P0325 Knock Sensor Diagnosis - EricTheCarGuy

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As you can see by the title this video covers the diagnosis and repair of a P0325 on my 1997 Subaru Legacy L model with 2.2L engine backed by an auto trans. I did have some trouble with the 'factory' diagnostic procedure but thankfully my friend Mark at Wells Electronics had a test that involved a voltage drop across the sensor that worked perfectly. I hope this video illustrates the import ants of understanding a circuit that you're diagnosing as opposed to just throwing parts at something, with a little time and effort you can do a proper diagnosis.
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Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy.

Опубликовано:

7 сен 2024

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Комментарии : 562

@tahitianflower 10 лет назад

Really like how you post your failures too..makes me feel like youre genuine.

@UOttawaScotty 2 года назад

This is one of those pillar OG RU-vid channels that is ALWAYS good no matter what, thanks for your hard work Eric !

@J00bles 12 лет назад

As a technician myself, i truly enjoyed this video. It's always great to see how another guy goes about checking for faulty sensors, and i appreciate you keeping all of the "bloopers" of the failed readings within. Its just proof that not everything will work 100% every time! thanks again for another chapter, Eric!

@thewhiskeysgt 8 лет назад

Thanks Eric. I have a 2001 suby and just had the bad news from mechanic that I have a knock in the engine and it wasn't worth putting money into a car with 200k miles on it. I had the same issue with performance slow to go from a stop. I found your video and the called the mechanic to see if they even tested the sensor. They said yes we did. I asked did you try to put a new one to see if that was the problem. No they said. I went to the parts store and it took me 10 min the change it. And now I am back in gear with my trusted suby. Going for 300k.

@pamelavance648 Месяц назад

Is suby still on the road to 300,000 😊😊😊

@rrbrian222 12 лет назад

Looks like the comment about doing this repair the scanner danner way has been removed. For me, the guy in his garage trying to fix his car, Eric's method of diagnosis is more practical/economical and still goes beyond just "throwing parts" at the problem because he verified the root cause. Excellent video, thank you Eric.

@eyesalooking 2 года назад

Thank you. I am new at this stuff learning from all of you experienced you-tubbers. There are still some older Subarus still on the road, so this information is still valuable in 2022. I will be using this to test a 2001 Subaru Outback with a check engine light. From my research on the internet if you get to 5v unplugged it means your wiring is good all the way back to the ECM.

@Da305Alive 12 лет назад

That how a REAL mechanic gets it done. No parts changer here. Great vid Eric!!

@dobisayek 8 лет назад

I truly appreciate your visual (video) work, arrows pointing towards the crack, showing pertinent line on your code reader,.....etc. will remember at 12:27 word of the day : "Mental Library", will use it with your permission!

@douglasmorgan9855 8 лет назад

youtube is awesome it's the perfect tool for the do-it-yourself kind of guy

@livemeyer 8 лет назад

LOVE that paper trick! Going to use that one for sure!

@DJDevon3 12 лет назад

You did everything the manual said to do and you felt defeated... makes me feel bad for the Subaru techs that had to deal with crappy manuals all the time. Ouch. GJ. Looking forward to more like this.

@Roger-pw3zz 9 лет назад

Can't tell you how much I learn watching your videos. You are a natural educator. Nice work all around.

@Nwest82 10 лет назад

Thanks again Eric for another great DIY mechanical video. I too am dealing with the p0325 code on my 97 maxima. And having performance issues which I think may part of the problem is the knock sensor, (KS). The first test you tried didn't work because you multimeter can't rang high enough. I just bought a $50 one and its really nice, but even this meter can only range as high as 40M ohms. Thanks for displaying the other way of doing it. You pointed out a little crack in the KS. One thing the FSM doesn't tell you, even though it practical %100 true, is that if there's even a small crack the KS is guaranted bad. Don't know why the FSM doesn't list this as part of the diagnosis procedure. Its the same as the FSM for my 97 Maxima.

@jassboona8040 5 лет назад

Nate West I have a 97 also , were is it located at

@jassboona8040 5 лет назад

How can I change it easy ?

