Tacoma Extra Cab 2WD V6-3.4L (5VZ-FE) (1998)
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Knock Sensor: Description and Operation
The knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it
becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.