Easily the best video on o2s and trim I've seen. No BS Straight up knowledge. Excellent video. Thank you

Thank you for teaching me how to read my sensors, you are a life saver. Awesome video.

Awesome video! I’ve had a scanner for a while but never understood what exactly to look for as far as live data in diagnosing my problem. Thank you for your time!

Very educational.. I'm a diy person and bought a Zurich z8.. now I understand these readings better.

Incredibly informative material here, brother! First-class all the way! I have been watching videos and clips trying to learn how to read live data for 20+ years still not quite understanding it all. In 14 min you just topped all of the others! Wow! Thank you sir. Outstanding!

Learning to read my scanner and was wondering what some of the terms and readings were all about, and wow, I found your very informative comments

Awesome, was looking at the live data the other day for a p0141 on a rav4, and you are correct not a lot of good content exists, so thank you and keep'em coming:)

This is an incredible video !!! Amazing explanation on live data

Hi thanks for sharing this information because I just bought A scanner obd2 reader for DIY for my ford escape 2004 I was viewing few on utube I just randomly clicked on your videos on how to read what is On the live data on fuel trims & short/ long term work Stogether with o2sensors l have learnt what is happening to my engine efficiency with your calm voice instructions I analyze with better clarity how to diagnose if having problems like vacuum leak all types etc or with fuel related issues so you emphasize things it’s simple but so important to learn I appreciate your help to me & other people search for answers by your videos bring it together for me any way thank you 👍😊 so I subscribe & like as well. Great job 🤙🏽

WoW hat's off sir what a great and deep and easy lecture with live data streaming salute sir

One hell of an informative video.

Love this video and thank you I found my knock sensor that was in my truck but I like the cold air because it makes my car sound good but you are right it doesn't gain any horsepower this is a great video thank you

Great video bro, good way to explain everything in easy terms to understand

i'm starting to understand this whole thing.Thanks man

Good video bro. I've been twisting wrenches for yrs,but I needed to understand my live data.👍

I had a p0160 b2s2 . I put my scanner on the live data and it was like a constant value. Then I rev the engine a little and then I saw it change some. I ended up jus clearing code since I saw the reading change some after rev the engine some. I had the car idleing some for awhile so as I was working on something dealing with the power steering fluid flush(suck fluid and add 3 times) I’ll keep my eye on this one p0160. B2s2. Great vid on this subject matter

It’s very good explanation video, Make me more understanding about the STFT and LTFT Thank you

Very useful brother. I'm working in NISSAN dealer in Dubai. It's much helpful for me.

Love the explanation. My Camry stft 0.0. And ltft 38.9. I change maf and 02 sensors also done smoke test

Your doing a good job keeping us informed thank you

Thanks man for clarifying these readings, so useful!!

Perfect, the way you explain 👌👌👌👌👌 All the way from south africa

Thank you for ur video I’m new on this subject and new on using a scan tool I appreciate your information and how u cover the information thanks

Bro..... great video. Please keep em coming. Best descriptive video ive seen in a long time

You do well on explaining as well diagnosis Knowledge is great for self taught good job

And that’s why the screen has all that info; makes it easy to understand.

Real good explanation of FT.

Now I finally got a little understanding about this. Thank you..

Very well explained great video help me out thank you

The point you made about the cold air is true. If you change the air fuel ratio outside of factory you'll need a tune.

Excellent video. Thank you.

Thanks a bunch! VERY Helpful!

04 Jeep Liberty 3.7L, 115k got a P0157 bank 2 sensor 2 low voltage a couple weeks ago. Cleared code and hasn’t come back. It got me looking at live data and notice my long term fuel trims are at or around +10 all the time. I couldn’t find any vacuum leaks. My short terms seams close to zero. Little bit of rough idle, more rough when cold. Both cats replaced at 90k by previous owner. No other codes and the P0157 never came back. I don’t hear any exhaust leaks.

Thank you for the video I picked up A lot of knowledge I have a 2006 Audi S4 4.2 and the problem I’ve been having is with the long term fuel trim bank one is usually lower than bank two sometimes bank one goes up to 8 to 9 on positive as bank two stays around eight and then shoots up to 12 my mechanic and I have looked at everything we didn’t fine no leaks through the intake , maf or any of the vacuum lines and then every 6 to 7 days I get P0492 P0171 and P0174 lean codes what do you recommend will be the next thing to check for go to be maybe I have bad O2 sensors or could it be coming from the exhaust I’m so frustrated trying to find the problem of this issue also I get a little rough idle on standstill as well other than that the car runs great on highway and on full speed. Please let me know your input would be very valuable Also forgot to mention 02 oxygen sensor on bank two reads 0.00 doesn’t move

thanks very very very clear & clean message easy for understanding be cause the way you talk slowly quite really nice way awesome again i say thnks

Very informative. Thank you

Thank you sir. I am having about 28 positive at longtrim. I will check for a air leaking somewhere .

