Car Corner: O2 Sensor Diagnostics

[@stuarttener6194]

Dear Professor, I am from Philadelphia myself originally and was glad to see your video. It aided me in understanding the issues I had with my vehicle (Ford 2015 Police Interceptor Utility). In the end I ordered the proper part online and paid a shop $50 to install the O2 sensor for me (as I had neither access to a lift nor a jack that could get my car up high enough for me to use a breaker bar to remove the O2 sensor myself, even with the proper O2 sensor removal socket in hand). Your video is highly instructive and well appreciated in no uncertain terms and thank you for effectuating its publication.

[@padrigrussell9899]

Very thoughtfully presented. I'm 71, retired and considering taking a auto mechanic course just for edification and fun at our local CC. Hope they can do as good a job expounding as you did. Thanks

[@stanleyroberts6669]

You're another youtuber is talking through half of the video. Show how to remove it at the beginning. Nuff-Said 😮

[@GearMaven]

So well spoken...too many folks riddle their presentations with "you know," "uh." Very thorough and easy-to-listen-to talk.

[@pamelaburks220]

Op

[@arthurthomas6874]

@@pamelaburks220 pp

[@georgewilson2957]

Excellent. While you did say pin # 4 after reading it correctly as pin #2, you correctly re-checked the reference page and did exactly choose and say you chose the pin #2. You said pin # 4 once but you said and used pin # 2 twice and correctly. Someone mentioned this thinly a while ago. I know that you chose the right one and you double checked the info as you proceeded so I saw and heard an excellent mechanic being careful and rechecking the reference info on the fly. I work on my vehicles and occasionally help others(never for pay) and I warn them that while I refer to myself as a mechanic by experience, I have had very little actual training. I am in Texas and am too far and too old to get to your class and I very much regret that. This is my first viewing of one of your videos. I subscribed immediately and I hope to find more. WOW, way to go Dan Reed.

[@nathanmayo7101]

Having spent 4 years in college and 4 more in dental school learning my craft I must say you are one of the best teachers ever. I fell into this by accident and watched the whole thing just because my check engine light is currently on. Thank you so much. Now I feel like I can speak knowledgeably with the tech about my car problem when I take it in. Good job, Car Doc !

[@keithmorton-macphail5832]

Like everyone else I thought it was an excellent demonstration video too! Key thing for me is your emphasis early on in the difference between professionally qualified technician and others (accepting that experience is important factor) - cars are sophisticated and require techs to be deep thinkers/analytical in their approach and able to reflect on their practise to complete differential diagnosis and subsequent interventions with the great technology available to support this. No surprise, I was a health professional for over 32 years before deciding to study Automotive Engineering. Codes, standards of practise and ethics come into play. There are alot of similarities where its a person or a car (and its owner that you are helping). KZbin and these high standard videos have really helped my learning.

[@robertodezaldo1662]

This must be one of the best and explicit videos on the theme that I have seen. This person is great at teaching because he really knows the science behind the theme. Great video!

[@makantahi3731]

20:43 and if o 2 sensor is stucked, socked will expand and skip over hex, so you need to use quick release from bike seat post to fix it

[@digihz_data]

Simply the best O2 senor video I have ever seen.

[@jgrm4443]

I am not an auto tech, and either a DIY guy. I watched the whole thing because you articulated how to use the diagnostic tools to fix the check engine light very well. I also noticed 559 thumbs down. Not a surprise. I think I know the reason. See, It is not you're wrong. It's because auto "stealerships" (dealerships), and crooked shops don't want you to educate the people they have been robbed with unnecessary and unjustifiable problems they occasionally made up. For one real issue found, they would have to make up two or three more to generate revenue. You're also going to receive some thumbs down from those who can't analyze or can't think outside the box. Good Job! Keep it up!

[@brentwalser131]

Outstanding Sir. Clearly you've played a structural role in your Automotive Academia with helping our nation's youth secure employment.

