What the OBD-II code p0325 means

Fault code P0325 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P0325 – Knock Sensor 1 Circuit Malfunction (Bank 1)
P0325
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P0325: causes, symptoms and repairs

The meaning of fault code P0325

DTC P0325 generally means that knock sensor 1 on cylinder bank 1 is malfunctioning. This device is used to detect when the engine is knocking, and thereby delivering less power. This code is triggered when the car's ECUdoesnt receive a signal from the sensor or there is something wrong with the sensor readings. In order to identify this fault, the engine should be running at the right operating temperature and at a speed between 1,600 and 5,000 rpm.

Common causes

  • The knock sensor could be defective due to damage to or leaks in the housing, extreme temperatures, vibrations, and so on. This is arguably the most common cause of the fault.
  • The connection could be affected by a loose cable or electromagnetic interference. Interference occurs when the device is installed too close to high-voltage ignition components.
  • A wiring fault such as a short. This can occur due to mechanical, thermal or chemical damage, resulting in cracks, deformation, melting or fraying. The circuit may also be affected by corrosion.
  • An error could also be caused by a loose fastener or improper installation. The device should be securely attached to the power unit.
Possible symptoms

  • Activation of the check engine light
  • A loss of power
  • Engine hesitation
  • Reduced acceleration
  • A decrease in fuel efficiency
  • Strange noises coming from the engine compartment during acceleration
  • Knocking
Recommended repairs

  • Connect an OBD2 scan tool to the vehicle via the data link connector and check whether any other diagnostic codes are present. This should help you to identify any underlying problems. Similar DTCs include P0327 and P0328, referring to the voltage output.
  • Measure the resistance of the knock sensor using a multimeter and compare this to the factory specifications. This should be indicated in the vehicles repair manual. If the readings are abnormal or there are visible signs of damage, you may need to replace the device. Check whether the sensor has been installed properly, it may need to be reattached or fastened.
  • Make sure this issue isnt being caused by a wiring fault. Replace the wires or cables connected to the component if they are frayed or melted. Corroded contacts should be cleaned and treated with specialised products.
  • If you decide to replace the knock component, it is also recommended to replace the knock harness at the same time.
Frequently Asked Questions (FAQ)

What does the code “P0325” mean?


It indicates that there is a problem with the knock sensor’s (1, bank1) circuit, causing it to malfunction.

What causes it to appear?


This usually happens when there is a fault with the sensor itself, the wires or connection. Problems can also arise when it is not installed correctly or components are loose.

How do I get rid of this DTC?


You can clear the error by disconnecting the negative battery terminal for 15 minutes or by erasing it from the onboard computer’s memory archive. However, the device should be fixed before the DTCs are reset to stop them from reappearing.

Can I still drive my car?


Yes, this fault is not associated with any major safety risks. However, it is still advisable to get the vehicle checked and repaired to prevent further, costlier damages.

How much does it cost to fix a “P0325” fault?


This will largely depend on the work required, the make and model of the vehicle, and the provider of the repair services. DIY repairs are always cheaper as the labour costs are not included, however, there is always the risk that errors will be made due to a lack of experience. You can buy aftermarket knock sensorsfor less than 100 online.

Fault code P0325 - Knock Sensor 1 Circuit Malfunction (Bank 1) can occur with any car but is most often found on the following cars:

  • Honda: Accord, Civic
  • Ford: Fiesta, Focus
  • Hyundai
  • Lexus: RX300
  • Renault: Clio
  • Toyota: Corolla, Camry

If you get the code P0325 on your car, make sure that the diagnostics are carried out correctly and the error is still relevant. Check for symptoms associated with the problem and explore options for resolving it.

What to do if the fault code p 0325 appears

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