All you need to know about Toyota Oxygen sensors and AF sensors

A Toyota master diagnostic technician shares all you need to know about Toyota Oxygen sensors and Air Fuel ratio sensors.
In this new series on my channel I will take a monumental task of explaining the overly complicated engine computer control for OBD2 emission standard work. I will follow my channel's theme of simple but complicated to make this information easy to follow and understand for Toyota owners interested.
In part 4 of this series we will cover an important subject. Oxygen sensors and Air fuel ratio sensors. How each of them work and what are the differenes between them.
I will also cover how they are installed in the car which will take us to the conversation of Engine banks, which one is bank 1 and which is bank 2.
Towards the end of this video I will explain how these sensors have a significant impact on how the engine computer is using the input from these sensors to control the injection volume.
Lastly I will share some DIY tips from the real world. These are tips and tricks that you will not find in a book and you'll only find from years of experience working on these cars every day.
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#thecarcarenut #toyota #howthingswork
0:00 Intro
0:31 Oxygen Sensors
3:49 Air Fuel Ratio Sensors
7:01 Sensor locations
11:53 The most important thing!
21:30 DIY Tips

[@DLMorel]

Retired dealer tech here, I hope people appreciate how hard you are working to explain this. I sent a link to my sons, this is very well done.

[@TheCarCareNut]

Thank you my brother!

[@EZ-D-FIANT]

I've just started watching but am looking forward to it from your comment alone....

[@fritzpierre9631]

Good stuffs 👍

[@rakanrakan9994]

@@TheCarCareNut is it need to replace it with new one for good reading of fuel and air ratio ?even if old one is good ?

[@jeffgrantIS350]

Can you please help me. How would you disconnect the plug behind the block on Bank 2 sensor 1. The plug for 02 sensor is tucked behind the block and I can't get both hands back there to push the clip and pull the wires to disconnect the connection

[@GearheadSchool]

Good job AMD. I taught automotive in the community college system for 15 years and your explanation hit the mark. A good educator makes complicated things easier to understand, not harder to understand.

[@sunnybrian9125]

Car-care nut,I am an auto-mechanic, specifically,a Toyota specialist.I operate an auto-workshop here in Lagos Nigeria.Since I came in contact with you on KZbin,I have tremendous respect for your detailed, not only to your DIY viewers,but also to practicing mechanics. I must confess,that you are a born teacher. I am your great fan & I will never stop watching your videos. God bless you forever.

[@user-mc5eq5nc9l]

Hello sir, Pls where is your shop located in Lagos?

[@Hugh_Manitee]

"The warm glow of the check engine light ". CLASSIC. 😂❤ 20:10

[@outfield1988]

You do a amazing job on the videos. I was a mechanic for years and I still learn from your videos. Thank you.

[@Wordywizard1121]

This guy is the best. Absolute master mechanic generously sharing his technical knowledge, what a legend. I've spent so long trying to figure out an issue I've had and now i know it's a vacuum leak. Thank you from the bottom of my heart.

[@tomryan9616]

Thanks again for your excellent videos. Your not just a master mechanic but also an excellent instructor. I’m a retired vocational instructor with 26 years in the classroom and before that 18 years as a union tradesman. It shows how much you love your trade and that makes the best instructors. Thanks again for sharing your skills. God bless you.

[@dporrasxtremeLS3]

YES! Agreed!

[@shaneanderson1036]

wow . i’m 58 years old . consider myself “ knowledgeable “ in most things mechanical . today i learned something new . thankyou sir

[@flagmichael]

Same here. Our knowledge always has gaps, and this channel fills quite a few of them.

[@shaneanderson1036]

@@flagmichael iv always done a reset on my cars computers after a service / filter change. disconnect the battery neg . turn head lights switch on , insert car key ignition and turn on. then remove key and let sit for min 15 mins to drain the slightest bit of storred electricity in the computer . then connect battery and turn key on and let sit for 2 mins before starting . let idle up 10 mins till temp gauge starts to move then drive normally . i find this resets the management systems and maintains a healthy fuel ratio level . am i wrong ? i just reset out little 2019 1.6 korean car as it was getting heavy on fuel . this reset worked a treat and dropped the fuel consumption a lot . from 10-12 ltr /100 to 7-8 ltr /100 .

[@HumbleThyself230]

Owned a 2011 Prius and now a 2001 Camry with 113000 miles on it and your videos have been extremely valuable. Thank you for taking the time to make all of these quality videos! May the Lord bless you and keep you as well!

[@whiznot3028]

My 2001 Camry has 117,000 miles. I still love that car.

[@ericking3043]

I have to say, even as a professional oxgen sensor supplier, i am still impressive to your video, you know more about the sensor than me, Nice job !

[@docvince100]

i have a doctorate degree and surprised to find that practical things like these are the things you really need in everyday life!

