P0326 — Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
Drive with caution — fix soon.
What P0326 means
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.
Common symptoms
- Check engine light is on
- Slight loss of power or acceleration
- Reduced fuel economy
- Engine pinging or knocking sound under load
- Possible rough running in some cases
Common causes
- Faulty knock sensor
- Damaged or corroded knock sensor wiring
- Loose or poor electrical connection
- Short or open in the sensor circuit
- Engine control module fault
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0326 code?
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.
How much does it cost to fix a P0326 code?
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.
Is a P0326 code serious?
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.
What does the knock sensor actually do?
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.