OBD-II FAULT CODE
P0331
Knock Sensor 2 Circuit Range/Performance (Bank 2)
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0331.
- Check Engine light
- Poor drivability or reduced fuel economy depending on fault
- Faulty knock sensor
- Wiring fault
- Engine mechanical noise
- Incorrect fuel octane
- Signal out of expected range
- Scan all modules and record freeze-frame data before clearing codes
- Check battery voltage and related fuses
- Inspect sensor wiring and mounting
- Check for engine noise and correct fuel
- Compare live data to expected value and inspect mechanical operation
- Repair wiring, replace sensor if confirmed, address mechanical noise/fuel issue
- Repair mechanical cause, clean/replace sticking actuator, or replace sensor after confirmation
Related Codes
Need more help?
Search manuals, wiring diagrams and technical service bulletins.
Not sure what to do next?
Get step-by-step instructions and professional repair information.
Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.