[@AA-os1sg]

Hey doc how you doing

[@22kpar1xcyberdyne9]

Old time mechanic here, I learned alot today. Thanks!!!

[@DanielH1818]

Excellent teacher, we need more educators like you! 5 STARS "Better than a thousand days of diligent study is one day with a great teacher." Thank You!

[@irfandurrani4089]

You are an excellent teacher!😃. I am learning so much. I don’t want to miss a session.Thank you for giving us your knowledge!

[@makeorbreak4life]

I concur. I don't know why I had not come across his channel sooner. Keep up the good work.

[@je19662008]

This is definitely my favorite automotive youtube channel. You know your stuff and you know how to explain it in simple, layman's terms. Excellent job all the way around.

[@ralively8943]

In just three years, the McDonald's dollar menu has undergone a five-fold transformation - it's now the five dollar menu! The video seems to have been captured around the time you left the dealership, with the Big Blue visible in the background. And now, you've established your own shop-impressive progress!

[@stevenwallace122]

I have always been curious how auto parts work, not just how to install them but to know the physiology about them. I am so happy I came across your page. I will be a lifelong follower of your channel and I appreciate you breaking down logic for people like myself who are not born mechanically inclined.

[@kimdavis5631]

Your video makes my day brother. Thank you for being what you are.

[@12bluex]

AMD, you have a talent of explaining complex topic in a easy, organized way using plain English. I been DiY shadetree mechanic for a while and you're the first person who can explain the emission system and how it works that actually makes sense. Thank you posting such a useful info.

[@moffatk7948]

Another awesome video. O2 sensors well explained. I loved the analogy of the O2 sensor being the angry mean unhappy guy doing the QC. The brake fluid trick to remove stuck O2 sensor is priceless.👌

[@phyde1885]

Yes ! Little 'TRICKS" like the Brake Fluid are a Hard lesson that save you SO much Time and Angry energy wasted that come from an Experienced Mechanic ! I'm a Retired EE,and spent 7 years in the Army as an Generator Repairman 52 Delta. But OBD2 didn't exist then,and his method of teaching is VERY WELL Done !

[@davidwilson9284]

I learn something new from every video you do. Appreciate your time and effort.

[@ottostasi197]

These videos are really great , I don't know how many I've watched already , I learn something new every time . Since I was about 13 years old I wanted to be an auto mechanic . I went to General Motors Training Center right out of high school in 1969 , I was not sponsored so I didn't have a job afterward . Ended up working in a steel mill and am now retired , I have a shop in my barn and spend my time buying and selling machines ,do some fabricating and do maintenace on my cars . I have a 1994 Toyota T-100 pick up truck that I bought new , its got 335,000 on it still runs great . I just bought a 2012 Lexus es 350 and I appreciate you and your excellent knowledge of your trade , I wish I could start over and work with a guy like you .

[@ChrisWilliams-pu8pj]

I love your presentations. I don't know of anyone else that play acts an AF sensor. Definitely make it memorable. Thank you!

[@tonykhatthy4008]

Really appreciate your time putting into making this video. Your explanation is easy to understand without going too deep to theory.

[@Semiam1]

I learned so much about O2 and A/F sensors from this video. Thanks!

[@aseaboch]

Your videos are a must for Toyota owners!

[@mikeoneill7360]

Love this guy, one of the best tutorials I have seen yet.

[@NorthPaddle]

Thanks. You cleared up my O2 sensor questions. I didn't realize the front and rear were different.

[@willowsadventure6611]

Amazing! It's wonderful to know there are still such great educators out there. Thanks!

[@Starman-yt8lj]

Excellent job AMD! You have a gift for teaching.

[@tinkerscorner54]

I love your explanation of the O2/AFR operation as a "tango". That's the most understandable and least "Dry" presentation that I've seen for it. Thanks!

[@MariaRodriguez-bp1tl]

You are an absolute gem to the Toyota community💚

[@duanegar3975]

I've watched a lot of your videos and I love how you are actually teaching people how to actually fix and do mechanical work on vehicles thank you and I look forward to seeing some more of your videos

[@paulc2548]

Another great video as always... enjoy every minute of it and learn a bunch. Thank you!

[@Cleofizoid]

I haven't watched a bunch of your videos of this "Toyota Engine Controls" Playlist, but this one is well done 👏 I now have a basic knowledge of the O2 & AF sensors, "Bank" IDs and open/closed loop. I'm now going to go back and watch previous videos. Hehehe now I'll be a to follow and understand better Eric O's videos 😀

[@p6102zrfxe]

Thank you AMD for another wonderful video. Looking for next one.

[@fishingguy8911]

Yep, another informative video from a knowledgeable source. Thanks for sharing your knowledge with the world!

