Q: Knock sensor

Hi There, The knock sensor is a component that creates an internal voltage signal based upon vibrations it detects as a result of detonation internally in the motor which creates a knocking vibration. An engine can ping (or knock) due to an improper combustion process. A "spark knock" is the result of combustion occurring too early. Early combustion can occur from carbon buildup inside the combustion chamber, a lean air/fuel mixture, and advanced ignition timing (spark plug firing too soon). This may be caused for many different reasons and will generally result in a check engine light which will store a specific engine diagnostic code in the computer. This will be helpful in determining what specifically may be causing the knock sensor to pick up these vibrations. I would suggest having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.