Is it safe to drive with this code?

Driving for a short distance to a safe location is typically possible, but continued use is not recommended—the ECU may retard ignition timing to protect the engine, which can reduce power and fuel economy, and prolonged operation may lead to increased engine wear or damage; refer to our disclaimer for further guidance.

P0328 may affect your MOT result if the malfunction indicator lamp (engine warning light) is illuminated at the time of the test, as this is classed as a major defect under current MOT rules; see our disclaimer for complete information.

Roughly how much does it cost to fix?

Repair costs vary widely depending on vehicle design and whether the issue lies with the sensor, wiring, or ECU—sensor replacement alone can fall within the low three-figure range if access is straightforward, but vehicles requiring inlet manifold removal (common on V-engines) may reach the mid or high three-figure range due to increased labour and gasket replacement; main dealer rates will generally be higher than independent garages.

Can I just replace the sensor without further testing?

Replacing the sensor without proper diagnosis can be a costly mistake—P0328 often indicates a wiring or connector fault rather than sensor failure, and some cases stem from ECU input circuit issues; checking the circuit first can save both time and money.

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← All fault codes | Electrical & Sensors

P0328

Powertrain

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

The engine control unit has detected that the voltage signal from the knock sensor on Bank 1 is reading higher than the expected range, typically indicating a circuit or sensor fault rather than actual engine knock.

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ⓘ Information only. This page provides general educational information about fault code P0328. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.

Recommended next steps

Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.

What does P0328 mean?

P0328 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor).

This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

About Electrical & Sensors codes

Codes in the Electrical & Sensors category.

P0328 is one of 4,010 codes in this category. Browse all Electrical & Sensors codes →

What we know about P0328 specifically

We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for P0328.

Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:

•your vehicle's own service manual or manufacturer-specific technical bulletins
•a qualified mechanic with a manufacturer-level diagnostic tool
•a marque specialist familiar with your make and model

Codes nearby

Codes adjacent to P0328 in the P-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

P0325 Knock Sensor 1 Circuit Malfunction (Bank 1)

P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1)

P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0329 Knock Sensor Circuit Intermittent (Bank 1)

P032A Knock Sensor 3 Circuit Malfunction (Bank 1)

P032B Knock Sensor 3 Circuit Range/Performance (Bank 1)

Other Electrical & Sensors codes

Other fault codes in the same system as P0328. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.

B1257

Air Temperature External Sensor Circuit Short To Ground Detailed guide

B1363

DBPT Circuit Short To Ground Detailed guide

B2100

Ignition Run/Start Input Circuit Performance Detailed guide

C2000

Steering Angle Sensor Not Calibrated Detailed guide

P0030

HO2S Heater Control Circuit (Bank 1 Sensor 1) Detailed guide

P0031

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1) Detailed guide

Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with P0328 can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.

Information only, not professional advice

The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →

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