Knock sensor symptoms What does a knock sensor do? A knock sensor detects knock caused by detonation, pre-ignition, or engine mechanical problems. A knock sensor doesn’t cause any of these problems; its only job is to detect vibration caused by the pre-ignition, detonation, or mechanical problem and create a voltage that is read by the ECM. An engine knocking sound will cause vibration which is picked up by the knock sensor and reported to the ECM. If the voltage exceeds pre-determined levels, it will set one of the knock sensor … Read More
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