The knock sensor signal is below the expected range. The driver may notice weak power or higher consumption.
Likely causes, most common first
- Open or shorted wiring
- Faulty knock sensor
- Loose sensor mounting
- Corroded connector
Parts usually involved
- Knock sensor
- Sensor connector
- Wiring harness
Test before you replace
Check the wiring, connector and mounting torque before fitting a new sensor.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.