NGK KNE58-94511 Knock Sensor 94511

【NGK KNE58-94511 Knock Sensor 94511 O2】
■Product Description
Trusted and reliable quality, adopted as original equipment by many car manufacturers.
Stable performance through in-house design and manufacturing.
NTK knock sensors fully incorporate ceramic technology cultivated over many years.

Specifications
【What is a knock sensor?】
A knock sensor is a vibration sensor that detects knocking (a type of abnormal combustion) in the engine, and it is attached to the engine's cylinder block.
When the cylinder block vibrates, the weight inside the knock sensor vibrates, and an electrical charge is generated when force is applied to the piezoelectric element (piezoelectric ceramics). When knocking occurs, the vibration is greater than normal, so a larger amount of electricity is generated.
In this way, the ECU monitors the amount of electricity generated by the knock sensor to detect the presence or absence of knocking.
When pursuing "higher output" and "improved fuel efficiency" in engines, engine designs and conditions tend to make knocking more likely. Therefore, a control system (knock control system) is used to detect and avoid knocking.
The knock sensor is indispensable for this control system.
【Role of the knock sensor】
The timing for igniting the air-fuel mixture is controlled as "ignition timing." While advancing the ignition timing can lead to "higher engine output" and "improved fuel efficiency," it also makes knocking more likely to occur. Conversely, retarding the ignition timing makes knocking less likely, but it reduces engine output and fuel efficiency.
The knock control system generally balances engine output, fuel efficiency, and knocking to control the optimal ignition timing. Detecting knocking is essential for this system, and the knock sensor detects vibrations caused by knocking using a piezoelectric element (piezoelectric ceramics) and transmits them as electrical signals to the ECU.
【What happens if knocking continues?】
Knocking is a type of abnormal combustion that causes abnormally high temperatures and pressures inside the combustion chamber. It is also characterized by metallic "pinging" or "rattling" sounds and vibrations from the engine.
If knocking continues, the abnormally high temperatures and pressures can damage the spark plugs and the engine. For this reason, a control system using a knock sensor is employed to prevent continuous knocking.
If a knock sensor fails, the engine may be damaged because knocking cannot be detected. In such cases, the MIL (Malfunction Indicator Lamp) typically illuminates, and a failsafe (safety control) activates, forcibly retarding the ignition timing. Although knocking will no longer occur due to the retarded ignition timing, engine output and fuel efficiency will decrease. Therefore, if a knock sensor fails, it should be replaced with a new one.
Compatible manufacturers: Subaru / Daihatsu / Toyota
Genuine Part Number: 89615-20090

■Notes on Images
※Images are for illustration purposes only. They may include products of different sizes or colors. Product design and specifications are subject to change without notice. Please understand.

■Precautions
Always stop the engine before inspection, replacement, or adjustment.
Perform inspection and replacement according to the service manual of each car manufacturer.
Please use the knock sensor with the correct part number as stated in this document.
It may not function properly if used in modified vehicles, etc.
Please be careful as dropping the knock sensor or subjecting it to impact may cause damage such as cracks or broken connectors.
If foreign matter such as oil or mud adheres to the cylinder block surface where the knock sensor is to be installed, remove it before installing the knock sensor.
Follow the service manual of each car manufacturer for the knock sensor's tightening torque, mounting bolt, and connector orientation.
Do not allow the knock sensor to come into contact with the exhaust manifold or other high-temperature parts.
When mating the knock sensor to the vehicle side harness, ensure that there is no water, mud, or other foreign matter inside the connector on both the sensor side and the harness side before mating.
Depending on the condition of your vehicle, replacing the knock sensor alone may not resolve the problem.
When the MIL illuminates, before (or after) replacing the knock sensor, always clear (reset) the diagnostic (self-diagnosis/OBD) error codes according to the service manual of each car manufacturer. Failure to clear the error codes may lead to problems such as the MIL not turning off.