Wideband O2 sensors, Narrowband O2 sensors and Fuel trim.
2018 ж. 18 Ақп.
268 117 Рет қаралды
In this video i diagnose a car with fault codes caused by a bad Wideband O2 sensor.
While we diagnose this fault let's talk about;
Wideband O2 sensors, Narrowband O2 sensors, fuel trims and their relation.
This video should be mandatory in auto schools. Well done, Dan!
logical canuck Thanks!👍🤪
ALL Dan's videos should be in auto schools. You are the best Dan!
Fully agreed
I had to diagnose a stalling problem on a 95 Stratus 3.5. Long story short fuel trim max high bank 1 and then max lean on bank 2. When reset it would run for a few minutes until the trims would do it again but sometimes swap sides. Long story short the engine had been swapped with 1 year newer and bank 1 & 2 were reversed in the harness on that year model. Computer would see bank 1 go lean and enrich bank 2, bank 2 seen rich and lean bank 1 some more. That was a fun one.
They are in my classes. Willcox, AZ High School
Hey Dan I know this video is a couple of years old but it just saved me over $2000 dollars. 2006 Acura TL 216,000 miles P0420 catalyst below threshold bank 1. But short term and long term fuel trimmed maxed out. Downstream sensors were reading lean condition.Sprayed carb cleaner to verify downstream o2 sensors were working. They were. Long story short coolant temp sensor was +40° off. Making the ECU think the car was hotter than it was and giving less fuel. Which the o2 sensors were reading and ecu trying to compensate with fuel trim. No 02 sensor replacement ($200 × 4) no catalytic converter replacement ($600 ×2). I do my own work (free). $30 coolant temp sensor fixed everything. Cant thank you enough. If you're ever in NYC I owe you a ton of beers.
I cannot think of another skilled trade where we are required to have such vast knowledge yet earn such poor pay.
Within time constraints and owning/needing costly tooling/equipment as well.
Not to mention the safety risk and health effects. My shop refused to provide us with safety glasses, mask, ear plugs or knee pads. They provide a cheap safety shoe once a year so if you worn it out, they wont replace it for you. The gloves they gave are cheap cloth ones, not oil resistant nitrile. Used engine oil causes cancer
Poor pay? My tuner charger me 1100 for 4 hours of dyno tuning. Y'all charge 80 to 120 per hour for labor. How's that poor pay? I was a mechanic for the army for 14 years. It's not hard labor. And tuning requires knowledge. But that's it.
@@09fatbobmike We probably get $11 - $25 per hour from that 80 - 100
@@bengkelbawahpokok6753 WELL thats some shitty shit there. time to start your own business. 25 is good but anything under 16 is under paid.
this dude is smart he knows how to explain things simple to understand!
My wife thinks I'm dumb🤣🤣
@@Diagnosedan Great thanks to your wife, otherwise we never know if you would try to prove yourself opposite by explaining us thinks in such an excellent way. So, when she says so, let's think this is the way how she develops your talent.
Are you familiar with nissan tiida latio
@@Diagnosedan all wifes are the same. Women, they hate each other, and they're partners/husbands (after a while..) because we share and admit the clever among us, while them/they're, nothing like that.. brotherhood of man. And I swear I am not misogin..
@@Diagnosedan 😂 I know how that goes!
Now in my sixties and having left the auto technician career behind (25 years ago) for tool and die, I'm thinking of a return. Of course it'll be my own shop. Who would hire an old guy? With your ability to explain various systems you've brought back my mojo. I totally understand you. Thank you for these videos. You are an inspiration.
You are teaching the whole Earth Mr. Your teachings are better than those at the University
Awesome video, So many great uses for brake cleaner lol... another way to verify O2 and A/F ratio sensor operation from the driver seat (on vehicles with vacum power brakes) is to pump the brake pedal rapidly for a few seconds, this will force the system lean and when you stop pumping the brake pedal the system will go rich for a little bit. All you have to do is monitor the sensors and see which one is not responding 😊
👍👍😉
Great tip!
And... another way to verify brake-clean💯
Except on our skin
Watching this video 4 years after it came out and im amazed. Dan, thank you for setting this up and explaining all of this simple and very easy to understand!!
Diagnose Dan, you are the MAN!!! I ran across one of your videos the other day and I am such a fan now. You are exactly what the new generation needs as a common sense back to basics teacher. You are mandatory must watch for my younger crew. Keep doing what you do and we will keep subscribing, watching and spreading the word!!!
Dan - you killed it ! So clear and concise. Grateful you took the time to post this. Really helped explain the P0172 I had on my Subaru Forester.
Keep making these videos keep chiseling our brains as technicians! So far you have not lost me because of the thorough explanations!
