As a forme ASE certified automotive technician, this is the best simple explanation I have seen in a very long time.
@JoseRamirez-yh2ll
Жыл бұрын
As the video randomly auto played on my phone, I agree
@aaronw2522
11 ай бұрын
I agree!
@wildthoughts6959
Жыл бұрын
This is the best VIDEO explaining O2 sensors behavior . So many videos on this subject on YT, however all have spaghetti shaped information, unclear and disorganized or vague . This one nailed it. Thumbs up man. You should be teaching classes.
@ronemtae3468
Жыл бұрын
What a great great explanation it’s the first time I’ve actually seen a video that makes sense. Thank you so much.
@carlosabreuv
2 жыл бұрын
Very good video, short and to the point. Thanks Hunter!!
@smartmotives
Жыл бұрын
Very well explained, I come back here often to refresh my knowledge on this
@pallen807
Жыл бұрын
Love this video Straight to the point . Unlike others video that want to tell use all about their life story than 2min of the video u get nothing. Keep it up thanks
@gustavocervantes5435
2 жыл бұрын
Thank you for sharing your experience!! Great video👍
@KantusKid
Жыл бұрын
Concise explanation even if I still can't wrap my heads around it. It at least points me in the right direction.
@Deviantsoundz
4 ай бұрын
Such a nice and simple explanation, and finally, someone mentions that the graphs should look different between sensor 1(up and down constantly) and 2 (a steady reading).
@mikecotton460
3 жыл бұрын
Very clear and concise, thanks.
@Ikaruszaki
3 жыл бұрын
Short and informative. Nice!
@otopere7331
2 жыл бұрын
Beautiful job, simple and easy 👌
@PedroBarbosa-qh6hy
2 жыл бұрын
Awesome explanation ! Thank you
@duckhunter8203
Жыл бұрын
Top explanation my friend many thanks👍🏻👍🏻
@TwoHemiViewer
2 жыл бұрын
That was articulated very well. Well done.
@tonyn7141
Жыл бұрын
Thank you so much. Outstanding explanation.
@Danilo111
Ай бұрын
Excellent video, I already knew most of this but it was a good refresher
@larrygibbons6489
2 жыл бұрын
Excellent Instructional Video !!!
@1982mattd
3 күн бұрын
Love the video dude! Explaining the difference of a narrow band that you're working on here I believe is important information to note you're NOT talking wideband! Im definitely a shade tree mech here so I'm no mechanic in that sense of schooling but im learning lambda a/f sensors! They definitely read differently! Great video for a narrow band buddy! Not talking shit bro just it's good to share that info I think
@MrBerniebling
7 ай бұрын
Outstanding content, thank you.
@Pk3_Garage
Жыл бұрын
This was very helpful. Need to diagnose a P420 on a 07 Toyota Camry. I suspect the Oxygen sensor but need to verify that first.
@joshuastyron4418
3 ай бұрын
Great video. Very well explained
@SEBAS31077
Жыл бұрын
great video simple and easy to understand
@luisr2320
2 жыл бұрын
Thank you for the information great video,
@dougmorris9107
Жыл бұрын
this was fantastic. thank you!
@6romansoldier
7 ай бұрын
Great vid, right to the point.
@SilveradoUSA1
7 күн бұрын
Excellent video 👏👊
@spencerlee9974
5 ай бұрын
awesome explanation thankyou
@BigBriAutomotive
Жыл бұрын
Great explanation thanks
@DS-ss7vl
3 жыл бұрын
Excellent. Thank you.
@zimmbaboo6256
9 ай бұрын
Great video 👍
@aldoladrondeguevara7259
Жыл бұрын
Gave you a thumbs up good simple video where I didn't have to stop my life and watch a 30min vid
@chrishedlund3196
Жыл бұрын
Very helpful. Thank you.
@jeremystice5694
2 жыл бұрын
Awesome video
@rickpena1423
2 жыл бұрын
Dude you are awesome
@jerrypeal653
2 ай бұрын
Good explanation. I use the O2 all the time .
@billmonroe8826
2 жыл бұрын
Well explained!
