What is a "anti-knock" sensor or module?
The sensor helps to monitor the engine performace, and when it detects knock or pinging. It sends a signal to the PCM which in turn adjusts the timing and fuel ratio to reduce or eliminate it in those situations you have knocking. Low octane, bad gas, carbon deposits and heat will contribute to pinging. It's best to replace the sensor if you know it is faulty to avoid damage to the engine.
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