@bigoak7010 Год назад

Good to see an honest proper repair rather than a hack to bypass the knock sensor. One fellow published hack on RU-vid for a Lexus so that the buyer of the car would not see the check engine light. Thank you! Keep it up. Integrity gets noticed.

@jschirr 12 лет назад

Way to go the extra mile here. Nice job, and incredibly satisfying seeing this done appropriately.

@mmuller3233 5 лет назад

Thanks for following up with the test drive & suggested test procedure letter. A very comprehensive and user friendly tutorial from start to end!

@jay7264 12 лет назад

another great video eric. i followed your advice about my hard starting solara and it was the fuel pump for whatever reason the fuel pressure would drop over night which is why the hard starting was only after the car sat for awhile thanks so much

@bikerrealengo 9 лет назад

Erick...thanks for show us your skills in mechanics and the real problems and solutions you found...good job...!!!

@darkbyte2005 7 лет назад

this was absolutely fantastic trouble shooting , and Eric your perseverance was impeccable... I learned something as well about knock sensor

@pro6580 10 лет назад

EricTheCarGuy 1990 na vg30e to vg30dett Frankenstein motor, took about 12 months and allot of blood sweat and money but in the end it is well worth it! thanks again for the free lessons brotha

@wmcartpusher04 12 лет назад

Very glad to see you checking the NEW knock sensor for resistance. Good man. ALWAYS CHECK NEW PARTS!!!

@zee-lusay4087 9 лет назад

Do a quick check on your multi meter. Some have a limit to what they consider "continuity". 0.7 mega ohms is a lot of resistance to consider clear circuit. I myself always try a reading of the actual resistance before I say the circuit is open. It tells me if there is a bad connection or broken connection/wire. Thank you Cape Hatteras NC for teaching me that lesson.

@Bob-hh2sf Год назад

I have a 2001 Subaru Outback 2.5L My knock sensor was replaced by my mechanic. I tell him my check engine light comes on and goes off intermittently but not all the time. My engine performance is being affected and mileage. Thanks for your video now I’m doing voltage testing on my own. I will probably get the sensor from Subaru parts department at the dealership because I understand these sensors have a specific frequency compared to aftermarket. Like rock auto

@mechanacae811 8 лет назад

The stuff in the schematic you were wondering about was the shielding for the knock sensor wire, grounded at the ECU. Without it the EMP from the coil could induce a slight enough current in the sensor wire to trigger a false positive for knock. The funny looking parts are just connectors where the shielding is joined to the other pin.

@user-px9zd5bg5c 3 года назад

Thank you very much , there are two things about the sensor that i was confused about and I found the answer , you are the first-rate technician.

@phasehalide 9 лет назад

Eric i have been following you and you videos for quite a while now, it looks like you are a great mechanic and do very many things and inform people about so much and i appreciate you and what you are doing very much but you possibly have overlooked something here... The Subaru manual should be correct, What i saw you where checking was continuity witch is measured in ohms NOT Kilo ohms! What you would have to do is turn the dial of you multimeter to the 1000 or 2000 kilo ohm setting and then look for a reading with the plug disconnected as you did and that should give you a correct reading of something close to 700 Kilo ohms. Kilo ohms are in the thousands not hundreds. I hope i make sense, keep up the good work man!!!

@Spencerianism 12 лет назад

Comprehensive to the max, Eric..Kudos! Any other "mechanic" Would say it's shit and call it a day, and that attitude just doesn't hold water in the real world..Excellent job on a proper diagnosis.

@Zeppelin6882 8 лет назад

you said that Eric... this is the real world. Thanks for sharing this video.

@2cyclemix 10 лет назад

Dude, great job on the video and not giving up and assuming it was fixed.

@rpinarreta 10 лет назад

Common issue with the late 90's EJ25 Subaru engines. My local parts dealers wanted anywhere from $69-$144 for a replacement sensor. After reading Subaru Blogs and found may successful installs of a $14 Ebay replacement part, I thought what the heck. Installed the new sensor cleared the OBDII code P0325 and wow no more engine shaking and no more "check engine light". Since floored at the price via ebay vs traditional parts retailers.The knock sensor is not that complex and cost

@klmartin1962 10 лет назад

Good job of following through. On GM products, I always used a long extension and a small hammer on the block beside the sensor while the vehicle was running. This worked great on them. One thing I wanted to mention, just fyi, most sensors have the same 5vdc reference. You can almost always check any sensor (input) that same way. Great job. I love the videos. Thanks for sharing.