[@nutlange6910]

Brilliant explanation, thank you Sir. If you don`t know about O2 sensors after watching this video, then I don`t know what will help you. The best video on the subject I`ve found so far!!

[@arniel.9424]

I'm new to mechanic and learning one step at the time. This is such a good video, thank you very much for explaining in details what is an O2 sensor, its different parts etc . I will surely watch other of your videos !

[@twig3288]

38:59 "If I go between pin 1 and pin 4"; then proceeds to connect pins 1 & 2 Other than than minor bit of confusion it's a fantastic informative lecture. Many thanks.

[@DIRTYDOZEN62]

Retired English mechanic, left the trade after 40yrs before all this stuff really took off. Try to stay updated and videos like yours are so great. You remind me of one of my college lecturers back in the sixties he had a real passion for his subject and was able to inspire all us would be mechanics..Great video thanks so much!

[@MrBerksboy]

I cannot believe how good this guy is and how interesting and knowledgable he is to listen to, i practically know nothing about cars but a novice could easily become confidant around an engine after listening to his teachings, superb, i am so pleased i came across this web page :)

[@allenmundorff3941]

I am a firm believer in using antiseize. You may think this is overkill, but I will if possible, clean the threads in the exhaust pipe with a welder's pipe brush and apply a VERY thin coat to all the threads. I also apply a VERY thin coat to all the threads on the sensor. And like Dan says, don't let it get on the sensor. I have friends who know where I've been because everything was so easy to take apart. Also, when you can't loosen a sensor with conventional methods and a torch is not practical, I have used an 8 or 10 inch pipe wrench after soaking the threads with warmed up PB, which is more chemically active.

[@wamulumeimasiku7858]

Clearly illustrated... Naturally gifted teacher.. You should consider it as a full time profession!

[@lostsoul3154]

Great video, Dan! This is why getting a car fixed these days is expensive. This is the right way to fix an engine light. Taking a test drive would be suggested, as a final test.

[@varunadesilva2930]

I just came across this video accidentally. My goodness wasn't I glad I did. Well documented & illustrated fault finding & understanding about O2 sensor. Top man Dan. Well done.

[@claudiar8575]

I have very limited knowledge and appreciate this very detailed lesson. Anyone sitting at this guy's automitive class/classroom will surely learn. Thank you!

[@erastusanyasi2032]

Am not a mechanic or engine enthusiast, but because on 2 occasions my Nissan developed this check engine with P0420, i am so informed right now. My local mechs will not lie any more especially on codes that are logic based, Thank you so much for the educative video. Will return once i buy new O2 Sensor

[@MotivationalChannel1977]

Absolutely wonderful video. Very informative, I would give 10 stars. I have no words for this professor. I wish I could learn more about car repairs from this professor. Overall, Thank you so much for your time. I will definitely follow and watch more of these videos.

[@junesantos543]

An avid viewer of your channel from the Philippines, really much appreciated listening/watching step by step process of diagnosting car engine troubles/repairs in an accurate manner..as you said not just like the sideroad workshops... I've got Hyundai 2010 Sta Fe 2.2L crdi.. Trying to diagnosed since the check engine light on appears on my panel, my SUV consuming more fuel for almost a month now compared to past number of years consumptions??.. Just trying to get majority opinions from legitimate experts like yours... To avoid those so-called experts to extorts cash from customers.. Really really appreciate very much your lecturing video, thou it's unfair to those students of CCP who are paying fees to learn from your school, yet you're providing the lesson free globally... Lot of Thanks to all the people involve for making this channel...

[@user-kb9eh7dx8y]

The video helps thousands of people all over the world , the students learn much more than the subjects on these videos .... Good well made video ... thanks from Wallington London ...

[@gracedayrit5566]

I

[@MrNandiuxx]

Man I can only say something, this video is the best of the best telling us the most complete class about the Oxygen Sensor, and everything clearly explained with easy understanding words!

