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P0325 Knock Sensor - While I’m in there...

Discussion in '1st Gen. Tacomas (1995-2004)' started by Ran40, Jan 20, 2019.

  1. Jan 20, 2019 at 9:35 AM
    #1
    Ran40

    Ran40 [OP] Member

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    I have a 99 Tacoma 5vz-fe with about 245k. The truck has had the P0325 Knock Sensor 1 Circuit (Bank 1) code since I bought from PO about 2.5 years ago. I’ve read all the posts and I’m going to get in there and check things out. I’ve got the Toyota harness already and I’ll check the sensors when I get in there to see if they are bad too. I also plan on checking the wiring from the harness back to the ECU. My question is while I’m in there is there anything I should look for, clean, or replace? Anything I should look out for when I can see in there? I have all the associated gaskets, plugs and wires are new, throttle body is clean. I appreciate the help
     
  2. Jan 20, 2019 at 10:14 AM
    #2
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    If your pulling it all apart just buy new knock sensors.

    Replace the water line that’s under there too that’s runs in the valley
     
    J.A.92 and cruiserguy like this.
  3. Jan 20, 2019 at 10:29 AM
    #3
    xtremewlr

    xtremewlr Well-Known Member

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    Valve cover gaskets if they are showing any signs of leaking.
     
    cruiserguy likes this.
  4. Jan 20, 2019 at 11:03 AM
    #4
    zach141b

    zach141b Well-Known Member

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    Re-seal this water pipe with FIPG or equivalent, if you're having the intake off.

     
  5. Jan 20, 2019 at 12:55 PM
    #5
    Ran40

    Ran40 [OP] Member

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    Ok, I’ll take care of the water line and I have new valve cover gaskets. I’ve read quite a bit about the knock sensors being rock solid so I didn’t order them. Amazon has the OEM ones for $125 a piece so I was trying to save the $250 if they tested out ok. I’ve seen it said both ways, replace them while you’re in there and leave them if they’re good. I’m kinda leaning towards replacing them cause this is a lot of work. If anyone else has an opinion I’d like to hear it.
     
  6. Jan 20, 2019 at 2:49 PM
    #6
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    I bought my OEM Desno off ebay for around 85.00 for the pair, they were sealed in the bag, stamped Desno and have a date code on them that was less than 7 months old which makes them OEM
     
    Last edited: Jan 20, 2019
  7. Jan 20, 2019 at 2:53 PM
    #7
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    Here

    Screenshot_20190120-155134_eBay.jpg
     
  8. Jan 20, 2019 at 3:49 PM
    #8
    Ran40

    Ran40 [OP] Member

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    After a quick search, it doesn’t look like there’s any on EBay right now. I found the ones linked below on Amazon but the price seems to be too good to be true. I’ll look around online tonight and see what I can find but I’m thinking I might as well change them while I’m in there.

    2 Pcs Genuine Denso Knock Sensor Part 89615-12090 For Toyota Lexus https://www.amazon.com/dp/B073MRBS13/ref=cm_sw_r_cp_api_i_2FqrCb7KZXVQN
     
    Last edited: Jan 20, 2019
  9. Jan 20, 2019 at 5:47 PM
    #9
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 660,001 plus miles, Original Owner
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    There plenty of fake ones.

    OEM sensors will have a date code stamped on them.
    Make sure they have the code and are sealed in the toyota bag and marked DESNO.
    The part number that I used now 60,000 miles ago is

    denso 89615 12040
     
  10. Jan 21, 2019 at 12:51 AM
    #10
    Wyoming09

    Wyoming09 Well-Known Member

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    Just remember plastic plugs get brittle with age .

    They tend to be stuck together and the clips break so easy

    Might want to look at the vacuum hoses they get brittle and crack
     
    jammer likes this.
  11. Jan 21, 2019 at 8:50 AM
    #11
    Ran40

    Ran40 [OP] Member

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    Yeah, I already broke the plastic wiring harness before when I changed out the valve cover gaskets so I’ll be fixing that while I’m doing this. The vacuum lines look good. This is going to take me a few days to complete because of work and the short days this time of year. I appreciate the help and suggestions.
     
