P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor)

Powertrain Severity: Moderate Generic OBD-II

Electrical fault in the knock sensor circuit.

Common causes

  • Faulty knock sensor
  • Wiring damage
  • Loose sensor mounting

Symptoms

  • Check engine light
  • Reduced power because ignition timing is retarded

What to check

  1. Check sensor torque
  2. Inspect wiring
  3. Measure sensor resistance where specified

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0325, follow the service information for that make and model.

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