[@rgagnon6402]

I am a french speaking person, one beginner and I agree 100% with you

[@billysprague9852]

91 ford explorer 4.0 IT WILL IDLE SMOTH THEN WHEN YOU GIVE IT GAS IT WILL FALL ON ITS FACE AND DIE

[@RichadTheLionHeat]

Absolutely excellent, outstanding, informative, educational, helpful, well organized, superb instructions.

[@corinnecontino3504]

I just subscribed and gave you a thumbs up! I'm a woman and I'm always helping my friend who is a mechanic. We were watching your video and I Love your style. Most important, Thank you for your help! Blessings to you and your family!. Corinne & Kevin.

[@judykanary4393]

To everyone who is commenting about this guy talking to much well that's because he loves his job. !!! He is eager to help people. I can tell he just wants to make sure everyone understands about what the check engine light does. Some of us like myself a woman who have no man around the house need a full lecture like he is giving. So if we have to take it to a mechanic we don't get well you know. Because I have been just like my transmission. The guy told me it was my transmission and it could not be rebuilt. I didn't know that. He also told me he would have to order from California I live in Texas and it would take a few days to get to his shop. Keep in mind he had not even took the transmission down. So I gave him the okay I had to have my car for work and would you believe the next day he called and said my car was ready.??? What happen to the 2 or 3 days shipment to his shop. I believe what he did was took down my transmission and it was a minor repair and fixed it and charged me for a transmission I just wish I knew if there is a way to tell if I have a new transmission on my car instead of the old one still being on there. I know its the same transmission. So Thank you for detailed information because I have no idea of car mechanics and after this video I am now well informed. I am going to attempt to fix my own oxygen sensor. thanks

[@nicenonya3]

you should be able to see if you have a new/clean transmission or not,take it to a shop and have them check it.

[@crisismanagement2442]

The ONLY way to be sure that parts have been replaced, is to state at the outset... "I want ALL old components that have been replaced kept, so that I can examine them." Most dealers won't carry old parts - just in case - because they'd need a shop full of junk... So the likelihood is that they will assume you know what you are talking about, and minimize replacement parts...

[@gordontrainer]

Judy bug love all the talk

[@petertoussaint]

❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤

[@Purcell62]

You speak slowly enough for people to catch what you are saying. And, you enunciate clearly so that folks like me can speed up the video to 1.5 to go faster. But, I can still understand everything you are saying, simply at a faster speed. I like your style of teaching. I will look for a video from you for future problems. Thank you very much.

[@billpiech7564]

Dan. One of the best presentations I have seen. Everything was explained in simple terms. My mechanic told me I have a problem with the heater circuit in O2 sensor past the catalytic converter. So what I'll do as a quick check is remove it, get a wiring diagram from Bosch and check the resistance of the heater coil. My mechanic says he doesn't mess with that stuff. I don't know why. That's why I took it to him. The thing is I just replaced that sensor not too long ago. I talked with the man at Bosch and he's going to see what he can do for me if it is the heater circuit. Thanks for the help. Bill Piech Raleigh, NC

[@TheHeatingEngineer]

A very good video, especially with the practical test of the sensor and then the diagnostics tool demo. It appears that my Honda Jazz (UK) has suffered sensor failure which I suspect has been troubling the car (and me!) for the last few years. The practical test showed a heater resistance of 15ohms which I think is too high; this only heats to 10watts at 12volts which I think is too low. And the sensor output is 7mV which also appears to be far too low; I used the same blow torch test as you did. I feel more confident now to use a diagnostics tool to confirm the sensor status. Many thanks.

[@anneda277]

Loved the video/training! One of the best free college classes i've ever had!! You have no idea how much this means to people who can't afford expensive car care or training. This is what giving back to the community, help others is really about. Thank you so much Sir!

[@carolinekimhulse698]

I've watched alot of car repair videos and yours by far was the most thorough, clearly stated, accurate non bs best one i've ever seen to say at the least. Thank you so much! Keep up the great work!

