P0325 OBD-II Trouble Code: Knock Sensor Malfunction (Sensor 1, Bank 1)

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Cost of diagnosing the P0325 code

P0325 is a diagnostic trouble code (DTC) for "Knock Sensor Malfunction (Sensor 1, Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
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P0325 code definition

Knock Sensor Malfunction (Sensor 1, Bank 1)

What the P0325 code means

P0325 is a general ODB2 diagnostic trouble code associated with the knock sensor circuit. This code may be seen with other knock sensor codes and lean condition codes.

P0325 means that there is a malfunction within the knock sensor 1 in circuit bank 1. This malfunction will be detected by the ECU when it does not receive the proper information from the knock sensor. This triggers a Check Engine Light to be illuminated on the dashboard.

What causes the P0325 code?

  • A failed ECU
  • A failed knock sensor
  • Open or short in the wiring harness
  • Electrical connection issues

What are the symptoms of the P0325 code?

  • The Check Engine Light illuminating on is normally the most noticeable symptom.
  • The engine may have a slight lack of power.
  • There may be no felt symptoms with P0325.

How does a mechanic diagnose the P0325 code?

  • Uses a scan tool to check for any codes, there may be history, pending and current codes

  • Notes the freeze frame data for each of these codes this will show the conditions the vehicle was under when the code was set such as engine RPM, coolant temp, run time, and vehicle speed

  • Clears the code to have a fresh start to diagnosis

  • Performs a road test to try to get the Check Engine Light to come back on and confirm the issue is present

  • Uses a scan tool to check for proper knock sensor operation while the engine is revved

  • Checks the resistance of the knock sensor

  • Tests the ECU test following the manufacturer's testing procedures if needed.

Common mistakes when diagnosing the P0325 code

With any code, even the most experienced technician can make simple mistakes and overlook the basics if they do not follow all of the diagnostic steps or do not complete them in order.

How serious is the P0325 code?

P0325 is generally not a serious code and should be able to be driven without issue to a safe location once the malfunction occurs. Some vehicles may experience a slight lack of engine power as the ECU will retard timing to prevent damage in case the engine was knocking.

What repairs can fix the P0325 code?

  • Replacing the ECU
  • Repairing or replacing the wiring harness
  • Replacing a faulty knock sensor
  • Repairing an electrical connection

Additional comments for consideration regarding the P0325 code

A scan tool that does more than just check codes will be needed for performing accurate diagnosis of P0325. Many of the items that are checked can be done much faster and more accurately with the live data stream these scan tools allow access to.

Need help with a P0325 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

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Rodrigo

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10 years of experience
He was on time and prepared for work right off. He allowed my husband to tinker with him and together they fixed the problem (so far-requires several days of driving to verify)..friendly and courteous, and the price was right. Thanks your mechanic!
2002 MITSUBISHI ECLIPSE - CHECK ENGINE LIGHT IS ON - HENDERSON, NEVADA

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1996 VOLVO 850 - CHECK ENGINE LIGHT IS ON - CONYERS, GEORGIA

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17 years of experience
Great Guy, very experienced.
2008 MERCEDES-BENZ GL450 - CHECK ENGINE LIGHT IS ON - PARAMOUNT, CALIFORNIA

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Tried this service for the first time. My problem - sometimes my auto's engine would race, the tachometer would be very high but my car would start slowing down, as if it had lost power, but after a short time the normal power and speed would be working right again. Very scary when you are driving on the highway at 70 mph. then this happens, and you seem to be coasting down to 30 mph. before your car starts to engage properly again. Pete Hambly to the rescue. I explained to Pete how my car was acting, and he surmised what the problem was very quickly before he even hooked up the code reader to my auto. After reading the code and doing a few tests with his instruments to verify his prognosis, he solved the problem. He looked at my part and found a faulty connector sensor. He temporally fixed the problem until the part I need is found. Pete was friendly, informative, professional, very knowledgeable, courteous, and proficient. He was clean cut, well mannered, and made you feel at ease. Pete gave me the impression he loved his work and it was more than just a job to be done. I am very happy I used "Your Mechanic" services and got Pete as my service technician. My cost was lower than if I had taken it somewhere else and more personable. Communicating directly with my technician instead of a clerk behind a desk, that writes up a work order for the mechanic to read, solved my problem faster and with more precision. I will definitely use Your Mechanics services in the future and definitely ask for Pete again. Thank You very much Pete for a pleasant stressless hour.
2001 MITSUBISHI GALANT - CHECK ENGINE LIGHT IS ON - SAN DIEGO, CALIFORNIA

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