Ignition Systems ControlOBD2 Codes

P0325 – Meaning, Causes, Symptoms, & Fixes

Reading Time: 2 minutes


Code P0325 Definition

Knock Sensor 1 Circuit Malfunction (Bank 1)

Code P0325 Meaning

Knock sensors are solely used for the purpose of sensing when your engine is “knocking,” or sensing when there is exploding in the air/fuel mixture in a way that delivers less power and can also damage the engine if prolonged. When the engine “knocks” there is an excessive amount of NOx that is released. When trouble code P0325 is set, this means that the knock sensor 1 in Bank 1 is not operating properly.

Symptoms of Code P0325

  • Check Engine Light
  • Loss of engine power
  • No noticeable drivability issues

Causes of Code p0325

  • Faulty sensor 1 Bank 1 knock sensor
  • Engine is running excessively lean
  • Faulty or damaged knock sensor wiring
  • Engine coolant system fault

Code P0325 Severity – Low


There are no driveability concerns with trouble code P0325. However, along with all Diagnostic Trouble Codes, there should be a sense of haste in getting this repaired so that there is no further damage to the engine.

Code P0325 Common Diagnosis Mistakes

There are times where the engine/fuel coolant system are the issue and replacing the knock sensor immediately will not make the Check Engine Light turn off.

Code P0325 Diagnosis Steps

  • Tools Needed to Diagnose:
    • FIXD
    • Live freeze frame data (Found on FIXD App with Sensor)

How To Diagnose P0325

  1. Check to see if there are any other codes along with P0325 and clear your Check Engine Light with FIXD
  2. Test drive the vehicle and attempt to replicate the driving conditions that will also give similar if not the same freeze frame data in an attempt to pinpoint the issue.
  3. Is the knock sensor sending a signal to the PCM? If so, there may be an issue with the coolant temperature readings. If not, the knock sensor may need to be replaced (Step 5).
    1. If there are issues with the coolant temperature readings, deal with them ASAP because an overheated engine can definitely cause the engine to knock.
  4. Conduct a visual inspection of the knock sensor wiring, and any connections to the knock sensor to make sure there are no signs of disconnection, tearing, etc.
  5. If the conclusion is that the knock sensor needs to be replaced, then it is often recommended to replace not only the sensor but the knock harness as well.


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  1. I change my knock sensor but my car us still doing the samething

    1. So do I. I changed it 3 times ,and it still comes out.

      1. I changed both sensors twice and the harness. It started with two codes p0330 and p0325 and now it only shows p0330 but I don’t know what to do now.

        1. My rx300 had this problem, change out both knock sensors and harness but would still throw codes. Locking me out of overdrive and bogging engine power, definitely frustrating.
          So I did a thing…
          Went straight to the PCM wiring harness. luckily I only had one bank that kept throwing codes. So I found the wiring diagram, spliced my bank1 to bank2 cutting out bank1 completely. Check engine light off, engine power restored and not locked out of overdrive.
          That was 3 years ago, my rx is still on the road with over 200,000 miles.
          Good luck ??

          1. I am about to do that. 2000 Toyota sienna ce. 156,000 miles .

          2. bro what do mean by spliced???? spliced your bank 1 tk bank 2

      2. I’m not having any knocking engine problems. I have a starting problem. It will start like a new one for a few days, then all of the sudden it sounds like the battery is dead and won’t start. HELP!!!!

        1. What is bank 1 and bank 2 is it type of type of sensor?

    2. Have you disconnected the battery? The ecu needs to be reset or else the code won’t go away.

      1. How to reset

      2. I have. And also just disconnected the positive cable and it ran fine. So I have eliminated the alternator. My front end has absolutely no shocks so I’m thinking I could have knocked something loose on the starter.

    3. Ever found out the problem?

  2. I chance the knock sensor and the light still showing on the dashboard, and on the fixd sensor still telling me the I have knock sensor malefunction problem. Can’t fixed

    1. I have the same issue

    2. It has to be odm knock sensor to pass the codes now if the check engine light shows up for the knock sensor meaning your cooling system needs to be fix or you’re not getting enough gas meaning as your fuel filter is clogged

  3. i have nissan fb 15 on machine diagnosis the crank and knock sensor were recorded malfunction after replacing the two sensors the machine is still reading crank and knock sensor even after erasing the error.also the engine is losing power could it be linked to faulty gas regulator.

  4. My problem is I can’t find it and can someone tell where it is on motor it’s an 08 Saturn vue 3.5l gm motor

  5. Its behind the right side catalytic converter..you have to remove it along with other stuff to gain access

  6. I have a 2002 bmw 325i with three codes showing:

    Could one of theses codes cause the other codes to appear?

  7. i have Toyota sieena 2006 with this error code P0 328-Knock Sensor Circuit Malfunction, P0 305 TOYOTA cylinder 5 misfire detective but i check engine came on and later went off

  8. I have a 2000 Infiniti QX4 suv. Light has been going on and off for awhile. Now it stays on. My son ran codes and they cam.e out PO325 an,d PO153. (knock sensor and 02 sensor) Will these keep it from passing smog? And, approximately how much should it cost to have these repaired?

  9. First I got a P0324 code replaced knock sensor lasted 3 days now P0325 code is coming up. Along with P0324. 2016 Chevy Sonic anyone else with this issue and how to correct it

  10. What if I am only having the knock sensor code but no loss of power or knocking noise. Do i still need to replace the knock sensors?

  11. 04 crv gets p0325 code only when driving over 25 mph. when in neutral I can rev up to 6k with no code. sensor was replaced with no luck

  12. I’m not having any knocking engine problems. I have a starting problem. It will start like a new one for a few days, then all of the sudden it sounds like the battery is dead and won’t start. HELP!!!!

    1. I have a 2000 nissan frontier 3.3l v6 and i filled up the gas tank and drove for 15 miles and it started acting like it was running out of gas so i pulled off on the side of the road and it died. Tried to start and all it does is turn over but won’t start. I have a code p0325 knock sensor.

  13. Where is the knock sensor located in my 2008 Honda Accord so I can replace it in bank 1 bank 1 and where is the throttle knock sensor located in same car

    1. You have to go from under the car it’s right behind the engine

  14. I have a 97 F150 XLT 4.6 8cyl 100,203mi. I have noticed a knocking sound and obvious loss of power when going uphill/inclines. Makes no noise and runs great otherwise. Could this be a knock sensor? Also, the temperature is always at a constant acceptable reading. Any help would be great. Thank you.

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