[@RichadTheLionHeat]

Absolutely excellent, outstanding, informative, educational, helpful, well organized, superb instructions.

[@amandavarley7971]

+l[

[@waitingforparts57]

Just found this video and the entire playlist. I am very fortunate to have found your work. May you be safe and well

[@glennoc8585]

Many earlier cars, pre OBD2 don't have flashing engine lights, they just illuminate. I've soldered quite a few O2 sensor wires with no issues just make sure your wires are cleaned well and you get a nice wet looking solder and heat shrink insulation

[@johnpilkington132]

Excellent explanation and instruction Dan! Your performance in front of the camera is extremely competent with no attempt at being an internet "star", which for me, will now make me watch many more of your videos. You are a STAR! :-)

[@296newman]

The kids under your tutelage in Philly are privileged to have you as their leader, Professor Reed. Thank you for your dedication to preparing the next generation of what used to be Mechanics, to be Engineers of Vehicles-as signified by the patch on your shoulder-and are now a vanishing breed. I am a Master Mechanic from the '60s, and licensed Aircraft & Powerplant tech, because I'm a Commercial Pilot. The root of the problem can be seen in the inane snipe below. Perfection comes at a price; all cost time. In this single video, concerning a critical element of every gasoline-powered conveyance, could become the viewer's ticket to fame and, yes, fortune. What would you have shortened, clod Criz??

[@observersnt]

Excellently produced, clear, audible speech, straightforward, sensible. This is a very helpful video. Ok its a new, clean car and in real life most sensor replacements will be on older cars and many sensors are in much more awkward places and you referred to that possibility, but the use of a new, clean vehicle made it very easy to see what was being done. Well done. Thank you. Andy in the north east of England

[@dichhssaini8724]

أبرياء ديكنوستيك ديلي

[@danarussell5063]

I thoroughly enjoyed your informative lecture and diagnostic method. I followed it with my iPad on my workbench to diagnose, test, replace, and verify a faulty 02 sensor. CEL is off and I am back on the road. Thank you!

[@johnthomas2620]

This Prof. has done an exceptional job with explaining the nuances of troubleshooting and diagnosing the problem. I wish I could be his student. Great job!!

[@bradmarcy]

Dan, you are the man. Technical and to the point. My GMC has a bad O2 sensor. Not too worried about it yet but it does need to be assessed. Your video gave me much insight i what I need to do. Thank you!

[@mikegarcia5087]

I must say this is a high quality vid for 02 sense diagnostics. Good job, Dan!👍

[@bernardmccabe5390]

Done very professionally , Thank u B M

[@tonguy217]

I really enjoyed watching Dan. This guy knows his stuff and does it right

[@z3phyrdok]

One of the most informative videos I've seen yet.

[@Kinstonjin]

Love this presentation. This CCP video very helpful for beginners. I graduated from PCC( Pasadena City College), major in automotive technology. Now I’m truck driver, used to work for Mercedes dealer for over 20 years, specialized in automatic transmission overhaul. Can’t handle it anymore due to state of the art model come out.

[@dirkalan1]

38:53 you say pin 2 and pin 1 per the diagram then say connect pin 4 and pin 1 at 39:02 then you connect to pin 2 and pin 1??? Which is it instructor?

[@williamm6446]

Very well done. A professional Auto mechanics teacher. Easy to follow and understand. Thank you Sir.

[@frankvasquez1387]

Senor Reed, you are definitely an excellent instructor and I love the way you present and clarify this very valuable information regarding 02 Sensors! Love this video and this is by far one of the best videos I have seen and love the way you explain and simplify the steps and procedures you are taking in completing this type of diagnostics! Keep up this great work and I'll be looking forward to all your future videos! Happy Trails, Hasta Pronto!