[@C_Rent17]

Could have fooled me on there being a difference between O2 and A/F ratio sensors. I’m truly grateful for your insight and can’t wait to learn more!

[@johnnyfmorgan]

great tip on using brake fluid on the threads to free up a seized o2 sensor. worked like a charm!

[@sherifmahmoud6523]

That's a perfect explanation, and the analogy is really spot on, very easy to understand, thank you so much

[@johnscreekmark]

Excellent description. Sometimes nomenclatures get very confusing. You explained it very well! Thank You! 👍

[@dgdiyer1191]

Great explanations about the O2 sensors and possible troubleshooting that would cause them to throw a code.

[@sambitar8448]

DEAR SIR; PERFECT EXPLAINATIONS, DIRECT TO THE SUBJECT AND SIMPLYFIED. THANKS

[@Dbailey981]

You are a very good teacher!!! You do such a great job.

[@nono7533]

Wow. What a great video. I learned so much from this. Having battled a "lean bank one" issue, this really cleared up how the sensors play into that code.

[@richardl.rayiiitr3media__367]

This is the best explanation you will find on KZbin. He explains everything you need to understand and more.

[@docker588]

I watched this video with basic knowledge about engines and I understand as very best explanation. Thanks !!

[@rusty358]

The brake fluid tip worked when I couldn't budge the sensor! Thanks!

[@AndyLambg]

Thank you very much for such a good explanation on a complicated subject. Good play act too. Awesome! 😊

[@richardthomas9401]

got to love this guy....knowledge is POWER..love to learn new stuff..Thanx Bro

[@samiam9059]

Don't own a toyota but your excellent channel is a great service.

[@joelgrandbois9327]

I must say I'm never disappointed with your info. Easy-to-follow. I'm sure you're making good money doing this but you are helping people that completely hate taking there stuff to the dealer. Thanks for all the help

[@Cwayne1989]

Dude you're amazing!!!! as someone that owns a 2006 Scion TC, Thank you for these, greatly

[@javierpinzon9721]

Hi AMD! I own a '03 Camry and are a DIY guy. I have been watching some of your videos and they are excellent. Your way to explain things is very easy to follow and understand. Thank you and keep your great job. Many blessings!

[@maldonadolemus]

This video is the best I ever seen in my life. Explained so simple.

[@sandukanec]

This is so well explained! Thank you Ahmed!

[@VILSONDUSEVIC]

Thank you AMD. Your tips are incredible. Please post videos more often.

[@ahmadghosheh3104]

Excellent explanation. Many parts stores online or local play fast and loose with the terms O2 sensors and A/F sensors. I really couldn't make sense of it. This is perfect video

[@nancyneal4982]

Thanks for all the great information explained in easily understood language. Really appreciate it.

[@jessedrown4301]

Thank you! This was extremely comprehensive and very helpful.

[@two4mediapng]

I love the in depth explanation of this and how you personify the sensors & the ECM on how they communicate with each other. It gives us a clear picture on the operation of the engine. Thank you so much!

[@khaledelsayed7009]

Thank you so much for yet another great lesson. Did a lot of work on my cars after watching your videos.

[@Barton_Motors_Ltd]

Awesome. Gotta pickup a 22mm wrench now and some thread chaser. Loved the brake fluid tip

[@simonwinwood]

i love this channel. I can’t be the only person without a Toyota here

[@ortiz73caify]

Excellent video and as always thank you so much and God bless you.

[@Ari-fq2qm]

One of the best channels in KZbin if not the best!

[@Andreyatl]

Great vid and down to the Earth explanation ! Thanks! Cheers from Russia!

[@gianave]

the Car Care Nut is simply great in making complicated concepts easy! in the end all this makes me enjoy even more driving my Toyota. I'll keep on following you. thank you. Greetings from Italy

[@Stupid_Blondy]

I totally put on the wrong upstream sensor a year ago. Between this video and the one from Denso, everything makes sense now. Thank you, friend!

[@MarzNet256]

Excellent, as usual. I'm doing a diy course in automotive mechanics. You are one of my professors.

[@tomthumb3085]

This is the best explanation of the workings of the fuel trims that I’ve ever heard. It’s put in such a way that it completely takes the mystery out of these much overlooked components. Excellent video, thanks for sharing you knowledge and skill. I’m now subscribed.

[@Troy_Built]

You do a very good job explaining this.

[@RickTroutner]

I learned about these when diagnosing a P1133 code on an d ES300. I could see one sensor fluctuating around 0.660 volts from 0.645 to 0.685 and the other staying right at 0.660 volts. It took me 3 orders to get the right sensor, one from the dealership which turned out to be the oxygen sensor, one from Walmart which looked like a suspect counterfeit, and finally the correct one from advanced auto.

[@bkanegson]

Great intel, thanks for the brake fluid tip!

