Knock Sensor 1 Circuit High Input (Bank 1)
The knock sensor signal voltage is above the expected range. Often caused by a sensor producing excess output due to mechanical noise (loose mounting, accessory drive vibration) rather than a sensor fault.
Affected components
- Knock sensor
- Knock sensor wiring
Common causes
- Medium likelihood: Mechanical noise picked up by sensor (loose accessory)
- Medium likelihood: Signal wire shorted to supply voltage
- Low likelihood: Sensor failed
Possible symptoms
- Check engine light on
- Power loss from defensive spark retard
- Increased fuel consumption
- Possible audible pinging under load
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.