[@stanleywijohn9355]

B

[@williamvincentjansen5543]

Best ever I had, I just loved the presentation, took time, didn't bypass any process and gave all the necessary info and reasoning.

[@FisherCatProductions]

A few other things to try if everything in this vid fails to break it loose (a GREAT vid, by the way): 1. If you are not going to reuse the old sensor, and have cut off the wires DO NOT USE A SLOTTED TYPE SOCKET! They do expand enough to slip and round off your hex if you put enough pressure on them! Just use a regular 7/8", six-side socket if you cut the wires off. 2. A slight variation to the vid, where he heats both parts: try heating the mainifold only, as much as possible, getting as little heat on the sensor as possible. Heating them both will cause both the manifold and the sensor to expand from the heat. The ideal situation is make the mainifold threads expand MORE than the sensor threads, breaking the bond more easily. 3. If that doesn't work try it again. This time when you are done heating, wrap a damp rag around the sensor (keeping it away from the manifold as much as possible) to contract the sensor threads. Try again quickly. 4. If these don't work, heat the crap out of the manifold AND the sensor until everything is as absolutely as red hot as you can get them, then douse everything with water. The intense and rapid contraction might break the bond. If you try enough things, enough times with heat, it WILL come loose. You simply have to break that bond between the threads. Just don't give up, and don't round off the hex or you will have a whole other problem. Again, nice vid. Do as he says once you have the slightest movement. Lots of oil, lots of patience, back-and-forth until you work past the corrosion.

[@thomasbrooklyn1820]

Persistence pays off.

[@Randsterone1]

Great performance. You stayed on track and got to the meat and potatoes of the diagnosis. I'm sure this will help me in my journey to track down the issue with my truck!

[@jonnygarland4741]

Hey it takes a lot of time just to explain a O2 sensor really you did a perfect job explaining IT its a lot more work than what it really looks like but that's the difference between a good technician and a backyard mechanic excellent work thank YOU. YOU DID a great job explaining exactly how a O2 sensor really work's

[@harrisjohnny477]

Now I know what they're talkin about when I'm reading and it says lean code. When they mention fuel trim. I always read it but I never understood where it actually stands for. Now I do thank you. You are truly an educator thank you for choosing this career.

[@danjreed]

Thanks so much for the kind words!

[@Videouploader248]

Hey Dan you seem like a good guy who likes to share honest information to other people. Thanks..

[@cardoctor1959]

Very knowledgeable person, but when I noticed his teaching should have included in how to clear the keep will add memory in computer and the reason for doing so. I was senior master with Ford, master with Nissan, and Subaru etc. We were always taught to do this with these manufacturers. As a retired technician I try to stay refreshed and this gentleman is a very good teacher and I'm very impressed with this program. Thank you.

[@oscarrodas2016]

Very, very informative. I like the side talk that supplements the information.

[@davidgiraitis2320]

I was looking for a discussion of why the O2 sensor might not respond to drive cycles when attempting to get I/M readiness. I have no engine faults, but several careful drive cycles failed to get the O2 sensor to readiness status. All other sensors, including the O2 heater sensor, are ready. Before I go to the trouble of replacing 4 02 sensors, I would like to find out what other options I might have or tests I should run. This is for a Chrysler system. BTW, you are an excellent teacher!

[@annehopkins3393]

Oh, he's a professor; no wonder he presents so well. No ums or hesitations, a pro. I love how he compares the decimal millivolt reading to a dollar/money number ... helps people catch on quicker LOL.

[@phinphan7358]

Hi Dan had to pause it at 18 minutes in to add the main reason you do not attempt to splice a o2 sensor wire is because you can change the resistance in the wire and that will greatly effect the 1 volt to .1 volt reading affecting air fuel ratio mixture. Also like to point out that as you said never cut the wire past the harness connector but as long as you are replacing sensor YOU can unplug from harness and cut wires at o2 sensor making it easier to get box end wrench on it. I have a special tool but sometimes you can not get it on and some can be a real bear.

