What is the function of a knock sensor, and how does it interact with engine timing control?

What is the function of a knock sensor, and how does it interact with engine timing control?

• A. Detects engine knock and signals ECU to retard timing; a faulty sensor may fail to retard timing causing knocking or reduced power
• B. Measures oil pressure
• C. Controls idle speed
• D. Regulates fuel rail pressure

Answer: (B)