@raythomas4687
Жыл бұрын
That is as clear as a bell. Thanks
@johnmcminn9455
6 ай бұрын
Great info. It should fluctuate on the front sensor .01 to .09 But on the sensor after the cat Should be flat . I am using spacer extentions
@pontiachotshot
2 жыл бұрын
Thanks so much !
@miman3
5 ай бұрын
Dude I love you
@jasonminato8203
2 жыл бұрын
Hell ya, good info.
@mr.hammer7080
Жыл бұрын
Good video
@don.timeless4993
10 ай бұрын
thank you so much
@zakt938
2 жыл бұрын
Solid video
@Lambros_Stefaneas
2 жыл бұрын
nice video.
@streetchrisg
Жыл бұрын
Great Video! My bank 2 sensor doesn't move from 1.25V. Have a p0158 code 02 circuit high voltage. I'm leaning towards a clogged catalytic converter even though I don't have a p0420 code. I may have a bad ground with a reading of 23 ohms on the ground wire.
@TeamDarnet
2 жыл бұрын
Nice
@markjohnson8162
9 ай бұрын
Great video and we’ll explained I have a psa citreon c4 1.2 eb pure tech reading downstream oxygen sensor reading too high watching that video tells me it’s the catylitic converter
@wvjeepguy8178
Жыл бұрын
2012 Jeep Wrangler- I had a fault for bank 2 sensor 2, so with 130k miles on the Jeep, I replaced all 4 sensors. I am still getting the same p0158 fault code as before, so I hooked up my scanner and the bank 2 sensor 2 is showing a steady 1.275 volts that never changes, regardless of engine rpm or fuel delivery while the others fluctuate as normal. I ran some Catacleaner through the Jeep as per the instructions on the bottle. I didn't expect a complete fix, but I wanted to see if it would at least open the cat up enough to show a change on the sensor data, which it did not accomplish. I'm pretty much stuck now and don't really have the money to replace the cat, especially if that's not the issue. Would a bad wire or corroded ground cause the voltage to stay at a constant voltage like this?
@WellWisdom.
3 жыл бұрын
Thanks.
@deanlhouston
Жыл бұрын
First question, In your video, was the vehicle engine idling or did you have it up at some specific RPM? I notice my post-cat sensor readings look flat during idle but sometimes in the .3mV range, sometimes in the .7 or .8 mV range. But when highway driving (~2200 RPM), it's switching up and down making me think the cat is bad. Is that normal for the O2 readings to behave differently in those two regimes? Second question, how can you test if the O2 sensor itself is working fine and not fooling you into thinking the cat isn't working correctly? I know the O2 sensor is pretty cheap compared with the cats, so guess I can go ahead and swap them out and see if problem remains, but is there a specific test you can perform on the O2 sensor to know if it's the problem instead of the cat? Thanks!
@DM-mm7rs
4 ай бұрын
Same here. I would like to know exactly if he was at a certain rpm or idle.
@Lpzn-us8iq
3 ай бұрын
Did you ever find out what the issue was?
@W0WHERMY
3 жыл бұрын
I am trying to figure out if my B1S1 is bad or if cat is having issues or if something else is wrong. How do I know if the sensor itself is bad? It wouldn't go up and down as much or at all? When my car was idle, my muffler was rattling from the inside and got a P0420 code for low cat efficiency. Mentionned it to my mechanic and he had a look he said baffle seems broken so he replaced my muffler but he was not sure yet why the code and it seemed unlikely that it was caused by the muffler. After muffler replaced, the code eventually came back ( it has been coming and going). And when i rev low (kind of using the torque of the car to speed up) the exhaust gets really loud, kind of sounding like those cheap honda civic diy race cars. Its not super consistent but fairly easy to reproduce. I am going to do more troubleshooting afterwork, but if you have any ideas, let me know. Thanks!
@neodiy
2 жыл бұрын
How is the O2 sensor reading between idle vs while driving?
@WillPower0231
2 жыл бұрын
Would you say there is an issue if the Post Catalytic converter readings are pretty steady but very high? Both bank one and two are solid at 720ish MV…. Pre cat, O2 are showing regular like yours. But I am having severe lack of engine power.
