor Part Number: 8653171
$117.06 MSRP: $151.16
You Save: $34.10 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Ignition Knock (Detonation) Sensor
Fits the following Volvo Models:
- C30 | 2008-2013 | T5, T5 R-Design | 5 Cyl 2.5 L GAS
- C70 | 2006-2013 | T5 | 5 Cyl 2.5 L GAS
- S40 | 2004-2011 | 2.4i, i, T5, T5 R-Design | 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- S60 | 2012-2016 | T5, T5 Inscription Platinum, T5 Inscription Premier, T5 Platinum, T5 Premier, T5 Premier Plus | 5 Cyl 2.5 L GAS
- S60 Cross Country | 2016 | T5 Platinum | 5 Cyl 2.5 L GAS
- V50 | 2005-2011 | T5, T5 R-Design | 5 Cyl 2.5 L GAS
- V60 | 2015-2016 | T5, T5 Platinum, T5 Premier, T5 Premier Plus | 5 Cyl 2.5 L GAS
- V60 Cross Country | 2015-2016 | T5, T5 Platinum | 5 Cyl 2.5 L GAS
- XC60 | 2015-2016 | T5, T5 Platinum, T5 Premier | 5 Cyl 2.5 L GAS
- XC70 | 2016 | T5, T5 Platinum, T5 Premier | 5 Cyl 2.5 L GAS
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Volvo Knock Sensor Part Number: 9432570
$117.06 MSRP: $151.16
You Save: $34.10 (23%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Ignition Knock (Detonation) Sensor; Sensor
Fits the following Volvo Models:
- C70 | 1999-2004 | Base | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS
- S60 | 2001-2009 | 2.4, 2.4T, 2.5T, 2.5T AWD, AWD, Base, R, T5 | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- S70 | 1999-2000 | AWD, Base, GLT, GLT SE, T5 | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS
- S80 | 1999-2006 | 2.5T, 2.5T AWD, 2.9, T6, T6 Premier | 5 Cyl 2.5 L GAS, 6 Cyl 2.8 L GAS, 6 Cyl 2.9 L GAS
- V70 | 1999-2007 | 2.4, 2.4T, 2.5T, 2.5T AWD, AWD, Base, GLT, GLT SE, R, R AWD, T5, X/C, X/C AWD, X/C AWD SE | 5 Cyl 2.3 L GAS, 5 Cyl 2.4 L GAS, 5 Cyl 2.5 L GAS
- XC70 | 2003-2007 | Base, Ocean Race, X/C | 5 Cyl 2.5 L GAS
- XC90 | 2003-2006 | 2.5T, Base, T6 | 5 Cyl 2.5 L GAS, 6 Cyl 2.9 L GAS
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Volvo Knock Sensor

The Volvo Knock Sensor protects each engine in the range by detecting knock immediately, and the control unit orders an adjustment of ignition before damage can begin. This smart Volvo Knock Sensor uses a piezoelectric crystal to convert vibration to clear electrical signals, allowing the computer to trim timings in tiny steps and then restore power the instant conditions improve, allowing drivers to enjoy smooth response and solid fuel economy. Because the Knock Sensor reacts within milliseconds, the performance of the sensor remains stable, even during altitude, temperature, or fuel grade changes, prolonging engine life across the entire range. Beyond this vital guardian, Volvo is unique in its commitment to safety and comfort first, with innovations such as the three-point seat belt, strong braking systems, and clean Scandinavian design that make controls simple for anyone to understand. Volvo began in Gothenburg in 1927 and has become a global symbol of reliability, with a strong focus on reliability and forward-thinking ideas such as plug-in hybrids and fully electric powertrains, which reduce emissions while not jeopardizing everyday usability. Every Volvo also enjoys careful attention to ride quality, balanced handling, and instrumentation that provides clear feedback without clutter. By integrating cutting-edge safety heritage with contemporary electrification objectives, Volvo demonstrates how practical engineering and environmental responsibility can travel hand in hand, and the universal Knock Sensor is the perfect fit for that philosophy.

Trust OEM Knock Sensor for quality that holds up. These parts use top-tier materials to keep your ride running smooth. Because they match exact Volvo specs, you get a flawless fit and a hassle-free install every single time. No more fighting with parts that just won't line up. It is easy to search our massive stock of genuine Volvo options at prices you will really like. Every part comes with a real manufacturer's warranty and a simple return policy. Plus, we ship fast to get your order to you. Shop with confidence and give your Volvo the reliability it deserves.

Volvo Knock Sensor Parts and Q&A

Knock Sensor
8653171
Q: Where is the knock sensor located, and How to remove and reinstall it on Volvo S40?
A:
For the 1.8 and 2.0 litre models the knock sensor is mounted on the cylinder block on the front facing side of the intake manifold. Start with removing the intake manifold then from the knock sensor disconnect the wiring connector. It is very important to record the fitted position of the sensor for correct reinstallation. After undoing the retaining bolt remove the sensor. For the 2.4 litre models, you first have to remove the air cleaner assembly and note the fitted positions of the sensors because they need to be fitted again in their original locations. Undo the bolts and remove the sensors in the front of the vehicle to remove the knock sensors and to remove the wiring plugs as the sensors are removed. During reinstallation, make sure you put the sensor/s back in the original locations with the angle of the wiring harness preserved. It is important to tighten the retaining bolt to the specified torque level as failure to do so may result in poor sensor performance and potentially lead to engine damage.
Knock Sensor
31441011
Q: How to replace the knock sensors on a cylinder block on Volvo V70?
A:
The two knock sensors are located on the front-face of the cylinder block below the inlet manifold. Remove the inlet manifold then disconnect the wiring connector to the corresponding knock sensor (front or rear). Next, remove the retaining bolt and remove the sensor. For engines that do not use turbochargers, place the sensor on the cylinder block and replace it, tightening the holding bolt to the required torque while holding the connector of the sensor to the 4 o'clock position. On turbocharged engines, find the sensor on the cylinder block and refit the sensor, tightening the retaining bolt to the specified torque while holding the connector of the front sensor at the 3 o'clock position and the rear sensor connector at the 5 o'clock position. Finally, attach the inlet manifold again.