2004 Chevy Truck O2 Sensor Fuel Trim codes P0131, P0134, P0171, P1133 part 1

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How to troubleshoot Misfire and oxygen sensor codes P0131, P0134, P0171, P0300, P1133, P1381.
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Tools
- Big Larry Flashlight
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- Autel Maxisys Elite Diagnostic Tool w/ U.S. Technical Support
(alternative to the Verus I used)
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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium on my website.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium www.scannerdanner.com/join-sc... There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!
Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

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3 окт 2017

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Комментарии : 191

@tiztiz5839 6 лет назад

I am just gonna say Pete is the luckiest mechanic on EARTH!!!!

@andrewwmacfadyen6958 6 лет назад

Tradditional shop's like Pete's are great places, he has nice setup in nice location and Paul to call in when it gets technical.

@hustlerforgita7538 5 лет назад

Free training Pete

@koncrete7839 6 лет назад

I've had practically the same issue on an old wideband O2 not long ago. Heater signal leaking into the measurement cell. Resistance between heater and measurement cell was something like 35k. Really enjoy your work, hopefully you're getting settled down again after the RU-vid premium saga.

@gixxercorona 6 лет назад

A pleasure to watch this mr danner, honest and straight forward , excellent 👍🏻

@billyyoder8171 6 лет назад

Thank you Paul. I'm happy you're set up on your own site brother. God Bless You and your family.

@ScannerDanner 6 лет назад

Thank you Billy. Things are still uncertain and stressful right now but I am okay because of you guys. Thank you so much for your support. God bless you too my friend.

@Jay_Dahl Год назад

Scanner Danner - you are an outstanding mechanic, and I can't think of anybody else that I would rather trust my car to. You're definitely on your way to heaven, helping so many people (directly and indirectly) with their car problems. But, with a mind like yours, you're in the wrong field. When I see you working outdoors on that Tahoe, under the car, on top of a piece of cardboard, I'm quite certain that you're earning a tiny fraction of what your fantastic brain is worth. If you had to do it all over again, what field of work would you have chosen? Take care, and I'm sure I can speak for many in thanking you for your service to society.

@ScannerDanner Год назад

To be honest? In another life, a paramedic or doctor that handles trauma and needs a quick and accurate "diagnosis" would be very attractive. Why? I love helping people! But God's been good to me. I have an online tech training subscription service on my website where I'm teaching people how to troubleshoot electronic and electrical problems on cars and my "classroom" is now global! I have "students" in over 150 different countries now.

@Jay_Dahl Год назад

@@ScannerDanner I know a guy who owned his own machine stop, but he yearned to be a paramedic, and all the life-and-death action that comes with the job. For a couple years he volunteered with the local fire department, riding in ambulances to assist the ambulance crews. After a couple years the Fire Department hired him full time, and he sold his machine shop. True story. The most interesting thing he told me was that in some of these rural areas, when you call for an ambulance, the ambulance driver/paramedic does the whole job alone! I'm sure you would be most welcome in a town like that, with no training whatsoever.

@baxrok2. 6 лет назад

Nice fix! I like how the downstream helped you out. Thanks!

@SmittySmithsonite 6 лет назад

That was interesting - like the sensor was shorted internally to the heater circuit. Never know what you'll see these days! Glad you've got the Premium Channel straightened out. What a nightmare that must've been! Thanks for all you do for us! God bless.

@ScannerDanner 6 лет назад

It still is brother. But I'll be okay once everyone comes over. In the mean time it is a little scary. The streaming service and bandwidth is ridiculously expensive. More than I initially thought.

@SmittySmithsonite 6 лет назад

Sorry to hear that. I'm sure the majority of subscribers wouldn't mind if you had to increase the monthly fee to cover all of that. Your content is well worth it. Even if it were double, it's still under $300 a year - can't get this kind of value anywhere else for that cost. I haven't had time to sign in over there yet - I'll probably check it out tonight. Got SUPER busy over here all of a sudden. Feast or famine, that's how it always is over here. :)

@ScannerDanner 6 лет назад

Thanks brother. I did raise the rate but onky $1. It will be $11 per month now and I hate that I had to do that. Look forward to seeing you there. Thanks again!