I had the phone plugged into the truck stereo not as noticeable through the phone and laptop. Another good video.

Excellent information here!

Best video.was waiting for the live data on the trims wave forms

Should I be checking theses while idling? My truck seems to be having issues when I am towing and going up hill. No codes, no misfires, took to shop for a trans flush. Dropped pan, all looked good. No metal in pan and fluid wasn’t that dirty. When I punch it, I can feel and hear that my truck is not shifting like it used to, and when I am towing up hill my truck will jump when I’m 1st or 2nd. Once I get pass 2Nd truck seems to run fine. So I have a OBD reader plugged in right now and I am trying to understand the terminology etc. so, when checking my O2 sensors and fuel trim, should I be checking while driving or in idle? Bc when I step on it, my % goes well over 10%. Hope all this makes sense. Thanks for your vids

Thank You!! Very informative video.. but what about diagnosing faulty OSS or (Output Speed Sensor) on Transmission 4.6L? I've already wasted money replacing it with 3 different ones.. still having code, and engine light, and O/D light blinking!! Wires all seem to look fine.

Thank you so very much for your time great video man

It's a good information. Thanks

Great video's on live data. I'm new to reading live data and I need some guidance on how to diagnose a high-idle condition on a 2005 Corolla. Idle is around 1,000 RPM and is a quite rough so I assumed a vacuum leak, but I've checked/changed all vacuum hoses and even replaced the MAF sensor and confirmed no manifold or PCV leaks. Since the car is 18 years old (original owner), I've replaced both O2 sensors and all injectors which improved the vibration level, but it is still present. The last thing I did to the car was to clean out the throttle body (there is no IAC valve). Here are some live-date anomalies (at operating temp) after my last repair: SHRTFT = -20.3% (LONG is 5.5%), TP = 14.9% and will not go to zero even though the adjustment is full minimum, O2S11 = 2.914V (S12 is .095V). Do you have any idea what may be causing the rough, high idle?

Great video!!! Very explanatory! So I been dealing with an issue where my cat fuel trims aren't moving and my bank 1 sensor 1 is reading no voltage

Thanks for the info. I have two longft sensors that are crazy high they are reading 98 and 97. Is that a possible valve or do sensors need replaced. Thanks.

Thx so much for making these :)

Thanks bro fully understood

Thanks for the information, I'm no mechanic, trying to fix an Issue I'm having with my Acura TSX 2009, it's giving me error code P0131, changed the spark-plugs, ignition. coils and even fuel injectors, but problem didn't go away. Car doesn't go over 20 mph ad checkengine is blinking. I got Foxwell scanner recently, but not sure what numbers I should be looking for when in comes to O2! SHRTFT1: -31.3, LONGFT1: -3.9, SHRTFTB1S2: -31:3

Hey great video but I got a question that will stump you.2001 mustang v6 305k miles cats went out .I replaced the factory cats with flowmaster universal and made basically a entire pipe and 2 new downstream o2 sensors.but at idle my b1s2 reads .060 on average b2s2 is at the same but will go up and fluctuate a few times and back down to around .060...do you tft think I may just have the wrong or defective o2 sensors .Car runs great no power loss or smoke.front o2 sensors read like they should .hasn't thrown any codes but won't complete catalysts monitor.

Hey I appreciate your video thank you

It sure would be nice if these chinese manuals would elaborate what each of the readings mean past a simple expanded name when you push the ? mark key such as explained in this video. Thank you.

thanks for the info

Cold air intake will gain power. A lot of factory ecu are calibrated to be a little richer at wide open throttle, adding the cold air intake leans it out a little and gain power. Closed loop is only used during idle and cruising.

This is a very informative video

I have a ford explorer right now where I have negative fuel trim on bank one and positive fuel trim on bank two. That's long term fuel trim. My short term is great. This truck came from another shop and I didn't get a straight story of what's been done.

Thank you for the information, I have a Toyota corolla LE 2012 and I failed the smog test because of 02 sensor and cat but my car did not show any code also I follow a Toyota drive cycle and I drove 360miles highway 55 t0 60 after I slow down without using break just helping the car with hand break to 35-45 but still not ready! but when I plugged my OBD2 IT SHOW THAT MY O2S1 bank1 (V)=3.306 AND O2S1BANK2 (V)= 0.660 the car was warmed up for more than 10 min ! please do I need to change both 02 and after drive it probably it will make the car ready for emission! thank you very much

thank you for your information. l really appreciate it!!!!!!!!