I am watching this video over and over again. Amazingly that other shop replaced a common part that would affect both banks (the MAF sensor) when the vehicle only had an issue with bank 1. Too many parts replacers out there in the industry without "diagnostic" skills. I see it as "keep on throwing parts at the vehicle till the problem goes away"...sorry, but not on my wallet. I love these videos!
Thanks for the great comment!
That BMW uses a Valvtronic system. Basically it can control valve lift electronically which pretty much eliminates the need for a throttle plate and this is the reason there is no vacuum at the manifold because air flow is controlled by controlling valve lift instead of a throttle plate. This system is very similar to what Nissan Calls VVEL (vairable Valve Electronic Lift). It's pretty slick.
Exactly!👍💪
Мu BMW is a valvetronic is a nightmare for repair
@@traqnsavov822 it's not to bad
my is valvetronic TYPE 1 is not very good, you is TYPE2 is good :)
Traqn was my first weekend at the lake at the beach and my friends at the park at my moms t you can not get gym and the people Savov
This is the best explanation of the o2 sensors I have seen. Dan you are a great teacher, keep up the fine work.
You are the real thing. I'm new watching your videos and Im really happy I found your KZhead channel. Thank you for sharing your knowledge.
Excellent coverage - thank you very much - and I especially like how you determined to add some fuel ( brake cleaner) and see if and how the narrow band sensor downstream responded in order to validate the upstream unit.
If I had seen your video a while back, you would have saved me many hours of debugging time and research on this topic. Hats off to you sir.
I have a 2001 330i coming in Friday. While I was servicing the A/C system he was telling me about the problems he has been having with the vehicle. I scanned it and found numerous codes related to the O2 sensors on banks one and two as well as a Number one misfire. I also found a DME fault code. He told me numerous shops have replaced the O2 sensors MAF Sensor and it had a tune-up. He is bringing the vehicle back Friday for a more though diagnostic. I will have a plan of action in place to better diagnose his vehicle's issues. Thank you for a very informative video on the Wideband O2 sensors and fuel trims.
A another easy to understand lesson. Thank you for all your sacrifices you made in order to offer these videos to us! I Can't stop watching your videos, they're so contagious! :-)
Thanks for the great comment 👍👍👍
I agree with Ferenc-thanks again "Dan the. man"!!
Brilliant Dr, Dan. Actually, you are answering what would the audience ask u. Thanks again
Hey Dan Thanks for posting these videos your are a great teacher. I have been watching your videos for a little while now and I have learnt alot. I have been applying your technical advice in the field and using scopes more often than I use too. I try keep it simple and not be a part changer thanks to you and several out their I am becoming better and enjoying diagnosis more. I will try to to pass the torch. Of knowledge to our fellow technicians out there as you are. Thanks again. For the answer to question for no vacuum on bmw its due to the valve tronics it act like the throttle and the actual throttle stays open all the time which does not allow negative pressure (vacuum). Bmw actually installed a vacuum pump driven by engine camshaft. I think when system goes on fail safe throttle may operate like a normal throttle open and closing not sure correct me if I am wrong. Anyway keep up these great videos and I will keep watching. Your awesome
Awesome! I always wonder what was that short and long term fuel trim on scanners and never found neither the classes I took told the answer. Thank you for this video, strictly to the point and calm talking, very well teached!
What a great lesson Dan. My understanding of O2 sensors was basic till I watched your presentation. This topic is deep. I was glad you presented it in a slowed manner. I was actually haveing mental gymnastics calculating what you were presenting. Never knew widebands were current sensors. Just replaced the downstream sensors in my 180000 mile N62TU. Car runs so much smoother. I think the downstream sensors play a role in fuel trim, not just cat effieciency monitors which was the code I got on bank 1 and 2. I have no clue on the algrithms BMW uses in the DME.
Dude, you are awesome! helped me with Wide band O2 sensors. Clearer than anything else so far.
Christopher Rumfield thanks for the nice comment buddy it's appreciated!
You are a great teacher Dan!👍🏼 thank you! If I’m not mistaken that BMW also have an absolute pressure sensor in the intake manifold, which will not sense an intake air leak.
You have been my great teacher,since i started following u up i have improved i lot in my career as auto electricians. I want to say a big thanks to u.
That's a big honor, Thank you!
HI DAN; TOTALLY IMPRESSIVE DIAGNOSTICS. RIGHT TO THE POINT. YOU ARE A GREAT ASSESTS TO THE AUTOMOTIVE FIELD. THANK YOU
We have a lifelong respect for a teacher like you. God bless you.
Thank you👍
Me to grate respect
You see i am not having any such problem on my car, i am not even a mechanic, however i really enjoy your shows. They are informative and nicely presented. You are way better than lots of teachers and some tv shows.
