The computer sees a fault in the knock sensor circuit. The driver may notice weak power or higher consumption since ignition timing may be reduced.
Causes vary by car. Test before you order a part.
Likely causes, most common first
- Damaged wiring or connector
- Faulty knock sensor
- Loose sensor mounting
- Corroded connector
Parts usually involved
- Knock sensor Find at suppliers
- Sensor connector Find at suppliers
- Wiring harness Find at suppliers
Test before you replace
Check the wiring and sensor tightening torque, then test the sensor signal.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.