Ignition Systems ControlOBD2 Codes

P0325 – Meaning, Causes, Symptoms, & Fixes

What Does Code P0325 Mean?

  • P0325 definition: Knock Sensor 1 Circuit Malfunction (Bank 1)
  • Issue Severity: LOW – Continued driving for a short period of time is okay
  • Repair Urgency: Get this fixed within the next month to prevent damage to your engine and emission system.
  • Diagnosis: 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.

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

P0325 Causes

There are many potential causes of code P0325.

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

P0325 Symptoms

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

How Do I Fix Code P0325?

With a knock sensor fault, the first step is to get it diagnosed to figure out what is causing the problem. 

If your vehicle has this fault and you’re not comfortable diagnosing this issue at home, we recommend finding a RepairPal certified shop nearby to pinpoint the problem and give an accurate estimate for repairs. 

These shops can not only help you figure out what’s going wrong before you waste time and money on the wrong parts, but they also offer a minimum 12-month, 12,000-mile warranty and stand behind all their estimates with guaranteed fair pricing.

> Find a RepairPal Certified Shop Near You

How Much Does It Cost to Fix Code P0325?

P0325 can be caused by anything from damaged wiring to a bad knock sensor to an overheating engine. It’s impossible to give an accurate estimate without properly diagnosing the issue first. 

If you take your car to a shop for diagnosis, most shops will start with an hour of “diag time” (the time spent in labor diagnosing your specific issue). Depending on the shop’s labor rate, this typically costs somewhere between $75-$150. Many, if not most, shops will apply this diagnosis fee to any required repairs if you have them perform the repairs for you. From there, a shop will be able to give you an accurate estimate for repairs to fix your P0325 code.

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Possible Repair Costs for P0325

For error code P0325, one or more of the below repairs may be needed to solve the underlying issue. For each possible repair, the estimated cost of repair includes the cost of the relevant parts and the cost of labor required to make the repair.

  • Knock sensor: $297 to $381
  • Knock sensor harness: $14 to $66
  • Temperature sensor: $392 to $427

DIY Steps to Diagnose Code P0325

Engine code P0325 could be caused by a number of things, including damaged wiring, a bad knock sensor, or an overheating engine. If you’d like to try to fix code P0325 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Keep in mind this is an intermediate-level diagnosis and repair and not recommended for beginners. Diagnosis requires more specialized equipment beyond what the FIXD Sensor can provide and it can be a time and labor-intensive process for inexperienced DIYers.

DIY difficulty level: Intermediate

This repair requires mechanical knowledge and is not recommended for beginners.

Tools/parts needed (our top picks from Amazon):

  • FIXD
  • Live Data (Found on FIXD App with Sensor)

STEP 1: USE FIXD TO ENSURE NO OTHER ENGINE CODES ARE PRESENT.

Use FIXD to scan your vehicle to verify P0325 is the only code present. If not, make a note of the additional codes, as they help diagnose the problem.

STEP 2: CLEAR CODES, DO A ROAD TEST.

Clear the fault codes with your FIXD sensor, then go for a drive to see if the problem comes back. Include some uphills and hard acceleration, which are both conditions that would cause engine knock. If the Check Engine Light comes back on, scan the codes again to see if they are the same or different than the first time.

STEP 3: CHECK KNOCK SENSOR SIGNAL.

Using FIXD Live Data, check the knock sensor voltage to ensure that it is within the specified range. If it is not, or if there is no signal at all, skip to Step 5.

STEP 4: CHECK TEMPERATURE SENSOR SIGNAL.

Using FIXD Live Data, check the temperature sensor voltage to ensure that it is within the specified range. If it is not, the temperature sensor may be sending false readings to the PCM, which could cause a lean running condition and engine knock. Check the temperature sensor and wiring and replace if necessary.

STEP 5: INSPECT KNOCK SENSOR WIRING.

Visually inspect the wiring around the knock sensor for disconnected or damaged wires.

STEP 6: REPLACE KNOCK SENSOR AND HARNESS.

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.

Common P0325 diagnosis mistakes

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

Still Need Help Fixing Code P0325?

If you’ve followed the steps above and are still experiencing check engine code P0325, please contact the FIXD Mechanic Hotline if you’re a FIXD Premium subscriber or find a RepairPal certified shop near you to get the right repairs at a fair price.

Justin-Hughes

Recovering autocross and track day enthusiast. Once turned a VW Jetta into a pickup truck. Lives in a van down by the river. Dream car: 2001 Subaru WRC rally car.

Justin Hughes
Recovering autocross and track day enthusiast. Once turned a VW Jetta into a pickup truck. Lives in a van down by the river. Dream car: 2001 Subaru WRC rally car.

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    30 Comments

    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:
      P0102
      P0327
      P0365

      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 I like to have my electrical system check can fix do that

    15. 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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