@letthechipsfly7620 4 года назад

Outstanding."I want you to understand the diagnostics" ........Best YT bar none. Thanks Eric.

@plznotears 11 лет назад

Your service manual was correct, it didn't ask you to test the resistance of the sensor, instead it asked to ensure that there is no short circuit to ground, reading an open circuit tells you that your sensor is not internally short circuited directly to ground, 700kohms is basicly an open circuit in a 12v system Good video's Eric, keep it up!

@darrinsiberia 10 месяцев назад

When my transmission shop put in a new transfer case is it possible they shorted this sensor because now I have a p325

@alldayandnight09 12 лет назад

the tap test has worked for me on some cars though. its kinda cool to see the data change but it wouldn't be enough to justify a replacement sensor. you should always test the sensor and circuit. great video! Real world diagnosis at its best.

@JC-mr4rz 4 года назад

Your reading resistance with the battery hooked up? Hmmm Suburu was very thoughtful to place that sensor in such an accessable place! 🙏

@pjvenda 12 лет назад

Hi Eric, depending on how your multimeter works, you might want to avoid using the continuity sensor to probe for resistance (as suggested by the manual). My multimeter will beep in the continuity tester mode if there is continuity, which in its terms is having a resistance of less than 25 ohm. In other words, the continuity tester not beeping would not mean the test had failed (according to the manual). Yours might be different and may behave in a different way.

@qx9r7man 12 лет назад

Hi Eric! Computer power supplies often give 5v and 12v signals that are off (usually low) by half a volt. Chalk it up to losses and inadequate connections. Keep up the good work!

@poraradi1919 8 лет назад

I LOVE ALL YOU VIDEO BECAUSE YOU COVER ALL POSSIBLE EXPLANATIONS FOR THINGS THAT HAPPEN.

@cbh148 11 лет назад

So glad I watched this. Nissan's factory service manuals says the same thing for testing their knock sensors (which are almost identical to Subaru's), and that's to check for continuity on the sensor itself, and that's just flat-out wrong just like in this video! I'm bypassing my knock sensor with a 1 megaohm 1 watt resistor to never deal with it again since I run 93 octane and have a lot of modifications that can cause sounds that the knock sensor might misinterpret as predetonation.

@robertv8851 5 лет назад

That's why it was working and then not working.what scares me can you short the computer acidently back probing Eric,thank you this was very help full

@rulerpaco 10 лет назад

we keep learning every day.. good work, videos like this saves time and money when looking for a problem. and how to solve it

@zxtenn 12 лет назад

Hey Eric, i sometimes use some permatex #2 to hold bolts but your method is neater

@aussiefirestorm 12 лет назад

Very very good video, showing the people what us mechanics sometimes have to go through to figure what is going on or off as the case may be. This is how to do it properly rather than just bolt on parts and hope.

@MrSnowmobilefreak 9 лет назад

I'm not going to lie, I thought when you started to talk about smacking on the engine with a hammer I thought you were just being funny. but I gave it some thought, pretty clever!

@Knightfamily102 8 лет назад

Eric, that was really funny when you were in the car. Made me chuckle well done

@crickle47 4 года назад

Working on a 1990 MB 500SL, that has severe timing retardation, and your video helps tons, BECAUSE the knock sensors (2) are underneath the engine mounts, ffs. So, it will be nice to have a confirmation that this is what is causing my driveability problem. Thanks again.

@xai1603 8 лет назад

good quality stuff Eric, and as always being modest and an honest guy way to go on both test from this vid and the follow up to retest the factory manual testing method!

@RandallFlaggNY 8 лет назад

One of the best videos I've ever seen on RU-vid.

