Drive with caution — fix soon.
This code means the computer detected a problem in the knock sensor circuit, which listens for engine pinging or detonation. It usually points to a failing knock sensor, damaged wiring, or a loose connector. The fix typically involves cleaning or replacing the knock sensor and checking its wiring and connector.
$150 – $500
Varies by vehicle and root cause.
Usually yes, for short distances. The car will run, but the computer may reduce timing to protect the engine, costing you some power and fuel economy. Avoid hard acceleration and get it diagnosed soon.
Most repairs run from $150 to $500. The sensor itself is often inexpensive, but on many engines it sits under the intake manifold, which raises labor costs.
It's moderate. The car isn't in immediate danger, but a non-working knock sensor means the engine isn't protected from detonation, which can cause damage over time if ignored.
It listens for engine detonation or pinging and tells the computer to adjust ignition timing. This protects the engine from damaging knock, especially under load or with lower-octane fuel.