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The sensor is bad.

A properly-functioning knock sensor allows the ECM to advance timing until it senses a knock. It then retards timing until the knock just barely goes away allowing for optimal gas mileage.

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Q: Does a knock sensor ECM error mean that sensor is bad or that the sensor is just reporting a knock in the engine?
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Does the engine on a 2003 impala knock in the top of the motor if the knock sensor is bad?

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