@granlyfernandez4414 7 лет назад

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@granlyfernandez4414 7 лет назад

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@Perrytraywick 5 лет назад

Paper trick is worth it’s weight in gold! Love it. Will use it.

@ashk0102 10 лет назад

Hello Sir, I am your student and always trying to learn some thing from you and i am thankful for that. Most of your videos you teach us are based on old models while i am dealing with most of new model cars so please Sir try to teach us on some new models too. Thanks best regards.

@jsunstiles Год назад

10 years later and many dropped bolts and cuss words..Thank you , the paper in the socket trick is what this video is all about...what knock sensor?

@tomcraigmatthews9300 4 года назад

Thanks for real world problem solving.

@myadler 12 лет назад

Eric, I can not believe you didn't rip apart the bad sensor. That is usually where I learn the most, how a knock sensor works and, when they break, why.

@392_brooklyn2 9 лет назад

Great video dude and very hopeful I have the same problem on my srt8 charger they just change my crankshaft damper and my antifreeze coolant and the nose is still going. well the great thing about this that my car is under the warranty dodge just returned my car today and I'm returning it back tomorrow I'm going to tell them specifically to change ticking sensor hopefully that's the problem. Once again 👍👍on the video. Thank you

@richstarbuck4315 3 года назад

Eric, your video made me realize that the knock sensor has no resistance, until it is activated and that the sensor has to see some vibration from engine to keep the light off. I replaced mine in a 2002 Camry 2.4 and still kept getting the code. I isolated it from the engine and grounded it but still got the code. So I relocated it higher on the head bracket to see and no more code. The engine runs smooth and now my transmission shift to high. Still don't know why the original location kept throwing the code, Thanks

@arsonist63086 12 лет назад

this video help out a lot thanks man and i know what you mean about what the service manual says one thing a real life says onther , but like the fact that your curiosity didnt let the fact go that th new knock s. was coming out bad with the service manual test

@chafflube 11 лет назад

Great video and thanks for the paper in the socket wrench tip. I will definitely use that in future. There is nothing more frustrating than dropping bolts into places you cannot reach them. Keep up the good work. Your videos are fantastic, Eric!

@greygoosealky 11 лет назад

I believe there are two sensors and you have to remove the intake manifold to get to them. Also I would replace the short knock harness they get corrosion in them sometimes.

@dustergirl107 12 лет назад

Thank-you. I changed it. The check engine light is off and it doesn't cut out going up a hill now. I was a B**** to get to, but it's done.

@pro6580 10 лет назад

EricTheCarGuy its funny that "in essence" reasson you made this video ( to teach people the mindset of learning to trouble shoot items) is something you actually had to you yourself in this video when im sure you figures you were just doing another quick everyday test on a knock sensor circut, simple enough lol.. life man its awesome how it can keep on our toes, keeps things interesting. well enough babble thanks for making the video ive learned a few different test methods from you which helped me fix my TTz32. thanks man keep doing what your doing!!

@miker.5495 3 года назад

That little piece of wisdom made my day. Thanks Eric!

@armandobenabides3693 Год назад

This helped so much! I KNEW something was funny with that manual test procedure! Thank you!

@TooSlowTube 8 лет назад

At 8:20 ish, what range was the meter set to? Is it auto ranging? The green lettering doesn't show up on the video, but the display shows 200, over a little square blob. As it reads 0.3, for 0.3 Ohms in your continuity test, it would seem to be set to a 0-200 Ohm range, in which case anything over 200 Ohms would show as out of range. The meter I have with a setting that beeps for continuity only does that on the 200 Ohm range, which makes me think that's what happened there. Also, what does your meter show when you just touch the probes together? Mine shows 0.2 Ohms as a minimum. I own a few digital multimeters, and they all do that.

@nasboost1031 3 года назад

Even tho the hammer trick didn't work i appreciate the creative troubleshooting ideas.

@SirSeanSean 12 лет назад

I had the same intermittent lag/bog on my 92 Legacy. It turned out to be a bad connection on my air filter housing. Thanks for the replacement video.

@ronparsons3496 9 лет назад

After working on Subarus for a few years...when using the manuals look for the updates. Until 2006 the manuals were in book form, after that they were on the computer. In the books the updates were sent desperately. And you had to check the updates. sorry you had so much trouble.

