OBD-II Trouble Codes

P0325 Code: Knock Sensor Malfunction (Sensor 1, Bank 1)

Reading Time: 3 minutes

The P0325 code indicates a possible problem with your engine’s knock sensor. What exactly does it mean if your car registers this code on an OBD-II scanner and what can you do about it? Read on to find out.

What Does the P0325 Code Stand For?

Diagnostic trouble code (DTC) P0325 stands for Knock Sensor Malfunction (Sensor 1, Bank 1). The code indicates your car’s primary computer, which is often referred to as the powertrain control module (PCM), perceives a problem with the knock sensor or its circuit.

obd code scanner
Code P0325 means that your car computer detects a problem with the knock sensor unit or its circuit.

Before we discuss any further you might be wondering, what exactly does a knock sensor (KS) do? Installed inside the engine, the knock sensor detects the vibrations from abnormal combustion, known as spark knock. The PCM uses the signal from the knock sensor to retard ignition timing, thereby reducing spark knock and limiting its damaging effects.

A car can have one or two knock sensors depending on its make and model.

Code P0325 sets when the PCM determines the knock sensor signal falls outside of a predetermined threshold for a certain amount of time. The ‘Bank 1’ portion of the code indicates that the issue pertains to the knock sensor on the side of the engine that houses the number one cylinder.

What are the Possible Causes of the P0325 Code?

Before we dive into the symptoms that signal a P0325 error, you should first know the factors that could cause it. Listed below are the most common culprits:

dash gauge showing low fuel
One of the common symptoms of Code P0325 is excessive fuel consumption.

What are the Common Symptoms of the P0325 Code?

OBD-II code P0325 will typically be accompanied by one or more of the following symptoms:

How to Diagnose the P0325 Code

There many different vehicular issues that could trigger code P0325. To make things even more complicated, the diagnostic procedure will vary by vehicle.

Here are a couple of videos to give you an idea of the troubleshooting process:

How to Fix the P0325 Code

If you’re looking for a quick, one-size-fits-all solution to the P0325 code, you won’t find any. As with all OBD-II codes, there are lots of possible causes—all of which have different fixes.

And remember—all vehicles are different. When troubleshooting and repairing diagnostic trouble codes, make sure to consult the factory repair information for your application. Different automotive manufacturers will have different instructions on how to fix the root cause of these trouble codes.

You’ll need to diagnose the code accurately, as shown in the videos above, to find out the underlying cause and perform any necessary repairs. You can also consult other guides and manuals that are specific to the trouble code and your vehicle.

Other Notes About P0325

Can you drive with a P0325 code? Technically, you can, if you absolutely have to—but you shouldn’t. Driving with the P0325 error code set for a prolonged period of time can potentially cause major engine damage. Be sure to address the issue right away.

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