@gang6009
2 жыл бұрын
subbed
@gr2262
11 ай бұрын
I have a 2000 tacoma v6. I recently had a p301 cyl 1 misfire and p0300 random misfire codes. Found a bad cyl 1 injector, replaced it and the code went away and check engine light disappeared. A few days later, I get a new check engine code for p0420 catalyst below threshold bank 1 (my scanner doesnt say which sensor just says bank 1). I get my obd2 scanner and check live data and at idle my upstream sensor reads from 0.00 to 900, fluctuating in between every second like you described and the downstream sensor is slowly fluctuating from 3.254 to 3.300. Not sure what to make of this but if I understand what you're explaining is that my B1S1 (upstream before cat) is working properly and the B1S2 (after cat) is not? Help would be greatly appreciated
@WV591
2 жыл бұрын
wish somebody would do this on wideband O2 sensors.
@Cesarrivera-pj8rx
2 жыл бұрын
👍
@TheSpade83
Жыл бұрын
Have a 2003 explore 4.0 with bank 1 sensor 1 reading between 0.00 and 0.780. Similar with bank 2 sensor 1 and scan tool is reading lean condition on both with a rough idle. What’s your thought?
@sumatrican5990
Жыл бұрын
I’m getting a stft of 99.2 on both banks downstream(stft b1+2,s-2…..99.2 steady) on my ford 4.6 2v 300k miles. Getting rough idle and power loss
@cacus2344
2 ай бұрын
how would the 1st O2 sensor readings be like when there is a vacuum leak near the intake manifold and while idle? should they stuck around 0.02v or oscillate around low values ? (Thanks for the video!)
@arengif
Жыл бұрын
At idle, I get a high O2 voltage (2.9V) from the sensor before the CAT and a normal voltage (0.1V) from the O2 sensor after the CAT. As a result, my STFT at idle is super negative at -20%, but LTFT appears to be normal at 5.5%. I suspect this is what's causing a rough, fast idle (1K RPM) even at operating temperature. I replaced all four injectors on this 2005 Corolla and the roughness improved a bit, but it didn't go away. Can you suggest a possible fix for this?
@hassansmw5634
3 жыл бұрын
Thank you. Great job very informative. one question. Can $50 scanners test o2 sensor voltages? specifically the innova 5210 which I'm trying to buy.
@hunterautomotive4842
3 жыл бұрын
It should be able to
@NURsMec
2 жыл бұрын
Hi what if the catalytic is the one problem. Should expect to see fluctuations graphic or just the flat line?
@gabrielturinici5220
Жыл бұрын
Good video keep on ! A small question, apologies if it has been answered: I thought that the average value of downstream O2 sensor should be around 0.45; or, in your case even for the one working well (S12) it seems that the average is about 0.7 instead of .45mV. Any clue of why this is so ?
@Rusko1DUB
Жыл бұрын
the downostream must be 0.7-0.9, if it high voltage that means that the all remained oxygen are burned in catalyst and the downstram o2 sensor dont depistate oxygen in exhaust and show 0.7+, if it show less 0v - 0.6v then is to much unburned oxygen in exhaust and ecm thinks that the catalyst is not efficient or is cloged
@MustangGuru
9 ай бұрын
Modern cars, the wide band O2 is before the CAT. Narrow band is after the CAT
@siwelinason7598
2 жыл бұрын
I have a Nissan FG10 model, engine QG15 (DE) can I swap 3 wire 02 sensor for 4 wire sensor. If adviceable, what are the connection as it is less 1 wire?
@MiguelSanchez-rb3tw
Жыл бұрын
My upstream doesnt regulate past 400. Only down stream. I have black smoke from exhaust and rough idle. Would this bad sensor cause car stalling?
@user-hq7ff6kx6b
2 жыл бұрын
Hello, my Fiat Bravo 1.6 multijet is showing between 10-12 g/s on idle. I think this is too much for this engine? Also, sometimes the car idle is not stable and the rpm are moving. When I observe the MAF in that situation it is moving on idle between 1.5 - 13 g/s. Will cleaning the MAF with a spray will help? Thanks in advance!
@NoMadMediaProductions
Жыл бұрын
Hey, my pre-cat is fluctuating every 5 seconds mostly hanging in the 0.7-8V range. I’m also getting a P0171 running lean code. No visible vacuum leak after smoke test. What could it be?
@shaharsigal6729
9 ай бұрын
Is it possible that the 2nd downstream O2 sensor also bad (and/or)? I probably would not condemn a CAT before testing the O2.
