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P0325 — Knock sensor 1 circuit

What this code generally means, its most common causes, and how serious it is.

TYPE: GENERICSYSTEM: ENGINE SENSORS

What does the code P0325 mean?

The knock sensor detects abnormal vibrations from premature or detonating combustion, letting the control module retard ignition timing to protect the engine. This code signals an electrical problem in that circuit, not necessarily actual knock happening.

Common possible causes

General severity

Moderate — worth checking soon

Without a reliable knock sensor, the control module often defaults to a more conservative ignition setting (less power, sometimes higher fuel use) to protect the engine as a precaution. The car is usually still drivable, but worth checking soon.

This is still a general severity for this code, not a diagnostic for your car. Only a real read of your codes, with your mileage and vehicle history, can tell what's really going on.

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Meca doesn't replace an in-person check by a professional. For any serious sign (a flashing light, a major loss of power, a fuel smell), see a mechanic promptly.

Frequently asked questions

Does this mean my engine is actually knocking?

Not necessarily — this code is about the sensor's electrical circuit, not necessarily an actual knock happening in the engine.

Why does my car feel less powerful?

That's a common effect: without a reliable knock sensor reading, the control module retards timing as a precaution, which reduces available power.

Is it dangerous to keep driving?

Generally not short-term, but it's better not to wait too long, especially if real engine knock is also present.