Great job explaining this in simple terms! Best teacher so far! Im very gratefull for your very helpfull videos!
Very informative... After replacing my injectors, I started noticing backfiring.. I never thought a lean condition could cause that.... Your video has inspired me to send the injectors off to be tested and after I replace them, I'll check my O2 sensors. Thank you
What a wonderful tool to have in our database. Thank u Diagnose Dan!!
I like watching people like Dan, intelligent ,funny love what he does. I like to help and teach people too, feels so good,, the more we learn the better we get. this world will be better
13:36 Because the engine has a valvatronic system, which replaces the operation of the throttle valve, and instead of it, the valves open at a certain height, and not the throttle valve. And the typical pressure in the intake manifold is close to 950 millibars normal atmospheric pressure is 1013 millibars. Typical vacuum in most naturally aspirated engines is 300...350 millibars.
Thanks to your videos I learned to look at my data and it helped me to diagnose an 05 Infiniti with a long crank time and lean readings on both o2 sensors. No lean codes were stored and car ran perfect when it started.
Gregory Jones Nice!💪
You are the better of the diagnostics, God bless you dude!!!
Thanks! 😊
Dan I’m impressed,best easiest to understand description of narrow and wide band sensors I’ve seen so far....Many Thanks 👍🏻
Your welcome Steve👍
Watch your videos a lot. You are the best! As a long time shop owner I often use your instruction to help my techs to never forget the basics! Your breakdowns are awesome! Thanks for all you do for our industry!!!
Thank you very much Jimmy👍👍
This video is so good that I watch it over and over again.
Learn so much from you in the span of 6 mins and learn that my upstream 02s is needing replacing thank you!
THANK YOU DAN FOR YOUR TIME .... YOU ARE AWSOME TEACHER
Piotr K Thanks for the nice comment buddy it's appreciated!😉
Every time I have a fieling issue with my bmw i come back to this video, which helps me interpret data from my car. Many thanks for this video
You are the King of diagnoses 🙌, I learn so much from you😎
Great info, the illustrations really help to understand what is happening
Pico Boo, Thanx😀!
Great detailed explanation Dan! Thanks for taking the time to film this! 👍
Former dealer driveability technician here. Impressive explanation of narrow vs wideband and relationship with fuel trim. You have a new subscriber.
Your videos explain everything very clearly. No one does it better.
Michaelangelo Ferrari Thanks!😁
That's a James Bond song. Nobody Does It Better. Dan's new name is Bond, James Bond.
Outstanding Dan! even mechanics can learn from this, Extremely well done.
Thanks Bill.
I have a Commodore with a Buick derived engine. { Australia) I will stick with its simplicity compared to these Euro engines with multiple O2 sensors and variable valve timing. So far 280,000 kilometres and still on original injectors and sensors. I can do a lot of the work myself unlike these complex cars which need some expensive equipment to diagnose. Still very fascinating learning how all this new fangled stuff works. Really appreciate your time and dedication producing this training grade series.
Dan you are the man I love watching your videos and I wasn't 100% sure on 02 sensors narrow and wide band you have just explained that and it all make sense now and fallen into place thank you
Excellent case study my friend. Thank you for your time to bring these video to us. Cheeers
Thanks! and thank you for doing the same👍
Honestly great work Dan. Informative and concise.
The best video demo on O2 sensors.
You are an excellent teacher. So clear.
Great video! You put it all together in a very understandable way. Thank you.
Awesome video thank you Dan the man . System bmw came out with I believe it’s called vanos which requires no throttle plate so that engine rpm is changed through variable valve lift
I watch your video as a good series. Not every educational institution explains so well. As they say there are no bad students, there is a bad teacher.
thank you for the video I've had a hard time finding good explanations of wideband, narrowband, and the relation between the two with new systems that use both oxygen sensors for fuel trims. Next is Biased Voltage sensors.
Awesome video as always Dan , was at work today working on vehicle with wide band sensor , it’s never too late to Learn more 👍
Well put Dan, very easy to follow your explanations. Thanks Dan
Thanks for making it easier to remember Dan. I always like your videos you are a top notch trainer.
Thanks!😊👍
Superb explanation of fuel trims! Very helpful for me!
Fuel trim was always a problem for me to understand before i watch this video. Thankyou v much
Very informative and well done video! Thank you, Dan!
Perfect from start to finish. Thanks Dan!
Very good video Dan! Always a pleasure watching them.
Alin Marinescu Thank you!😉
Just discovered your awesome channel. I guess the answer to your question is the fact that there is no throttle valve on this particular model. That role is taken by the Valvetronic system.
