Faulty knock sensor. Corroded or damaged connector. Wiring fault (open or short). Incorrect sensor torque. Engine mechanical noise triggering false readings.

Which cars are affected by P0325?

P0325 is most commonly reported on Toyota, Nissan, Hyundai, Kia, Subaru vehicles, but can appear on any make.

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P0325

Medium severity

Knock Sensor 1 Circuit Malfunction

The knock sensor is not sending a valid signal to the ECM. This sensor detects engine knock (detonation) so the ECM can retard ignition timing to prevent damage.

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Common causes of P0325

1Faulty knock sensor

2Corroded or damaged connector

3Wiring fault (open or short)

+2 more causes

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Commonly affected vehicles

ToyotaNissanHyundaiKiaSubaru

P0325 can appear on any vehicle — these are the makes where it is most frequently reported.

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Related fault codes

P0171Medium

System Too Lean (Bank 1)

P0300High

Random/Multiple Cylinder Misfire Detected

P0420Medium

Catalyst System Efficiency Below Threshold (Bank 1)

P0172Medium

System Too Rich (Bank 1)