how to read 02 sensors, short and long term fuel trims
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- Опубликовано: 13 фев 2017
- How to read oxygen sensors and short and long term fuel trims. I go alot more into detail about everything. If you have any questions just leave them in the comments.
Easily the best video on o2s and trim I've seen.
No BS
Straight up knowledge.
Excellent video.
Thank you
Exelent explanation on how this o2 sensors work. It might take me 20 times to see this video but you went really well.. Thank you 👍🏻
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!
Thank you for teaching me how to read my sensors, you are a life saver. Awesome video.
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!
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:)
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
Good video bro. I've been twisting wrenches for yrs,but I needed to understand my 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 🤙🏽
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
WoW hat's off sir what a great and deep and easy lecture with live data streaming salute sir
This is an incredible video !!! Amazing explanation on live data
i'm starting to understand this whole thing.Thanks man
One hell of an informative video.
Thanks man for clarifying these readings, so useful!!
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
Great video bro, good way to explain everything in easy terms to understand
It’s very good explanation video, Make me more understanding about the STFT and LTFT Thank you
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
Perfect, the way you explain 👌👌👌👌👌
All the way from south africa
Your doing a good job keeping us informed thank you
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
Now I finally got a little understanding about this. Thank you..
Bro..... great video. Please keep em coming. Best descriptive video ive seen in a long time
Real good explanation of FT.
I had the phone plugged into the truck stereo not as noticeable through the phone and laptop. Another good video.
Bob Wolf thank you I appreciate that!
You do well on explaining as well diagnosis
Knowledge is great for self taught good job
Thanks a bunch! VERY Helpful!
Best video.was waiting for the live data on the trims wave forms
Thank you sir. I am having about 28 positive at longtrim. I will check for a air leaking somewhere .
Excellent video. Thank you.
Very well explained great video help me out thank you
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?
Smoke test
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.
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.
Very informative. Thank you
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
It's a good information. Thanks
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
Mark Dziamski hey did u find the problem minds is -3.1
@@jarademajor8401 -3.1 is perfectly normal !
one of my short terms is + 25
Sounds like you got a stuck open injector.
Your buddies are exactly wrong. -25 means the mixture is extremely rich. That's not a vacuum leak. It is the exact opposite.
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
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
I have a 2002 Suzuki areio it codedass air flow sender and throttle positioning sencer changed both with new ones and my car won't stay running it won't idle at all have to playing with my gas peddle to keep it running I let the gas ho will idle for a second and die could it be my fuel pump or 02 sencer
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
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?
Excellent information here!
Just subscribed thanks 4 the info
thank you for your information. l really appreciate it!!!!!!!!
Andrew Villanueva Yup Np problem, if you have any more questions feel free to ask!
Thx so much for making these :)
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.
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?
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
thanks for the info
I have fuel trim bank 2 permissibile range excedeed cod on my bmw e39 520i what should i do ?
You did great boss man
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.
Thanks bro fully understood
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.
I am getting a code of Oxygen Sensor pumping circuit Bank 2 Sensor 1. I had it reset after I replaced the o2 sensor but it came back twice with the same reading. What am I missing?
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.
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!
2004 mazda mpv 3.0v6 long term ft 2 says 14.8 cel comes on from time to time maybe 2x a month p0171 & p0174 did the spray thing all over the intake manifold cant find a vacuum leak . Short term stays between 0.1- 0.8 while viewing live data . Sum 1 help..
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?
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
This is a very informative video
Hey I appreciate your video thank you
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.
On a cold start, does the oxygen sensor post cat heater command need to be at 100% or its okay to have a a 10% value ?
hey do the sensor 2's control the long term fuel trims
Great information
Thanks
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
P2195 and p2196
Pipe going to muffler broke, replaced muffler but no pipe after new muffler right now.
great video very easy to follow now subscribed
Question? Have a 2004 honda Civic ex and my back oxygen sensor had a p0139 code and went and replaced the sensor but now that p0139 code went away but now it's showing a p0141 code and that is coming from the new sensor. This sensor was replaced last Sunday.
Thanks man, great vid with great info!
codybroken thank you, much appreciated!
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)?
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
You're a great teacher lets get this guy more subscribers
Hey man I seriously appreciate that! More videos coming very soon!
Thank you so very much for your time great video man
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.
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?
got a 09 qx56 infinity, longft1 -3.9 shortft1 -3.9 longft2 -7.0 shorth ft2 3.1 02B1S1 2.47 02B3S1 2.255 02B3S2 0.080 02B1S2 0.050, getting p 0420 code, change bank1 sensor 2 and MAF sensor, CEL stayed off for a day and back on now. took off exhaust bolts and was told CAT looks fine, any advise.
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...
Great explanation...thanks
I have an O2B1S1 reading 3.39+/- Voltage. Any idea what that might be? ...or should I just replace the Sensor 1st? 2001 Toyota Tacoma w/ 160k miles.
Good info. Thanks.
What should a normal downstream 02 be reading??
Hey there question, so in the same way learned by doing the work myself cause I couldn't pay someone but I'm lost when it's coming to this 02 to short term trim stuff. I have a shrtftb2s2(%) 99.2 and my longft are at 25. I have replaced my intake gasket and put old but good I believe 02 sensors in and it shows my 02 sensors are working and shrtft are working fine. Where should I go from here? 01 Silverado. Truck runs bad in open loop then better in closed loop but still not like it should. Any help would be great.
even though its years old comment,,,,someone might need it,,,,you have a vaccum leak,,,
Long term fuel trims on bank 1 & bank 2 is about 25% what are the possible on that?
Hey, nice video man! i like your down to earth style. I subscribed
I have a 2003 Landrover discovery 2. Put all 4 new o2 sensors . Still dont read on scanner. ? Any idea?
hi does anyone know what it means if i have a stft b1 s2 (%) NA and a stft b2 s2 (%) NA ? Hope someone can clarify this for me thanks.
sensor 1 bank 1 p0172 code any help 2008 chevy impala v 6 3.5 literflex fuel had a code p0446 changed canister and vent purge valve the issue was solved then a couple days later got the p0172 code any feed back would be appreciated
And that’s why the screen has all that info; makes it easy to understand.
Good job. Others start with the wheels and after a while get to the fuel.
Thx buddy for this information
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
Can a o2 sensor effect the particulate filter on a diesel engine?