[@danjreed]

The main issue is that most O2 sensors use stainless steel for wiring, which can’t really be soldered well with over-the counter typical electrical solder. That in turn can lead into the voltage drop issue. But I totally get what you are saying.

[@drfuturemk]

WOW! I have watched many videos for repairing my car. This one is the best and most informative I have ever seen on KZbin!

[@shanabolden8012]

L

[@shanabolden8012]

L

[@disol1734]

I noticed at 39:02 , You said measuring resistance between pin 1 and pin 4 for the heater , it should be pin 1 and pin 2 which You eventually did .... anyway thanks for the great video on O2 Sensors ...... 😊👍

[@johneagar2067]

Absolutely brilliant! Thanks Dan, you have an excellent way of explaining things in simple terms. I really appreciated it.

[@geophreymwakasyuka3825]

Really

[@jeffduncan6825]

I didn't look through all the comments but I was curious so you think it would be smart to put some on the threads that are in the exhaust itself this would eliminate the chance of putting it on the actual center part that heats up I would think if you're careful and take your time by the way great video very happy I found it able to explain to the girlfriend and others on how this sensor works now

[@danjreed]

Toyota is one of the few (only) companies that has an O2 sensor that is that style (with two studs) rather than a bung style. I prefer the bung-style design, to me it seals better. At least I think that’s what you are referring to - www.theymightberacing.com/Images/Corolla/O2Sensor/O2Sensor002.jpg

[@Alegihanagan]

Excellent! Easy to understand, especially for the not technically or mechanically inclined. You had my undivided attention. You being a professor I expected no less than the best!!

[@peterbamford2811]

Excellent work

[@eesbeam]

Wow! By far the most complete and accurate informative car diagnostic how to video I've seen. And i've seen hundreds. Thanks dan, for your most complete 02 explanation and detailed information and education. Its the exact information I needed which i didnt quite completely get with many other vids like this. bravo.

[@janbo1224]

Thanks so much for this video! It was very informative and helpful. You are an awesome teacher!! The kids are lucky to have someone that clearly explains, and teaches how to diagnosis, then how to properly complete necessary repairs.

[@matheosantoniou8783]

so well explained finely now i know how an 02 sensor works my friend you did an excelent job and i am proud to have found you thanks to KZbin keep it up we need more people like you geat job.

[@chelsea7xhf]

Great video, I am a new O2 sensor warranty engineer at Ford, I am actually learning a lot from the video! Really appreciated the content!

[@joehyundaitech7961]

Dan Reed what a fantastic teacher you are I enjoy watching all of your videos

[@Mattthemangler]

Amazing presentation laid out clear and concisely. Incredible teacher fantastic job. Thank you

[@mulengakingsley3000]

Thank you so much Prof. for this educative and informative illustration of the subject. When shall be the next hit?

[@autopilotone4]

Brilliant video Dan, I learnt heaps about O2 sensors. Keep up the good work!

[@harristylissanakis1510]

Hi i had a head gasket burned out due to water leakage.Since then i repaired that engine but after that i had engine yellow light to comes on & off engine was running roughly.I replaced that engine with an other one with 60.000 km ,but the problem exist !! the computer says Number 4 th injector problem.Replaced No 4 with a new one ,still i have the same problem .the last two days the yellow eng.warning lite is stady ,but the time it starts to goes off & on engine lose power like working on 2 cylinders!!!!...Any idea what going on with that problem????? thanks a lot for your time

[@monicohernandez9455]

If we have so much troble with flat conector why no makend round ???????????

[@pipertec]

Dan, you the man....I followed you instruction too the letter and fixed the bad bank 1 sensor 1 in my b2300 Mazda 2.3 liter. Thanks so much for the attention to detail

[@rosemaryrobartes1743]

The best way to check if the lambda sensor is functioning is to set the engine revs at around 5000 rpm , go to the rear of the car and take a big long sniff of what comes out of the tail pipe . If you pass out immediately it's not working , if it takes 5 minutes to pass out its working fine !

