Drive with caution — fix soon.
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.
$150 – $500
Varies by vehicle and root cause.
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.
Typically $150 to $500. The sensor is often cheap, but labor can be significant if it sits beneath the intake manifold on your engine.
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.
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.