@SmittySmithsonite 6 лет назад

Ahh, it's well worth it brother! I have zero issue with that! I think 99% of subscribers feel the same way. :)

@arthurfricchione6614 6 лет назад

Paul thanks for the quick reply I have joined and ordered your book. Looking forward to all your videos and help. Thanks Artie

@ScannerDanner 6 лет назад

Thanks Arthur!

@ellobo8593 6 лет назад

My boys back with another one.

@mohamedelshamy2706 6 лет назад

you do not know MAN how I respect and like you.... thanks Pule

@ScannerDanner 6 лет назад

Thanks brother!

@robinsonsmotorcycleandauto3929 6 лет назад

Great Job Paul I was thinking the same thing it was looking like a duty cycle type signal which the heater uses which would make sense when first started o2 heater would have a higher demand then as it warms up it drops and so does your signal goes to reading lean. Dont think I've ever seen one fail this way. Very interesting

@ScannerDanner 6 лет назад

I don't think this heater circuit was PWM but I'm not totally sure on that. That would match even better if it was right? I should have verified the sensor ground for you guys on this one, just to prove the O2 was the issue. I just couldn't get my fat ass under that truck :-) A new O2 did fix this. Unfortunately given how busy things were, I couldn't come back to do a follow up for you guys.

@robinsonsmotorcycleandauto3929 6 лет назад

ScannerDanner If it is it would be on ground side as I know they have constant 12 volts to them as there's fuses in fuse box for them it's been awhile since I've had to test one surprisingly so couldn't say for sure either. In any case we appreciate any time that you give us so no worries on the update we know you have tons on your plate.

@domls1317 3 года назад

Thank Scanner Danner. My truck had those same 4 codes. But mine was a 2012 Silverado 5.3. But when I put the scanner I was getting the same readings for both upstream 02 sensors. Went to check the driver side and one of the wires was rubbing on my transaxle shaft and was missing a piece of wire. I spliced in a piece of wire and put the scanner back on. It was still basically having the same readings. Going up and down. It would go from 0.750 down to 0.090 and then 0.660 and then down to 0.400 and back to 0.100. Both upstream sensors were fluctuating the same way while the downstream were staying steady at 0.650 -0.800 or so. I took the truck for a long drive and the check engine light went out. I had 9 codes and now its showing only four. Even though it had nine codes they were basically only four but repeated twice and one was repeated 3 times. Hopefully that's the problem. I already ordered both upstream and will replace them when they arrive

@ScannerDanner 3 года назад

Check to make sure your O2 heater circuit doesn't have a blown fuse. There may be specific fuses for it.

@theadventuresofjavier8698 6 лет назад

Dang good to see you Paul. It's been a while..will watch now..wanted to say hi.bless you bro

@ScannerDanner 6 лет назад

Thanks Javier! bless you too

@treymusser4197 6 лет назад

The shirt is coincidental... Trying to watch the pens game right now and instead I'm distracted by scannerdanner!!! 👆🐧 worth it!

@ScannerDanner 6 лет назад

And we still have Haglin!

@richard1835 6 лет назад

Man I am ready to learn. Thank you Paul.

@1quickchevy2 6 лет назад

Almost looks like the 02 heater's duty cycle. Signal wire shorted to heater circuit? More voltage/ duty cycle on the start than reducing as the exhaust heats up.

@ScannerDanner 6 лет назад

Agree, but internal to the sensor is where the short was, nothing external was shorted or damaged.

@rondurham9140 4 года назад

Wow, what an education regarding O2 sensors. Definitely beyond my skill level. Now to find a mechanic that knows that much himself. Probably have to go to the dealer?