Thanks for the great videos,sharing them with the younger techs on my team to sharpen their skills
That's great! Thanks for sharing!
Thank you, Dan, cleared up a misconception in my head about wide band, now I’ve got conception :p
Thanks Dan! Clear explanation makes it easy to learn!
Great video, Dan. I'm a long-time self-taught garage mechanic working mostly on German cars, especially on BMW's. And I'm also learning even more by just watching this video. To answer your bonus question, I think there is still a slight vacuum after you remove the MAP sensor, or else, this Naturally Aspired combustion simply won't work. And the reason that even when you articulate an artificial leak in the intake manifold and still maintained a stoich condition is because of BMW's VALVETRONIC system in place. Under the VALVETRONIC system, the throttle body no longer plays a key role in intake air control. In fact, you can have the throttle body fully open the whole time and it won't make a difference as long as the O2 sensors are properly working and nothing being wrong with the fuel supply. Actual fine control of the air is done by the intake cams which is fully modulated by the VALVETRONIC system.
Hey Pete spot on man! Also, our after cat 02 sensors do influence mixture on BMW’s by providing a reference point.
Correct Sir
This helped me understand why my Narrowband replacement o2 sensors weren't working... my car was designed for Wideband sensors! Thanks!
Best short/long term fuel trims explanation video. It had to be a Dutch guy. Mooie!
Thank you Dan , your videos are very helpful and very informative. I appreciate your wisdom..
You have that ability to explain complicated things in an easy way...great job danny, btw i've scrolled down almost all the comments and haven't found the ansewer...
Good information about the O2 sensors, thank you for sharing your knowledge.
Your welcome!
Well done! Even a non-carmechanic like me totaly understood your story. Thnx
Important information is simple words, great video. Thanks for uploading
I had to watch it a couple of times but finally got it. Excellent video . Thank you for making it.
Very clear explanation and great video! Where does one learn this level of knowledge. You inspire me to want to learn.
Thank You so much for your explanation! You explain so well! Love from Brazil!!!
I’m late to the party as I just discovered your channel. Excellent instruction and trouble shooting. Keep it up. Looking forward to more videos.
Best explanation so far, mate. Great stuff as always 👌🏼
dear Dan, you are a maestro. thanks bro.
Just keep watching over and over till u get it . That’s what I did and now I understand thanks dan 👍🏻
Thankyou. Your explanation is very clear compare to my instructor
Very good video. Short, clear and made simple
Just discovered you and glad I did you're a great teacher!!!
Great to have you here!
The best and easy to understand explanation
Great content in this video! I am surprised that BMW does not have a back up fuel strategy for circumstances like this, a lot of the Asian vehicles use downstream fuel trims when they have a upstream wideband
Eddie, Thank's for your feedback!😎
It is very simple and easy to understand.Thank you!
Wonderful explanation, Thank you Dan.
I have been driving myself insane troubleshooting a failed smog on my 98 boxster. Fuel trim negative, indicating rich. But downstream shows 0.1 or 0.05, lean. This video explained clearly that it's likely an upstream. Untill now I have been watching voltage instead. Thanks for the help.
Best video. About fuel trim and o2 sensor we need more video please good luck from sri lanka thanks
Well I didn't know what Valvetronic is since I do not own a BMW car (my last one was a 1995 E36) and my BMW motorcycles do not use that system either. My guess was a MAP sensor only needs a tiny hole to measure pressure (since it is static and not dynamic) and that tiny hole would not allow enough air to enter the engine. But this video is excellent to understand about Fuel Trim (I had no clue about trim)! My friends Porsche 993 is running ultra rich after having the engine out for seals, o-rings and a new dual mass flywheel and clutch. Plus we did the 964 mod to the 993 cams to pin the timing gears to the camshaft (the original 993 gear is a butt fit to the camshaft using a bolt...in my books a no-no). Anyway, I think we will have to do an ECU Drive Cycle / Readiness. Thumbs Up Dan!
Thanks for the great comment buddy it's appreciated
Awesome videos Dan. I have really learned a lot and they keep me wanting to watch more just for fun. Thanks.
AWESOME video, once again, DAN, Thanks for all that you do, Bless 😇
I'm glad I came across your channel. Probably cause the variable valve lift is your answer
Richard Gill, did you watch all my video's at once🤣🤣🤣🤣. Thanks buddy glad you like my channel. And Welcome!😁
thanks for awesome video . i have 2016 hyundai 1.6l GDI . upstream reads 1.40v steady . respond's to vacuum leak and rich to add brake cleaner . downstream steady at 0.600 mv ... no symptoms no codes . complaint is excessive fuel consumption ... upstream o2 is 5wires . thanks for your help
Good analysis Dan. Great Job and Cheers