@osvaldoesquivel5633 10 лет назад

I have a question about this topic but since i notice Eric isn't answering any ones questions, I'll just hold my breath..

@red2965 9 лет назад

it couldn't be that Everyone seems to be asking questions way OFF-TOPIC could it,,,, I mean really brakes has absolutely nothing to do with a knock sensor

@MyBrilliantChannel 12 лет назад

Great video Eric, nice to see you found the evidence in the end! It gives peace of mind when you know that the part you replaced was the culprit without just replacing it and hoping the problem goes away.

@zeidar 12 лет назад

Nice video, things don't always work out well even for professional mechanics, glad the issue got resolved though.

@rockofages-cs3fq 9 лет назад

Good tip thanks Erick i have a 2000 altima and it runs smooth but on the idol is rough n sometimes a little Stallish when i start from a stop engine light is on to i think thats it maybe.

@ddmd80 12 лет назад

ETCG as a 97 Legacy owner myself I really appreciate this video thanks for taking the time to video the entire process and following up with a good repair confirmation. Your RU-vid channel is great!

@xanderlander8989 11 лет назад

You sir are correct about the "auto" beeper mode. the range on my meter is 0-100kOhm so anything above that will read as open in auto mode. It would be interesting to test the two sensors in manual mode...

@wkl747 12 лет назад

good honest, detail oriented mechanic; also good illustrator

@moderndino 10 лет назад

Mastergx1's suggestion is valid..... I'm an engineer and a mechanic. You could try an analog meter (the one with a needle), or do what I'm able to do. I use an oscilloscope to see the output of the suspect knock sensor. It is a crystal (piezo) device that generates an electrical output when stressed mechanically. Some phono and microphone pickups use this tech. A crystal pickup is high resistance.... 700K ohms is high and typical. By connecting the scope probe to the sensor, you only need to tap it lightly to see the scope trace dance in response. This way you are sure of the initial fault, and the value of your repair. I've done this on the EJ22 engine.

@SuperTurboDiesel2 12 лет назад

LOL, I thought the exact same thing! In Eric's defense, I'll bet good money that the old sensor was still bad though. Subarus are known for defective knock sensors. Eric's test procedure and video on this one sure wasn't very good, but he got the job done. I would have sandpapered the engine block up a little where the sensor mounts, to ensure a good ground and used a little dielectric grease. I would have tested the NEW sensor's ohms readings and compared it to the old one before installing it.

@danparker3751 11 лет назад

Eric the Car Guy for President!!

@clayhunt1284 5 лет назад

Thank U for a real life diagnosis... I just did this the other day .. and I wish I saw this first

@colinadams495 10 лет назад

I just did this for the first time on an 01 Legacy and it was easy. And to think at first I was nervous about it

@kls04phx 11 лет назад

This is a great video. Im having an issue with a Lexus, now I have a good place to start. Thanks a lot for this video. You rock!

@Rustbox306 12 лет назад

Great video! I love going all the way to the bottom of things like you did there.

@botella7771 8 лет назад

thank you for your honesty, great video. i enjoy it

@skip741x3 4 года назад

Im amazed so many people have never used the paper trick to hold a bolt or nut in a socket, thats something Any experienced mechanic would have improvised ...its great advice, yes, but its also common sense...

@gilbertojim1263 2 года назад

Thanks a lot great video you’re the only one Des Plaines clearly what to do

@UtubeIhate 11 лет назад

I'm not Eric, but i think i can help you :D. A bad intake gasket or vacuum leak can also cause the engine to run like crap and set off those codes. Start by checking for vacuum leaks. Change (or inspect and clean if they are made of metal) the intake gaskets since those should be relatively cheap, same with any vac hoses. You'll probably need a head gasket though, because white smoke means burning coolant. This could be causing your problem as well via a compression issue, but i doubt it.