@steveo3002
Жыл бұрын
could i ask a quick question , my sensor 2 was pegged at constant 1.27v , dash light on , i guessed the sensor was broken and replaced it , now its flickering around 0.1 v or so , so not following your example of a dead cat , could it still be the cat?
@crystrezerex2life
Жыл бұрын
Question concerning a 2005 Honda Accord 3.0.....v6.....my bank 1 sensor 1 is barely reading 0.04 mili Amps.....and bank 2 sensor 1 is reading the same thing!! Is this the reason why my fuel trim is off? Computer tripped a p0171 code .....lean condition.
@tombuckley3061
5 ай бұрын
2000 express 5.7. No check engine light. On a long pull hill o2 show good but engine stalls progressively worse as the van goes up the hill. New cats and air flow sensor. Like not getting gas. In use of scope what should I be looking at.
@randybrown6449
3 ай бұрын
I have a 0420,0430 codes on my 2014 Infiniti QX80 and I was using my Autel Maxicom 808 trying to diagnos if I need a catalytic or 0/2 sensors my air fuel volts were the same on each O/2 sensors bank 1 /2 was 1.2 and Bank 2 /2 was the same.And Bank 1/1 and 1/2 was the same .28 what can I look at next to find the right readings if those are not it
@canuckfixit7722
5 ай бұрын
On my scanner hooked up to a Honda Element, I get O2S B1S1 in mA and Lambda B1S1 in a unit-less value. How do I compare with readings like yours in mV?
@jamesfaison9410
Жыл бұрын
2014 Hyundai Elantra 1.8L Consistent P0420 code While looking at Sensor 2 reading, while driving on the highway, the voltage does switch some down to 0.1 volts but at idle it stays at 0.7 - 0.75 volts Also, while driving at highway speeds, when I take my foot off the accelerator and let the vehicle coast, the voltage goes to 0.000 volts and stays there until I push the accelerator again. I'm unable to look at the upstream voltage. I'm using Blue Driver and it says the PID is unavailable I'd like to condemn the post cat O2 sensor but I don't think I have enough evidence.
@brucelee9891
2 ай бұрын
Great Video. Thanks! Quick question: , if Cat is plugged at 3:00, why it(O2S22) fluctuates? Thanks.
@_UserUser_
3 ай бұрын
What I don't understand is, when the Toyota corolla 4afe manual says that you must measure 8 or more fluctuations in 10 seconds . Does this means that you must count how many times it goes to 1volt as 1 fluctuation, or should you count the up and downs as 2 fluctuations? I mean, does an up and down circle, means 1 fluctuation or two?
@eurotrash55
5 ай бұрын
You can further verify cat performance but checking the temp of the exhaust pipe before and after the cat. Exhaust temp after the cat should be much cooler on a properly working cat. If the temp didn't change much, the cat definitely isn't doing it's job. That's a second test for confirmation.
@jerryt8116
Жыл бұрын
How do you know if catalytic converter is bad or 02 sensor?
@99tahoelt
2 жыл бұрын
In this example did the Bank 2 O2 sensor throw a DTC. Chasing a P0300 on my 07 escalade and I'm thinking of replacing the O2 sensors but I have no O2 codes pending or current.
@GripFreak
Жыл бұрын
Scan tools don't identify faulty or bad components (parts). TEST don't guess. Best wishes!
@nyccorvette
2 жыл бұрын
i have a condition on my 2001 C5 in which the O2 HTR is not ready. I ran the scan as pictured in the video and my readings for the O2 sensors behave similarly. My mechanic thinks the heater in the downstream O2 sensors are bad. Any thoughts on how I can check further?
@hunterautomotive4842
2 жыл бұрын
How long does it take on your scan tool for it to say that it is in closed loop? The whole point of the o2s heater is to get in to close loop as quickly as possible, so the sensor can still be working fine but it might just be slower to get started.
@chucksteak4054
Жыл бұрын
I thought stoichiometric readings only came from downstream o2? I have a sienna with pre cats, and the readings fluctuate but stay roughly the same number
@smorrow0816
3 жыл бұрын
How would you know if you had a bad rear o2 sensor not doing it’s job or if the cat is at fault not doing it’s job?
