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On Toyota Yaris, the Knock Sensor acts a significant component given that engine knock is an indication of wrong ignition timing. This device also transmits signals back to the powertrain control module or PCM to allow it to control the ignition timings in a bid to reduce on excess detonation. In most cases, the Yaris uses a knock sensor that works as a piezoelectric which captures vibrations in the form of electrical signals to enable routine monitoring of pressure spikes that are a hall mark of knocking. Much improvement has been made over the years with knock sensors especially with respect to control as the mechanism of controlling the ignition timing individually for each cylinder and management of boost pressure in some engine types. This guarantees the utmost efficiency in terms of work near the actual limit, in combination with the operations to prevent damaging the engine when using lower octane fuel. They have evolved due to increasing focus on the preservation of the engine performance and durability irrespective of the driving style.