@MrGuitarRadio 12 лет назад

I am not familiar with that brand of DMM (digital multimeter) I also thought that te meter was set on continuity check and wouldn't be albe to measure higer resistance such as 700 kilo Ohms on that setting. (Can't see the green legends on the video). The second procedure IS more conclusive. Thanks for always going the extra mile and include it in the video instead of just leaving it at the first attempt.

@muadeeb 12 лет назад

Yes, you have a $400 (list) meter, ETCG has a much less expensive meter that was re badged as a Snap On. Continuity can usually test up to 200 Ohm.

@SuperTurboDiesel2 12 лет назад

Exactly. Improper test equipment. (Or, improperly set at least.) Anyhow, at least he fixed the obvious problem, which was a defective sensor. Subarus are known for their knock sensors to go bad.

@cindynapoli7530 29 дней назад

Glad it happened to you it was quite funny.. Mine does that as soon as I go to the mechanic

@JohnzCarz 12 лет назад

I’d go back and set the meter to a higher resistance value - like 10M. Looks to me like you have it set to 200 ohms, if your meter works like some others, trying to measure a resistance over that will just show infinity. Yours may work differently, but all of mine work this way.

@rkstr9965 5 лет назад

@3:45 Don't be so hasty to assume your diagnosis method did not work - you did it on a what was later determined a bad sensor. In that case you should not have expected to see the ignition advance change with a bad sensor. After installing a "working" knock sensor you should have gone back and tested this procedure. If the ignition advance changes with the new working sensor then your procedure/test is valid and useful.

@johntaylor4193 8 лет назад

That was sure a lot more helpful than the service manual.

@vicus1361 9 лет назад

Thank you so much!!!! An amazing video!!!! It is interesting to know if there isn't another problem. I have the same BS on my 99 subaru forester and I want to know if it is "OK" simply replace the Knock Sensor.

@Autofixgarage-ng 3 месяца назад

Eric u re a genius of high standard. Pls try to make a video on knock sensor live data.

@MrKronen75 8 лет назад

As far as I know , when a multi meter is set to read continuity (which is very low ohms or short), it won't read 700kohms , which is high ohms , measure it with proper range. You tip with paper to hold the screw is brilliant

@devilmastah 11 лет назад

Seeing the paper at 18 minutes the shock sensor is based on a piezoelectric element (which are used commonly as shock sensors in all kind of things). Next time you find that such a sensor doesn't work measure the resistance over the two pins of the cable. You should get your 700 k ohms there (pretty common own resistance value for piezo elements of that size).

@jaymiewakefield9189 10 лет назад

Hey Eric, good video. The original factory test would have worked to diagnose the bad sensor as well. You essentially did the same test two different ways. The knock sensor is not grounded through the block like other sensors. The ground comes through the wire from the computer, so when you disconnected the sensor, it was no longer grounded. When the service manual stated to test the resistance to ground, it wanted you to test the resistance through the sensor itself. You would use one prong for negative and the other for positive and measure the resistance through the sensor. I suspect, based on your voltage test, that the resistance would have been very high and proved the sensor to be bad. The voltage drop test is more comprehensive, but also slightly more time consuming. You could start with the resistance test and if that proved the sensor to be bad you would know to replace the sensor. If the resistance test was inconclusive you could move on to the voltage test and get more answers.

@andrewthompsonuk1 12 лет назад

Different ohm meters have different voltages for measuring ohms. The sensor has a constant voltage drop but the voltage your ohm meter uses is less than the two volts. The Subaru guys did not consider this when they wrote the test!

@gypsyspirit8472 11 лет назад

Great video! Very informative. I just had my maf changed. My codes went from 10 to now 3. The knock sensor is showing up. I'm about to go and try to locate it. I have a i30t infiniti 1997. I hope it's not dificult to get to. This lady likes to handle all she can on her own first. I will return to let you know how it went. Sista C

@thejuice7020 6 лет назад

Gypsy Spirit how did it go?

@ahkillez64 5 лет назад

Had the same deal with my Toyota solara. Hesitation if you hit the gas too much but if I am gentle with the gas pedal it eases to acceleration. My code is bank 2 sensor knock sensor and a bad upstream oxygen sensor (easy part)...knock sensor is more difficult though if you dont have a car lift