P0325
Medium SeverityKnock Sensor 1 Circuit (Bank 1)
Ignition System
What Does P0325 Mean?
The knock sensor on bank 1 has a circuit fault. Without it, the ECM cannot detect engine knock (detonation) and must retard ignition timing for safety.
Common Fix
Replace knock sensor
Estimated Cost (DIY)
$20 - $50
Symptoms
- ⚠️Reduced engine power
- ⚠️Poor fuel economy
- ⚠️Slight pinging under load
- ⚠️Check engine light
Common Causes
Failed knock sensorlikely
Corroded sensor connectorpossible
Wiring damagepossible
Sensor not torqued properlypossible
How to Diagnose P0325
- 1Inspect knock sensor connector
- 2Check wiring for damage
- 3Measure sensor resistance
- 4Verify proper torque if recently serviced
Need to read or clear this code?
Shop OBD2 Scanners on Amazon →Frequently Asked Questions
- Can I drive without a knock sensor?
- Yes, but the ECM retards timing for safety, reducing power and fuel economy by 5-10%.
- Where is the knock sensor?
- Usually bolted to the engine block or under the intake manifold. On some engines it is hard to reach.