  12. Jan 21, 2019 at 9:14 AM
    #12
    Ran40

    Ran40 [OP] Member

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    Anyone have a part number or know where I can find the stud in the pics below? There are two studs that set in the intake manifold and the lower plenum is secured to it by a nut. The front one is snapped and I’d like to fix it

    35F69311-19E5-4210-9609-3F556C5F087A.png B7E712ED-BBAF-4638-90FD-C90B48E2F76E.jpg F948ABA0-B168-4316-AA39-BC2CF2DBEC5E.jpg
     
  13. Jan 21, 2019 at 2:04 PM
    #13
    Ran40

    Ran40 [OP] Member

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    So while I was fixing the plastic wiring protector that I broke earlier I noticed a splice in the wires. After following them out I found they go to the knock sensor harness. In the pic below you can see the gray wire with the blue-yellow sheath has the brown wire from the harness connector spliced into the bare wire. The black wire with the all blue sheath has no brown wire connection to its bare wire. From my reading the gray wire is sensor 2 and the black wire is sensor 1. I have the P0325 code which is Sensor 1. So I’m going to splice both the bare wires to the brown wire from the connector and I believe that should ground both sensors through the single ground from the connector or would that not make a difference since they both go back to the same place in the ECU.47DF0CC0-DC68-4B2D-A899-7EF1B78DDEE6.jpg
     
    Last edited: Jan 21, 2019
  14. Jan 21, 2019 at 6:38 PM
    #14
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,2"pulley,meth, 660k

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    V6 5sp,RegCab,TRD Supercharger, 2" pulley, methanol injected AC TRD supercharger,(MUST DO) TRD supercharger ported, rebuilt 3 times over 500,000 miles, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley,(300hp) (MUST DO) 2004 DESNO fuel injectors, zero ping ping, 2004 side door mirrors Dick Cepek Rims, Michelin tires LTX, ( that last 100,000 miles) Now running Dynopro ATM mud and snow tires KN cold air intake Cat back exhaust with ss exhaust tip, Raised exhaust tail pipe to 2" below body line Optima*dry cell battery,red top Alpine sirius radio, 200 watt amp, focal is165 split door pod speakers Focal door speakers Subwoffer behind seat Viper alarm, Electric Locks Dark tinted windows, 4runner bucket seats, Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks chrome push bar, chrome nerf bars, add a leaf for rear springs trailer iv hitch, electric brake control, Drilled slotted brakes, High carbon steel (MUST DO) EBS green stuff 7000 series pads(MUST DO) TRD engine oil cap TRD stick shift, Rear sliding window 2002 4Runner functional hood scoop cut into Tacoma hood, 4Runner dual overhead map light Gentex Auto dim + Compass + Temp, garage,rearview mirror Corbeau bucket seats Snow Methonal kit stage 2 Champion 3 core aluminum radiator Linex bed liner
    Make sure you soder those splice wires together so you don't have any issues later.
    Also get some TELSA heat resistant tape if you can for the
    wiring harness if yours is all broken
     
    jammer and J.A.92 like this.
  15. Jan 21, 2019 at 6:45 PM
    #15
    J.A.92

    J.A.92 97 Tacoma 4x4 lx 5 speed manual.3.4L

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    I just bought a new sensor and was good to go.
     
  16. Jan 22, 2019 at 3:25 AM
    #16
    zach141b

    zach141b Well-Known Member

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    I would try your local Toyota dealership first.

    If that doesn't work out, try here: https://www.clipsandfasteners.com/Cylinder-Head-And-Manifold-Studs-s/182.htm
     
    J.A.92 likes this.
  17. Apr 16, 2019 at 1:27 PM
    #17
    VA_Taco

    VA_Taco Well-Known Member

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    I'm about to order some knock sensors also but i see you ordered part number ending in "40" and Ran40 mention a part ending in "90". Which is it? I have a 98 4x4 3.5 manual. Ebay and Amazon have "OEM" sensors for around $25. Sounds too good to be true.
     
  18. Apr 16, 2019 at 3:05 PM
    #18
    J.A.92

    J.A.92 97 Tacoma 4x4 lx 5 speed manual.3.4L

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    I'd
    id just go to the dealership.Its cheap and better quality and you will be assured it's the right one.
     
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