P0327 — Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
Drive with caution — fix soon.
What P0327 means
This code means the knock sensor signal is present but reading too low or outside its normal operating range. It often points to a deteriorating knock sensor, wiring resistance, or a loose connector affecting the signal. The fix usually involves testing and replacing the knock sensor and inspecting its wiring and ground.
Common symptoms
- Check engine light is on
- Slight reduction in power
- Lower fuel economy
- Occasional engine pinging under load
- Generally normal-feeling driving otherwise
Common causes
- Worn or deteriorating knock sensor
- High resistance in the sensor wiring
- Loose or corroded connector
- Poor sensor mounting or ground
- Engine control module signal fault
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0327 code?
Usually yes, for the short term. The car runs but the engine may not be fully protected from detonation. Avoid heavy acceleration and have it diagnosed within a week or so.
How much does it cost to fix a P0327 code?
Typically $150 to $500. The sensor is often cheap, but labor can be significant if it sits beneath the intake manifold on your engine.
Is a P0327 code serious?
It's moderate. There's no immediate breakdown risk, but a weak knock sensor signal means reduced engine protection, which can lead to wear if left unaddressed.
What causes a low knock sensor reading?
Common causes are a deteriorating sensor, corroded wiring, or a poor ground connection. Sometimes a loose sensor mounting bolt also weakens the signal it sends.