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P0326 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


P0326 is a Diagnostic Trouble Code (DTC) within the On-Board Diagnostics II (OBD-II) system used in modern vehicles. This code specifically relates to a problem with the Knock Sensor Range/Performance (Bank 1).


The knock sensor’s range or performance in Bank 1 had been discovered to be problematic by the engine control module (ECM), according to the P0326 code. Engine banging or pinging, which may signify aberrant combustion, is picked up by the knock sensor. The knock sensor is not operating within the required settings when the ECM detects a range or performance issue, which might result in issues with engine performance.


Several factors can trigger the P0326 code, including:

  • Faulty Knock Sensor: A malfunctioning or damaged knock sensor can lead to inaccurate readings, causing the code.
  • Wiring Issues: Damaged or corroded wiring in the knock sensor circuit can result in poor electrical connections.
  • Loose or Corroded Connectors: Loose or corroded electrical connectors in the knock sensor circuit can disrupt the signal.
  • Engine Mechanical Problems: Engine issues, such as excessive carbon buildup or incorrect spark plug gaps, can cause false knock sensor readings.
  • Faulty ECM: In rare cases, a malfunctioning engine control module can produce erroneous P0326 codes.


One or more of the following may be among the P0326 code symptoms:

  • Decreased engine power and performance.
  • Illumination of the dashboard’s Check Engine Light (CEL).
  • Possible engine pinging or banging sounds.
  • Fuel economy dropped.


To diagnose and confirm a P0326 code, a mechanic or technician will typically perform the following steps:

  • Use an OBD-II scanner to retrieve the trouble codes and freeze frame data.
  • Inspect the knock sensor and its wiring for physical damage or corrosion.
  • Check for loose or disconnected electrical connectors in the knock sensor circuit.
  • Test the knock sensor’s resistance and voltage output.
  • Inspect the engine for mechanical issues that could cause false knock sensor readings.
  • If necessary, test the ECM for faults using specialized diagnostic equipment.

Common mistakes

  • When handling a P0326 code, common errors include:
  • Replacing the knock sensor without first examining the connectors or wiring.
  • Ignoring probable banging engine reasons including carbon buildup or spark plug issues.
  • Unable to restart the car after repairs and clear the error code.

How serious is this?

Although a P0326 code may not cause urgent engine damage, it is to be taken into account. If a knocking or ping occurs, failure to follow the code can lead to a reduction in engine performance, a decrease in fuel efficiency, and possible damage for an extended period. The timely resolution of this issue is recommended.

What repairs can fix the codeS?

repair manuals

Repairs to address a P0326 code may include:

  • Replacing the Knock Sensor: If the knock sensor is found to be faulty, it should be replaced with a new one.
  • Repairing or Replacing Wiring: If damaged or corroded wiring is identified, it should be repaired or replaced.
  • Addressing Engine Mechanical Issues: If engine mechanical problems are causing false knock sensor readings, they should be resolved.
  • Testing and Potentially Replacing the ECM: If all other possibilities are ruled out, testing and potentially replacing the engine control module may be necessary.

Related codes

Codes related to P0326 may include:

  • P0325: Knock Sensor Circuit Malfunction
  • P0324: Knock Control System Error (Circuit Range/Performance)


An issue with the Knock Sensor Range/Performance (Bank 1) is related to the DTC number P0326. It means that the engine control module has identified a knock sensor range or performance issue, which might result in engine performance issues. To stop more damage and improve the performance of the vehicle, prompt diagnosis and repair are crucial. It’s best to deal with this code as soon as you can because ignoring it might result in decreased fuel economy and probable engine damage.

P0326 Code – What Does It Mean & How To Fix It