[@DIY-AutoMech]

Thanks for the tip about using brake fluid on O2 sensor threads when it's stuck. And the difference between A/F & O2 sensors.

[@g2skinny]

Been a mechanic for 30 yrs totally get it brother

[@Pennconst101]

Brilliantly explained. I feel I have a much better understanding of what is going on with my car. THANK YOU!

[@MarkSmith-js2pu]

I enjoyed that very much. A couple of life mysteries solved!

[@robv60]

Excellent, thank you! There's nothing better than listening to someone, that knows their shit so well that they are able to explain a somewhat complicated concept in terms that are so easy to understand that its actually enjoyable to listen to then talk about damn O2 sensors in a car!

[@sorin.n]

Excellent lesson on the topic! Thank you!

[@littlepoolefam3]

Thanks, dude. This cleared up so much for me. I got a P1133 on my 1999 Toyota Camry LE, and this video explained a lot. By the way, I will end this with the same thing you said, as I always use the same when I write. God bless and keep you and your whole household, brother!

[@raymondsmith6943]

Thank you for all the great Toyota info. Very helpful.

[@gregsantos9731]

Wow! Another brilliant sharing you gave me. Thanks! ❤

[@AlexBAlixir98]

Ahmed. Thanks for explaining oxygen and AF sensors. I watched this one twice. We take so much for granted as we start up and drive our vehicles. So much is happening behind the scenes to keep our cars going. Modern marvel for sure. I like getting these insights on how my vehicle works and what I can do to keep it running well. I had a 2005 Camry LE w CA emissions that had the 3 oxygen sensors you mention. One of the three you could see upfront when you lift the hood. Thanks as always and look forward to the next video.

[@TheCarCareNut]

Thank you Alex! Those Camry models with the 3 sensors are kinda rare in Illinois but every once in a while we get one and it always attracts attention in the shop

[@16jduran]

I’m glad I saw this video. My ‘01 4Runner got a code for a AF sensor and now I understand a lil more how everything works. Hopefully this fixes the recent sputter it has. Only happens when I’m waiting on a stop light 🤷‍♂️ I like investigating stuff like this on my runner

[@C-M-E]

Oh man, thank you! Been trying to pin down a sporadic misfire that is highly weather/temperature sensitive; only happens when it's cooler outside on an '07 5.7 Tundra. After doing the usual tune up remedies and it still happens, I'm going through the OBD readings and had no reference to what is 'normal' for this engine. Great info when it was needed!!

[@adamwoodworth5758]

Thank you, I now have an understanding of these sensors. Very professionally done, and relatable for a novice. My 2001 highlander has a code for one of these. Once I use scanner again...I will know which one to replace. Since there are four...you saved me time and money.

[@banjotramp1]

I learned basic engine operation back in the 70's, was perfectly happy pulling the odd engine and could do most repairs back then. I think PVC valves were about as advanced as it went then. Now I'm driving a Rav4 Prime. It's sure not an early 70's Chevy Nova (means "Does not go" in Spanish. Or English either) ! I missed the past 40+ years of car tech. It's been fun now catching up. And your explanations are excellent!

[@robertwilkinson8421]

Great Vid. This Man is a Master Technician/ College Professor, seriously. I might not use this Information, but I'm enjoying just listening and learning about Toyota systems, which might help me down the road in the future.

[@pedrocruz6407]

El mejor maestro automotriz que explica detalle por detalle , gracias apenas me acabo de suscribir Gracias

[@amaliaasturias446]

Excellent information. Thank you for teaching! God bless you and keep you too!

[@william7108]

Got to love your metaphors there to explain these for sure that's a good thing

[@salmothymus]

boy, what a treasure of info and advice ....also the "visualization", the "ECU Tango dance between MAF and AF" 🥰

[@thechodfather]

Master teacher as well…thank you for pinpointing the difference between o2 and a/f sensors..

[@innyakpabio]

Amazing stuff here. I learnt a great deal as much as I enjoyed your presentation. Endless 👍🏼!

[@coloradoboo1071]

lol....."Loose nut behind the wheel gets the warm glow of a check engine light" cracked me up! I have two Prius hybrids and notice the ICE engine sometimes comes on even though the traction batteries aren't low....so must be trying to get itself to go to the happy state of a closed loop. Very interesting video and helps me understand some of the sensors I'm seeing when under the hood and under the car!!

[@danparker5021]

Old School Tricks And Tips Very Helpful !

[@03FXSTBI]

I can't thank you enough for this. I have a 2003 and 2004 RAV4 (his n hers) and I just learned a lot. Especially about staying OEM on the A/F. Cheers!

[@algertcorbaxhi2698]

Exellent the brake fluid really works. Like you said a retired old Toyota mechanic told me the same thing but after i made the damage😃😃

[@playfunsun]

I do enjoy experiencing your videos your a relatable soul to me