You did great boss man

Excellent Video... much appreciated. I have a 1996 E-150 5.8L EFi . Have ABS light on, OBD2 reader says "This vehicle does not support ABS communication" is that correct ? if so do you know of any other way to identify the faulty sensor (assuming it is a sensor fault) also..... when backing off the throttle the RPM holds, at whatever RPM you were at, for 2 - 3 seconds before dropping.... any ideas ? there is the occasional hickup at idle and sometime it stalls. PCV valve replaced. Any help would be much appreciated. Regards Paul

Just subscribed thanks 4 the info

Good job. Others start with the wheels and after a while get to the fuel.

Great video I have a 1997 suburban 454 3out if the 4 o2s are reading 700ish MV and long term fuel both banks is +9 do you think my o2s are bad? ThNk you for any advice...

Thanks for making this video. It helps me a lot. What numbers patterns indicate O2 sensor is bad? Like, number not moving like your sensor 2?

Great video. I have a vehicle that reads: O2 B1S1 .9mv O2 B1S2 .0mv O2 B2S1 .0mv O2 B2S2 1.0mv STFT bank 1 -20% STFT bank 2 30% LTFT bank 1 -4% LTFT bank 2 30% Inj. duty bank 1 4.4msec Inj. duty bank 2 11.5msec

Thank you. Very informative. My LT Trim is -25% and my buddies got me tracking down a phantom vacuum leak. Now I'm gonna pressure test the fuel system to look for a leaking injector

Great information Thanks

Great explanation...thanks

Hey, nice video man! i like your down to earth style. I subscribed

Good info! Nice Job.

I'd just like to add... In my case, I was getting the 171/174 codes. So instantly thought lean/vacuum issue. So, took a water bottle, and sprayed along the intake manifold along both sides, and sure enough, got the engine to stumble. Replaced the intake gasket, and hooked up the scanner, and during the drive cycle, it thru the check engine light again, with the 174 code. Hooked up a smoke tester, found a cut gasket on the Throttle Body. Then had the smoke tester at 5psi, and saw no visible leaks anywhere, while holding 5psi for several minutes. Reset the computer, and started the drive cycle again. Was watching the fuel trims again, and the long terms kept going higher and higher, and were staying in the 12-15% range through various road conditions, stop/go traffic, up and down hills etc. Then as I was thinking the drive cycle should be completed, it threw the 174 code, AGAIN. So, now I had to change my thinking from "too much air" causing the lean codes, to "not enough fuel"... Because I know there are no vacuum leaks, it has to be on the fuel side. Either clogged fuel filter, kinked fuel line, bad fuel pump etc. So, just wanted to add, that LEAN doesn't always mean "vacuum leak".. it can sometimes mean "not enough fuel"

great video very easy to follow now subscribed

Hi, so good video! My understanding for videos before is that the sensor 2 downstream is not ok and can also be catalysator

2016 Sonata Hybrid 151k miles Idling in Maint mode after 20 mile drive Smooth idle No power loss No mpg loss No rotten egg smell Some lifter noise at slow speed, light accelerator, uphill before gearing down. P0420 New 02 sensor on Bank1 S1 (cat is in manifold) Sensor 2 (in front of lower cat) is factory. Any ideas would be greatly appreciated. 👍 STFT 15.6% LTFT -32.0 02S12 (V) = .790 V 02S11 (mA) 0 to -.05 STSO2FT1 -1.6% LGSO2FT1 3.1% CATTEMP11 (576 Celsius) CATTEMP12 (400 Celsius) LAMBDA11 0.998 ish LAMBDA 0.999 ish

I have a 2001 chevy prizm 1.8 toyota vvt , (no i or 4 , different engines). Should the readings be the same where the O2 sensors or air/ fuel sensor and fuel trim readings are concerned? Thanks. J.

Thx buddy for this information

This is great.. thank you

Got negative ten long term fuel trims a touch higher on bank 1...a bit low o2 sensor readings on upstream...Maf reading at about 4.3...2001 nissan sentra gxe with the 1.8...runs pretty good but a little rough on the idle...cleaned throttle body and iac...experimented with the egr...any ideas?

Hey. Superb video. I have strange problem with short fuel trims. My engine is BMW M54B30. On bank 1 i got +25-28%, but on bank 2 it is ok 0 to 5%. I know that my oxygen sensor after cat on bank1 is dead. Is this can affect on fuel trims? MAF is working, I checked rubber hoses and there is no cracks. Help please. Thanks.

