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IgnitionSeverity Medium: diagnose soon

P0328Knock Sensor 1 Circuit High (Bank 1 or Single Sensor)

What it means

The knock sensor 1 signal or circuit voltage is too high, usually an open circuit, a short to voltage, or real mechanical noise from the engine.

Symptoms

  • Check engine light
  • Reduced power (ignition retarded as a precaution)
  • Higher fuel consumption

Common causes

  • Open or shorted sensor wiring (often under the intake manifold)
  • Corroded connector
  • Failed knock sensor
  • Shield or ground fault

What to check first

  1. Measure the sensor resistance and insulation to ground
  2. Scope the signal while tapping the block near the sensor
  3. Inspect the harness, especially under the intake manifold
Can I drive with P0328? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

How to test the parts behind P0328

Knock sensorWiring, typical values, multimeter and scope tests

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P0328: questions and answers

What does P0328 mean?

P0328: Knock Sensor 1 Circuit High (Bank 1 or Single Sensor). The knock sensor 1 signal or circuit voltage is too high, usually an open circuit, a short to voltage, or real mechanical noise from the engine.

What are the symptoms of P0328?

Check engine light. Reduced power (ignition retarded as a precaution). Higher fuel consumption.

What causes P0328?

Open or shorted sensor wiring (often under the intake manifold). Corroded connector. Failed knock sensor. Shield or ground fault.

How do you diagnose P0328?

1. Measure the sensor resistance and insulation to ground 2. Scope the signal while tapping the block near the sensor 3. Inspect the harness, especially under the intake manifold

Can I drive with P0328?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.