P0325: Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
System: Ignition / knock control · Priority: medium
What P0325 means
The control module detected a condition matching the generic definition Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor). A trouble code identifies what the module detected; it does not automatically identify the failed part.
Useful next checks
- Inspect knock-sensor wiring and connector.
- Check for mechanical noise that could confuse diagnosis.
- Use manufacturer service information for sensor resistance and access procedure.
Why vehicle context matters
The same generic code can have different diagnostic paths depending on engine, calibration, wiring layout, service bulletins and related codes. Freeze-frame and live data can help establish when the fault occurred.
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