Very good details .. but I have problem 😕 open loop fault .. what do u think is the problem

Hello,thank you for the information. I was wondering if you could help me in the right direction? I have an 06 5.7 hemi and I'm getting these codes for Lean fuel mix and I've looked it over and I simply can't find a leak anywhere,it does have an aftermarket intake but I'm not sure if that would be the cause. The Ltft is reading 32% and 21% at idle but they get close to 7% when I'm about 1/3 on the throttle and they return to the previous. I would appreciate your help. Thanks

Good info. Thanks.

Thanks man, great vid with great info!

You're a great teacher lets get this guy more subscribers

Really helpful👌 thanks

Very nice video good info. I'm sitting at idle and it's all negative for stft 25 and ltft 35.2. 2014 gmc sierra but I get a code saying it's to rich on bank 2. Any suggestions

Focus St... After 3 inch straight piping and down pipe...and Intake..my ltft is 13 at idle... I have a Cobb tuner stage 1. No check engine lights. Normal for this turbo engine with these mods because of all the extra air being introduced? Thanks!

I have a 2014 Jeep JK that has had a small engine surge while going down road. At idle, not detected. Least surge is not detected on tach, the up/down is so quick, really doesn’t have time to register. Worst cases, while going up a hill around 35-40mph, by ear it is swinging much more and you can see on tach that it is 50-75 rpm fluctuations. No codes at all. Looking at o2 sensors and fuel trims after engine is in op temp but at idle, o2 upstreams are bouncing all over 75mv up to 800+. Again it is so quick, can not grab a solid number. Downstream sensors however, b1s2 sits around 250mv while b2s2 is around 685mv. While these o2 readings are taking place, fuel trims stftb1, stftb2 and ltftb2 are bouncing between .0 and -3.9. Ltftb1 sits at 0, no movement. It will change when revved up, but still not hanging near where the others are going. Could b1s2 o2 sensor be going out? Could that cause my surge? Shops I have taken it to say no code, no problem without looking at it to see what I’m hearing and seeing. 84k miles on engine and first issues I’ve had. Owned since new.

Thanks, watched video twice. So understand how its all goes together. ? My shortT reading -17. Longt 0.0 so how I'm understanding my issue is not vacuum leaks. Itd a fuel issue. . so my ? Is I have been putting fuel injector cleaner and its not that. So I'm gonna go with a fuel injector is clogged ? So I would have to basically clean all of them because I don't know what fuel injector is they don't label which one would be the one bad right? Thank you so much for your help. I so understand how it works. So what would I do next do I put maybe a direct cleaner to the fuel injectors or do I have to clean each one by hand which I don't even know how to do I'm going to touch them before and I'm a female mechanic for 25 yes. You and wiring electrical was not my thing though I so confused with injectors does this but if you could like give me a little push or something what should I look for I mean what should I do for the injectors and if it doesn't clear up see my fuel pump was a new fuel pump was put in like I want to say maybe a year and a half ago. I'm leaning more towards of fuel injector clogged I think thank you again have a great night

What if you drive a Ford and no O2 sensor voltage can be displayed? My bi directional tool can only display microamps on the downstream sensor, which is meaningless to me. I CAN see voltage on my GM and Chrysler vehicles. Does Ford use a different data point at the ECU to adjust fueling?

Great video

I have a scanner reading on the sensor called Lambda Correction, and it shows a value between 3.5 and 5.0. Is this the same as STFT?

Any ideas as to why at idle, MAF at times goes below 2.0 g/s and Oxygen Sensor Current (B1-S1) goes into the negative? I have 3rd GEN MINI COOPER S

Got P0171 lean bank 1 on 03 S10 2.2 engine , LTFT at 1100 rpm 21.9. STFT 3.1. No vacuum leaks , would you have any ideas ? Thanks , I have 18lbs of vacuum at idle

what does it mean if both my o2b1s1 and o2b1s2 go to a steady 0.20 (could be 0.020 i forget, but point is it's steady and will have pending code) when the fan or stereo is on? when i turn both off, those sensors seem to fluctuate again. also, are the o2 sensors supposed to go to steady value like i mentioned in park? all my o2 sensors (2 banks 2 sensors each) drop to a steady 0.20 or 0.40 in park. or is that a function of not being in closed loop like you mentioned, because i didnt let my bank 1 sensors run long enough (because of the stereo or fan being on)?

hey do the sensor 2's control the long term fuel trims

Thanks professor.....!!!!

Best video in my opinion took time to explain everything and in laymen terms so a bigginer will understand my question is I noticed this on yours and mine off to side there is a question mark and G what do they mean if anything thanks and again video is the best

2001 Toyota Camry 2.2 le , o2 b1s1>>>> 3.25. +/ - 02b1s2>>>>0.050. What is o2b1s1 reading mean ? Your video is very very informative thanks