Skip to content

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)(3)

Reviewed1 source
1 source

What P0328 means

Severity not yet assessed

The control unit reports “Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)(3)”. Code P0328 identifies the area to investigate, but it does not prove that one named part has failed without a confirming test and vehicle context.

Driveability assessment not yet available. Get a personalized AI Second Opinion for your exact car.

General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

For a code naming the knock sensor circuit for sensor one, bank one, read it alongside the conditions it appeared under before deciding anything.

What this code does not prove

A code naming the knock sensor circuit for sensor one, bank one reports what the control unit observed, not which part caused it. More than one cause can trigger the same code, so testing has to separate them.

Where the diagnosis usually goes next

Check the signal at its source

The knock sensor circuit for sensor one, bank one is what code P0328 is reporting on — specifically, the signal reads at or near the top of its expected electrical range. This points to an area, not a confirmed cause.

How to tell the paths apart: Read the live data and compare it against the expected range for current conditions before replacing anything.

Rule out wiring and the connector

Codes of this shape often come from damaged wiring, a corroded connector, or a poor ground on the knock sensor circuit — not the component itself.

How to tell the paths apart: Inspect the wiring and connector for the knock sensor circuit for damage and a secure ground before replacing anything.

Before you drive on

By itself, a code naming the knock sensor circuit for sensor one, bank one does not settle whether this specific car is safe to keep driving. Normal behaviour means limited use for diagnosis only; any change resets that decision.

Stop and arrange a check if

  • the engine is misfiring, losing power, or stalling
  • smoke, a fuel/burning smell, or overheating appears
  • the knock sensor circuit for sensor one, bank one's behaviour is clearly getting worse rather than staying stable

Before authorising a repair

  • Bring the complete code list and freeze-frame data relevant to the knock sensor circuit
  • Ask for the test that confirms a fault in the knock sensor circuit — not just the code alone

What to check first

  1. Pull up live data on the knock sensor circuit for sensor one, bank one and see how it compares with the range expected for the current conditions.
  2. Inspect the wiring, connector, and ground for the knock sensor circuit before replacing the component.
  3. A knock sensor circuit should produce a clean, low-amplitude signal at idle that spikes distinctly and repeatably when the engine is deliberately made to knock (e.g. under load with reduced octane or advanced timing) or tapped near the sensor with the engine off. A circuit with no response to a controlled knock event, or one that reads noisy at all times, points to the sensor, its mounting torque, or its wiring rather than actual engine knock — a controlled tap test is the standard bench check.
Cost data coming soonUpload your estimate to check if the price is fair

Frequently asked questions

Does this code tell me the knock sensor circuit has failed?

No. It points to the knock sensor circuit for sensor one, bank one; the cause still needs to be confirmed by a measurement or targeted test.

What should I bring to the workshop?

The complete code list, freeze-frame data, and the conditions around the knock sensor circuit for sensor one, bank one — that gives the technician context, not a guess.

Was this page helpful?