[@leesire]

Rosemary Robartes too freaking funny.

[@adamgonzalez4393]

Lmao😂

[@shanlee2773]

Q: Why not direct measure sensor heater wires before take it out? As the sensor is a messenger which means it could be something goes wrong instead of the sensor itself. In that case we save the effort to plug it out?. Or something I misunderstood here?

[@gyybolinger404]

@@leesire ¹

[@billbezek416]

Excellent Job!!! seriously !!!! You need a raise! I now fully understand how to fix my o2 sensor issue. Very impressive!

[@OlTrailDog]

25:30 Actually we have thousandths of a cent not hundredths of a cent regarding millivolts. Exceedingly good video presentation: quality video, great tools, and smart, well spoken, experienced, qualified technician.

[@moeyy2199]

Top video !!! So good so thorough, however would be nice if you gave an idea if you got the o2 code but the sensor wasn’t the issue besides the vacuum hose

[@yomifalade]

I have watched several videos on fixing the engine light-on problem for Toyota 2003 Corolla for I have had the problem for many years. This time I changed my mechanic to Shell service station, Bellerose, NY 11001. He tested the engine with the diagoniser, and changed the top mount gasket, and that immediately solved the p0171 and p0770 problem. The engine light-on has been off since then. You may want to try this solution.

[@tomas7158]

Great Dan Reed. That was an good lessson about the o2 sensor. I have to check my vaccum slang when they didnt find whats wrong. My guess is that 5ohm element is broken but i have to hook it up and read. If not i might check the ohms. I havent noticed any issusis when runing or fuelconsumption. It comes and goes but now its stayed lit. So its time now. And yeah it was at the car dealer. And i did phone in at first. But its hard to find any wrong when its working excelent. Thanks.

[@jackmatie8444]

Thanks Dan very informative video and great presentation

[@genowilliams6261]

Top shelf instruction. Thanks for the clear diagnostic approach to finding what is wrong with oxygen sensors. Excellent presentation.

[@scox1984]

I left the room for a bit and came back to this.....I watched the entire video and I don't even really care about oxygen sensors. You're an absolute legend!

[@rkvt]

Nicely done. A bit long on the front so a note in the description to start at 5:00 would've helped. Still, great information on a logical and careful approach. I liked the evolution of the sensors bit as well as the diagnostics. I thought it was funny that they didn't edit out the repeats.... just a few. VERY NICE WORK, all!!

[@franciscomaldonado8892]

I like your presentation, well detailed.

[@mehranbehdjat1702]

Thanks Dan, very good presentation. I hope you have time to respond. I bought a 2004 fx35 last year and it failed smog check for P0138 and P0158 which are the post CAT o2 sensor issues. I went ahead and changed them both and I found out that it made no difference. When I delved into it a bit more I realized that all 4 o2 sensors once in operating temperature just show a steady voltage, the post CAT sensors go to 1.275 volts and max out, and B1 S1 is at .3 V and B2 S1 is at .64 with .01 v oscillation. When I accessed the ECM to see what is going on, I found that someone had simply joined the wires between S1 and S2 on B1 (and not B2). For the life of me I cannot figure it out why would anyone do that and why would ecm accept this. BTW, the car runs smoothly and aside from the "service engine soon" light on there are no issues. I also verified all 4 o2 sensors they are fine, even the original sensors that I replaced were fine. Anyone out there has any idea what is going on. I hate to revert it back to what I think it is supposed to be and find out now that the car is not running smoothly anymore. I have to point out that mileage is not that great 14-17 mpg. I unplugged B1 S1 and drove it and it still worked but not smoothly, it got slow to respond to acceleration.

