All codes › P0325

P0325 — Knock Sensor 1 Circuit Fault

P0325 is set when the engine control module does not receive a valid signal from the Bank 1 knock sensor — or the only knock sensor on engines that use one. The knock sensor is a piezoelectric vibration sensor that listens for the characteristic frequency of pre-ignition (detonation) so the ECM can pull timing to protect the engine. With no usable knock signal, the ECM defaults to conservative timing maps, which reduces power and fuel economy.

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