Knock sensor 1 signal voltage is too high (open circuit / short to power).
SYMPTOMS
- Check-engine light
- Reduced power
- Retarded timing
- Worse economy
LIKELY CAUSES
- Defective knock sensor
- Open wiring
- Short to power
- Loose mounting
DIAGNOSIS STEPS
- Check wiring for open/short to power
- Inspect sensor mounting torque
- Test or replace the sensor
RELATED PARTS
- Knock sensor
- Harness