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A knock sensor detects vibration associated with engine knocking and sends a signal to the engine control unit (ECU), which can adjust ignition timing in response. This helps control sustained knock, a form of abnormal combustion that can damage engine components. The sensor is part of the engine-management system—not a cure for unsuitable fuel or an underlying engine fault.
What does a knock sensor do?
A knock sensor is typically mounted on the engine block or crankcase. In the Bosch designs described in its knock sensor overview and technical datasheet, a piezoelectric element detects structure-borne vibration and converts it into an electrical signal for the engine controller. Knocking produces characteristic higher-frequency vibration that the control system can distinguish from ordinary engine noise.
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The ECU, engine control module (ECM), or powertrain control module (PCM) may use the signal to retard ignition timing. The precise control strategy varies by vehicle. For example, a 2013 Hyundai Motor America technical bulletin describes reducing timing advance until knock stops, then continuing to adjust timing to balance engine operation. That is an example for the bulletin’s specified context, not a universal description of every vehicle.
Why is knock control important?
Sustained knocking is associated with combustion occurring in a damaging way. Bosch identifies the cylinder-head gasket and cylinder head among components that sustained knocking can damage. A working knock-control system gives the controller information it can use to respond; it does not remove the underlying cause if, for example, the fuel is unsuitable or the engine has a fault.
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- 【Applicability】Compatible with Lexus 2004-2006 ES330,2006 GS300, 2007 GS350, 2006-2007 IS250, 2006-2007 IS350, 2004-2006 RX330, Compatible with Scion tC 2010-2012
- 【Applicability】Compatible with Toyota 2004-2009 4Runner, 2005-2011 Avalon, 2002-2011 Camry, 2003-2012 Corolla, 2007-2012 FJ Cruiser, 2005-2012 Highlander, 2003-2012 Matrix, 2006-2011 RAV4, 2004-2012 Sienna, 2004-2008 Solara, 2005-2011 Tacoma, 2009-2011 Tundra, 2009-2011 Venza. Fits 4‑cylinder & V6 engines ONLY. NOT for V8 / Hybrid engines
- 【Part Number】Replaces 89615-06010 89615-20090 89615-B6010.pls check the part components number whether match
- 【Note】Please check your part pictures with our pictures, it must be completely same. Or it will not fit your car. It will save your time and cost
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Bosch stated in 2016 that engines with knock control can achieve up to 9% fuel savings and a 5% torque increase. These are manufacturer-published potential benefits, not guaranteed real-world results for every engine—and not a promise that replacing a sensor will produce those gains.
How can you tell if the knock sensor is bad?
A knock-sensor-related warning or diagnostic trouble code is a reason to investigate, but it does not prove the sensor itself has failed. Diagnosis may need to cover the sensor, its wiring and connectors, its mounting, and conditions that can cause knock. Bosch Diagnostics describes scan tools as a source of vehicle diagnostic information; some vehicle-specific procedures also use an oscilloscope to examine the sensor signal.
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- One year warranty time. You could get a quick and easy refund or replacement if you meet any problem with the part in the warranty time.Please contact us without hesitation.
- Product:Stable performance;Durable and long-lasting life; All tested before shipment;Box Packaging Type;Made of high quality material;Meet OEM standards and specifications;High grade technology,Easy installation and No need special tool.
- Advantage: :Improve vehicle performance;eliminates failure light codes;designed to be direct replacements and does not require calibration or programming or modification.
- Installation Step:1.Diagnostic the trouble code to identify the faulty part ;2.Remove it from wiring connector;3.Reinstall the new part;4 Clear the trouble codes.
- Notice: Carefully check fitment, list description, part pictures and part no., must make sure they all fit your vehicle
Test methods, resistance values, removal steps, and tightening specifications depend on the vehicle. The Hyundai bulletin demonstrates signal testing in its own service context and stresses that correct tightening torque matters for knock detection. Follow the vehicle’s service information rather than applying a procedure or specification from another model.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you drive with a bad knock sensor?
The available technical information establishes that sustained knock can damage engine components, but it does not provide a universal safe-driving rule for every sensor fault or vehicle. A fault code alone does not establish whether the engine is knocking or whether the sensor, circuit, or another issue is responsible. If you suspect active knocking or notice a warning, have the vehicle assessed promptly and follow its owner’s manual guidance; avoid assuming that the knock-control system can compensate indefinitely.
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- Reference Numbers: 12623095; KS437
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Rank #3
- HELPS DETECT ENGINE KNOCK – Delphi Ignition Knock Sensors detect engine knock caused by pre-ignition or detonation, providing accurate signals to the engine control module to help optimize ignition timing, support efficient combustion, and help protect against potential engine damage.
- ACCURATE KNOCK DETECTION ACROSS OPERATING CONDITIONS – Engineered with calibration across a wide range of frequencies to detect changes in combustion events, helping deliver precise knock sensor signals that support consistent engine performance with a variety of fuel types and driving conditions.
- VERSATILE OE-ENGINEERED DESIGN – Flat frequency response enables the same knock sensor design to be used across multiple engine applications while maintaining reliable detection of knock frequencies beyond the primary operating range for dependable engine management.
- RELIABLE SIGNAL INTEGRITY – Features a ground-isolated design with a 2-wire shielded harness to help reduce electromagnetic interference (EMI) for dependable signal transmission, while the self-generating piezoelectric sensing element requires no external power to produce accurate knock sensor output.
- Delphi products purchased through, from, or on Amazon do not qualify for Delphi’s standard LIMITED warranty. When purchased through, from, or on Amazon, any warranty on this product is offered by and is the sole responsibility of the seller identified on the shipment details of your order. Please review all warranties carefully and contact the identified seller for all warranty details and claims.
What to check before replacing a knock sensor
- Confirm the diagnosis: Use vehicle-specific service information to assess the code and inspect the sensor circuit and possible causes of knock.
- Verify fitment: Knock sensors are vehicle-specific. Check the exact application and part number against your vehicle. Bosch provides a replacement-sensor listing and vehicle-fitment lookup; availability and listings may change.
- Use the correct procedure: Consult the vehicle’s service information for installation steps and the tightening specification. Incorrect torque can affect knock detection.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
