P0328 Knock Sensor 1 Circuit High (Bank 1 or Single Sensor)
Knock sensor signal is too high.
Common causes
- Shorted wiring
- Faulty sensor
- Real mechanical noise
Symptoms
- Check engine light
- Reduced power
What to check
- Inspect wiring
- Listen for mechanical knocking
- Replace sensor if faulty
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0328, follow the service information for that make and model.