[@firstnamesecondname5341]

40:00 I was almost at the point of thinking you where going to further diagnose and then repair the heater of the sensor. Amazing video 👍

[@TomFields-d3o]

Your video saved me a lot of worry about HOW to remove the electrical connector and wire of the O2 Sensor from the frame

[@Channel-hl5mt]

Wow you’re a great teacher. Thank you

[@markowease9947]

This is my first time catching your video. I must say very well put together sir and informational and detailed. Exactly how a proper tech should explain to a customer and or students. Outstanding!! Thank you very much can't wait to see more of your work. Keep up the great work.

[@amazoidal]

Snap-On makes the best 7/8 Sensor Socket. It's thin wall so it will work with sensors that have heat shields.

[@robsonbass6058]

I had a 1980 Dodge d50 pickup and the Mitsubishi equivalent. Both had an exhaust manifold with a built in cylindrical catalytic converter in the two piece exhaust manifold. I took both out and used a screwdriver to break up and remove the guts of the converter in both. Drastically improved performance of both trucks. I converted one into a convertible. It was a cool thing back in the day. FWIW, I had to do the first one because, when I checked it, the top had been melting like pudding. The makeup of the thing is like a 3D screen. That is, instead of the holes being tiny squares, they were tiny tubes, about 6-8 inches long, IIRC. But so many of the tubes were clogged from the "melting" that it created massive back pressure. So I got rid of it. :) This was in the Seattle area. They still passed emissions tests. It was also around the late 80's.

[@bbaaspencer1]

Young people today won’t care to fix or do anything, they just pay someone. I’m a senior citizen and making more money today doing simple tasks on cars and around house than I did on my full time job, prior to retiring.

[@Michaelc3094]

Show me the ways master I'm a struggling auto tech student

[@claireh.7605]

Yes young people today make $300,000 a year with a few clicks in Excel and on their computer

[@AsjadSiddiqui_MAGU]

I’m 17, I care.

[@pjohnson9436]

@@claireh.7605😂you right

[@claireh.7605]

@@pjohnson9436 literally my cousin

[@saeedahmedsolangi7410]

Firstly I wondered how a technician could be explaining like a professor; but vow he is really a professor!

[@chughtaimb]

Great video except when finding PIN numbers to check the resistance/continuity, you read right from paper but said incorrect pin #1 &4 instead of #1 & 2 and while actual testing both old and new sensors, you used correct pins #1& 2 where old found open circuit (L) and new one measured 3.7 Ohms. You may want to correct your audio on it.

[@chrisgmtech8421]

i also noticed that haha, great demonstration

[@lisab3396]

Bashir, although that may be the case, it is a minor typo hardly worth the mentioning. Anyone getting into this kind of work should use their specific technical specs and choose the correct terminals without issue!

[@1and1makes1]

Really? I think it's a significant enough error to mention and really has nothing to do with how sharp you are or aren't and/or your enthusiasm or lack thereof for the auto repair industry you're either employed in or not. It was an error. Errors should be corrected. Period. Good eye/ear Mr. Chughtai. 😉

[@Robguerr77]

Great video I was doing my own diagnosis on o2 sensors but had doubts and now I don’t unfortunately I have a p0420 code with a replaced cat that is still showing faulty car still needs to be checked for exhaust leaks downstream sensor has been replaced but not upstream I’m hoping for a solution without breaking the bank any further.

[@carrollvega360]

I want to thank you Dan Reed for the information you show how to diagnostic 02 sensor I be able to fix my problem in my car

[@raystargazer]

The troubleshooting steps to check the sensor were appreciated. Very easy and quick. Thanks.

[@kensimon]

Covers all the bases. Good !

[@MichaelFazio-ys8ly]

One of the ground wire is is shielded to absorb sny electro_magnetic interference.

[@handicapitation3250]

Start at 5:48 if you don't wanna hear a 5 minute lecture on Check Engine Lights.

[@chishagregory9414]

I am happy to learn from your video about oxygen sensers.Alot of mechanics don't know the functions of sensers on the petro engines.This great.