Engine and gearbox (P)
P0327: Knock Sensor Low Input
The knock sensor is detecting a signal that is lower than expected. This may affect the engine's ability to adjust timing properly.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Engine knocking noise
- Reduced fuel efficiency
- Poor acceleration
- Check engine light on
Common causes
- Faulty knock sensor
- Wiring or connector issues
- Improper sensor installation
- Engine detonation
How to check it yourself
- Inspect knock sensor wiring and connectors
- Ensure proper sensor mounting and torque
- Check for signs of engine detonation
- Test the knock sensor with a multimeter
Can I keep driving?
The car can still be driven, but prolonged driving may cause engine damage if knocking occurs.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer