1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

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

    Joined:
    Aug 16, 2018
    Member:
    #263009
    Messages:
    15
    Gender:
    Male
    First Name:
    Justin
    Vehicle:
    1999 Tacoma SR5
    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,Haltech,meth, 750k

    Joined:
    Oct 5, 2013
    Member:
    #113940
    Messages:
    10,246
    Gender:
    Male
    First Name:
    John
    Denver
    Vehicle:
    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 750,001 plus miles, Original Owner
    V6 5sp,RegCab,TRD Supercharger, 1.9” pulley, methanol injected Haltech ECU, AC TRD supercharger,(MUST DO) TRD supercharger ported, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley, (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, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks 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, Marlin crawl shift kit. 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 Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel,
    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

    Joined:
    Oct 25, 2018
    Member:
    #270626
    Messages:
    8,310
    Gender:
    Male
    First Name:
    Todd
    Tucson, AZ
    Vehicle:
    2003 4Runner V8 Limited
    4th gen T4R with a few mods
    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

    Joined:
    May 11, 2014
    Member:
    #129576
    Messages:
    398
    Gender:
    Male
    First Name:
    Zach
    Louisiana
    Vehicle:
    2001, double cab, 4WD, 3.4L Tacoma
    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

    Joined:
    Aug 16, 2018
    Member:
    #263009
    Messages:
    15
    Gender:
    Male
    First Name:
    Justin
    Vehicle:
    1999 Tacoma SR5
    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,Haltech,meth, 750k

    Joined:
    Oct 5, 2013
    Member:
    #113940
    Messages:
    10,246
    Gender:
    Male
    First Name:
    John
    Denver
    Vehicle:
    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 750,001 plus miles, Original Owner
    V6 5sp,RegCab,TRD Supercharger, 1.9” pulley, methanol injected Haltech ECU, AC TRD supercharger,(MUST DO) TRD supercharger ported, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley, (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, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks 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, Marlin crawl shift kit. 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 Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel,
    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
    This site contains affiliate links for which the site may be compensated.
    #6
  7. Jan 20, 2019 at 2:53 PM
    #7
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,Haltech,meth, 750k

    Joined:
    Oct 5, 2013
    Member:
    #113940
    Messages:
    10,246
    Gender:
    Male
    First Name:
    John
    Denver
    Vehicle:
    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 750,001 plus miles, Original Owner
    V6 5sp,RegCab,TRD Supercharger, 1.9” pulley, methanol injected Haltech ECU, AC TRD supercharger,(MUST DO) TRD supercharger ported, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley, (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, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks 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, Marlin crawl shift kit. 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 Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel,
    Here

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

    Ran40 [OP] Member

    Joined:
    Aug 16, 2018
    Member:
    #263009
    Messages:
    15
    Gender:
    Male
    First Name:
    Justin
    Vehicle:
    1999 Tacoma SR5
    Last edited: Jan 20, 2019
    This site contains affiliate links for which the site may be compensated.
    #8
  9. Jan 20, 2019 at 5:47 PM
    #9
    1997tacomav6

    1997tacomav6 V6 5sp,RegCab,TRD Supercharger,Haltech,meth, 750k

    Joined:
    Oct 5, 2013
    Member:
    #113940
    Messages:
    10,246
    Gender:
    Male
    First Name:
    John
    Denver
    Vehicle:
    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 750,001 plus miles, Original Owner
    V6 5sp,RegCab,TRD Supercharger, 1.9” pulley, methanol injected Haltech ECU, AC TRD supercharger,(MUST DO) TRD supercharger ported, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley, (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, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks 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, Marlin crawl shift kit. 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 Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel,
    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
     
    This site contains affiliate links for which the site may be compensated.
    #9
  10. Jan 21, 2019 at 12:51 AM
    #10
    Wyoming09

    Wyoming09 Well-Known Member

    Joined:
    Apr 24, 2015
    Member:
    #153833
    Messages:
    14,277
    Gender:
    Male
    New Tripoli Pa
    Vehicle:
    2000 Work truck 5 speed 4x4 3.4
    Super Springs
    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

    Joined:
    Aug 16, 2018
    Member:
    #263009
    Messages:
    15
    Gender:
    Male
    First Name:
    Justin
    Vehicle:
    1999 Tacoma SR5
    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

    Joined:
    Aug 16, 2018
    Member:
    #263009
    Messages:
    15
    Gender:
    Male
    First Name:
    Justin
    Vehicle:
    1999 Tacoma SR5
    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

    Joined:
    Aug 16, 2018
    Member:
    #263009
    Messages:
    15
    Gender:
    Male
    First Name:
    Justin
    Vehicle:
    1999 Tacoma SR5
    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,Haltech,meth, 750k

    Joined:
    Oct 5, 2013
    Member:
    #113940
    Messages:
    10,246
    Gender:
    Male
    First Name:
    John
    Denver
    Vehicle:
    97 reg cab, v6 5sp 300hp supercharged, Methonal Injection, 750,001 plus miles, Original Owner
    V6 5sp,RegCab,TRD Supercharger, 1.9” pulley, methanol injected Haltech ECU, AC TRD supercharger,(MUST DO) TRD supercharger ported, every 125,000- 150,000 needs rebuild Projector headlights HID 5 speed manual Amsoil for all drive train Smaller 2” pulley, (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, bucket seats corbeau lg1 Tacoma Rubber floor mats TRD fender extenders, Bilstien shocks, King shocks 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, Marlin crawl shift kit. 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 Snow Methonal kit stage 2 Custom 3 core aluminum radiator Linex bed liner Haltech stand alone ECU, Intake supercharger gauge. Stainless steel brake lines, Custom leather wrapped steering wheel,
    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

    Joined:
    May 10, 2018
    Member:
    #253130
    Messages:
    468
    Gender:
    Male
    First Name:
    Juan
    Vehicle:
    1997 Tacoma 4x4 lx xtra cab.3.4
    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

    Joined:
    May 11, 2014
    Member:
    #129576
    Messages:
    398
    Gender:
    Male
    First Name:
    Zach
    Louisiana
    Vehicle:
    2001, double cab, 4WD, 3.4L Tacoma
    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

    Joined:
    Mar 11, 2019
    Member:
    #286187
    Messages:
    178
    Gender:
    Male
    First Name:
    Chino
    Virginia
    Vehicle:
    2012 TRD Sport 4x4
    6" w/35's
    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.
     
    This site contains affiliate links for which the site may be compensated.
    #17
  18. Apr 16, 2019 at 3:05 PM
    #18
    J.A.92

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

    Joined:
    May 10, 2018
    Member:
    #253130
    Messages:
    468
    Gender:
    Male
    First Name:
    Juan
    Vehicle:
    1997 Tacoma 4x4 lx xtra cab.3.4
    I'd
    id just go to the dealership.Its cheap and better quality and you will be assured it's the right one.
     
    This site contains affiliate links for which the site may be compensated.
    #18
    VA_Taco[QUOTED] likes this.

Products Discussed in

To Top