@mahasish
4 ай бұрын
Good question. Hope somebody who knows the answer can reply.
@nordicpride9708
Ай бұрын
Perform a propane test. Scanner danner discusses this in several videos and in his book 👍🏻
@bestclipevermisaq5598
2 жыл бұрын
Hi what is a normal reading number for bank 1 and 2? My car getting .267 on bank 1 sensor 1 and .675. Flat And same number on bank 2 But still have p0429? Can you advice
@smorrow0816
Жыл бұрын
How would you determine if its the cat vs the o2 sensor that is bad?
@hectorsanchez1960
Жыл бұрын
I have a Ford expedition 2002, V8 5.4L I replaced a pipe under the intake manifold, a heater hose connected to the water pump, change new intake, replace spark plugs, coil packs, O2 sensors Now I have 2 codes p1152 and p1132 took it to get it diagnosed. I need to replace both front oxygen sensor first and erase the code. Run car until code turn off if the code comes on again I’ll need to bring it to dealer and replace computer.
@josephearl7983
17 күн бұрын
My Forscan reading shows bank 1 sensor 1 reading in Current mA or Imped V. I don't have a reading in mV like your scan tool shows.I'm getting a P219A code, Lean bank 1, and the mA reading goes from 0.00 to -0.11, and the V reading is 1.02 to 1.01. Does this indicate a bad O2 sensor? Thanks!
@ernestdiaz7801
3 жыл бұрын
I am new to the scope diagnostic procedures
@KINGRG1
2 жыл бұрын
Can an O2 look normal percentage wise on a scanner but still be bad?
@mAKtre47
Жыл бұрын
How can you tell from number data that a sensor is bad?... 2003 camry sensor 2 while driving drops to 0 especially while accelerating is that normal or no? Getting a p0420 code just trying to rule out everything before replacing a cat
@davidlanatti227
2 жыл бұрын
Hi, I have a ‘97 Ford 7.5 gas engine with 96k miles. All of my monitors have completed except the catalyst monitor, and I have been through 90 gallons of gas driving around trying to get that completed. I have a pretty good scanner and the reading look normal for the two pre cat and the one post cat, but it’s not completing the cat monitor. I checked the temperature of the inlet and outlet and they’re about the same temperature, around 400 f. I also have a recent pre test from a check station that shows excellent exhaust readings, but here in California you have to have all the monitors completed. I’m at a loss of what I can do. Do you have any advice?
@hunterautomotive4842
2 жыл бұрын
Have you looked up the drive cycle for that vehicle? It gives specific steps to do to get all the monitors to run.
@davidlanatti227
2 жыл бұрын
@@hunterautomotive4842 Yes I had looked it up and tried it but actually I found out that we are allowed to have one unfinished monitor, so I brought it in for the smog check and they put it on the dyno and it cleared. Thank you.
@ILIKE2FIXSTUFF
2 жыл бұрын
Is it normal for it to be zero volts while driving? Idling drive like not accelerating but driving.
@briansturgill5905
Ай бұрын
I have 1 downstream steady at 0.6 and one steady at 0.1. Does that mean the low one is bad. It sometimes goes up in voltage but rarely.
@timothyyergens7125
Ай бұрын
I have a 02chevy 5.3 I have fixed the exhaust manifold leaks and change all of the o2 sensors and catalytic converter on bank 1 because I keep getting p420 code. Not sure exactly what to do next
@jasonminato8203
2 жыл бұрын
Question, so my o2 sensor is just staying at 0.02v at idle, it can jump to a max of 4.9 when i rev it, so the data it's sending is faulty, but my question is, are there other factors that can make it rub such low voltage on idle, this is the pre-cat o2 sensor.
@hunterautomotive4842
2 жыл бұрын
What vehicle is it on?
@B0bik
11 ай бұрын
So, if the voltage would jump between 0-0.4 it would be lean if 1-0.6 it would be rich if its jumping between 1 and zero avarage is 0.5 which is best A/F ratio. Do i get it right?
@demetriusrussell3261
Жыл бұрын
Dumb question. My acura/integra is running o2-precat: 590-1280mv and my o2-postcat: 140-180mv. If I'm understanding the video...my cat is functioning correctly...do I have that right?
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