Drive with caution — fix soon.
This code means the knock sensor signal is dropping out intermittently rather than failing completely. It usually points to a loose connector, chafed wiring, or a sensor that's beginning to fail. The fix typically involves inspecting and securing the wiring and connector, and replacing the knock sensor if it's the source.
$150 – $500
Varies by vehicle and root cause.
Usually yes, for the time being. The signal drops in and out, so engine protection is occasionally compromised. Have it checked soon since intermittent faults tend to get worse.
Typically $150 to $500. A wiring or connector repair can be on the lower end, while sensor replacement under the intake manifold raises labor costs.
It's moderate. There's no immediate danger, but the intermittent loss of knock protection can lead to engine wear if the fault is left to worsen.
Because the fault is intermittent, the problem may not be present when the car is on the lift. Technicians often wiggle-test the wiring and connectors to reproduce the signal dropout.