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OEM Knock Sensor for 2013-2020 FRS/86 Models.
This sensor is a "microphone" through which the ECU listens for pre-detonation or spark knock that can cause engine damage. If the ECU "hears" detonation, it pulls timing and adds fuel until the detonation goes away, but it does not generate a diagnostic trouble code. Normally, the detonation sensors do not fail unless they are broken or melted as a result of overheating the engine.
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