The engine knock sensor is a piezoceramic sensor in the spark-ignition engine block. The purpose of this sensor is to measure engine noise during its operation (combustion).

The knock sensor records the occurrence of engine knocking, characterized by an increase in pressure and engine noise (knock), from which the name of this phenomenon is derived.

Engine detonation, commonly known as "engine knocking," is a negative phenomenon that occurs during combustion in petrol engines and is acoustically manifested by a knocking sound.

In short, engine detonation is an incorrect fuel mixture combustion at the wrong moment. In this article, we will show how engine knocking manifests and how to prevent it.