@ScannerDanner 4 года назад

Maybe, if you are on Facebook, post your location and needs on my ScannerDanner page and I will share it with my global community. I have garages all over the world using my teachings. I was recently able to find a guy in Tasmania to help someone in need.

@mikeoneill7360 6 лет назад

Awesome video Paul, some of the best on the net.

@ScannerDanner 6 лет назад

Thank you Mike!

@deepsquat600 6 лет назад

Caleb has gotten much better with the camera work :)

@ScannerDanner 6 лет назад

He has! I'll tell him you said that.

@Ashroyer86 6 лет назад

Good info on bank numbering.

@alexmessina7652 6 лет назад

Paul, a theory in the O2 frequency pulse: I was thrown by this on a Wideband signal that came out looking like a square wave. I worked out eventually that the signal was shorted to the heater ground and, because it's ground via a floating ground but was not being pulled down to body ground at the PWM heater frequency, it was producing a square wave instead of a flat line. New W'Band S1 O2 was the fix. Make sense?

@donalddeanemcsemasterasecp1615 6 лет назад

I am Coming To Help You Lol !! I Wish I Could But I am Keeping My Eye On You Keep Up The Great Work!!

@donalddeanemcsemasterasecp1615 6 лет назад

He Has A Gift God Is Good To People That Have A Desire to learn and keep learning he is a great teacher and master mechanic for sure!!

@skiingspike 6 лет назад

i'll keep watching and learning. thank you.

@ScannerDanner 6 лет назад

Bart, if you get the opportunity and want to take a chance. Check out my chapters 4 and 5 (Oxygen sensors and fuel trim) playlists on ScannerDanner Premium on my website. There is a 14 day free trial, so you have nothing to lose. www.scannerdanner.com/join-scannerdanner-premium.html I can teach you all the foundational information on the operation of the 02 sensor, PWM heater controls and sensor bias voltage (the test you saw me do when I unplugged the 02) Hope to see you there! Thank you You can also check out my chapters 4 and 5 playlists right here on my free RU-vid channel. I have scores of case studies you can learn from as well.

@kevinbaker4908 6 лет назад

I have an 03 2500hd duramax p0711 code changed the PSM and the wiring harness in the transmission still the same code do you have any suggestions I will greatly appreciate any help

@randylee2549 4 года назад

Hi ScannerDanner, I have a 2000 Montana Van 3.4, driving just fine right up to 110000 miles....then P0131 and P0137 popped up together. I tried cleaning the MAF and knocking dust out of the air fliter (was pretty plugged) I do not know how long it will take for the codes to clear if that helped, but failing that, if the P0131 and P0137 come together what are your thoughts if it is not a dirty MAF sensor? thanks!

@richardmcwhirter9396 6 лет назад

As always great stuff thanks for sharing 👍👍

@gerrygalvan7313 4 года назад

Hi, Paul. I have the same codes on my 2003 Tahoe. Did the O2 sensor replacement solve the issue?

@mauriciodiaz6890 6 лет назад

Saludos desde chile de un seguidor de tu trabajo

@Pablo_Automotive 6 лет назад

Thank Paul and Caleb :)

@danielgardener8264 4 года назад

Hi.i have a 2001 tahoe with the 5.3.....im getting p1133 code and its seems to only trigger at highway speeds.If im just crusing around at low speeeds it usually wont come on.Any suggestions where to start.oh and when this code triggers.short term fuel is around 0 and long term is around 21.

@GlynRobinson 6 лет назад

Long time no see Scanner Danner! Great video! I'll have to admit pine hollow has taken my video watching time. 😂😂😂😂

@ScannerDanner 6 лет назад

He is a good one to be following my friend. Tell Ivan I said hello okay?

@GlynRobinson 6 лет назад

Ivan is a good one. As well as you. You both know how to diagnose instead of making parts makers richer. Lol keep on!

@dalix1951 6 лет назад

Great diag and video as usual.

@martazkirkwood7612 6 лет назад

I enjoy watching your videos

@ScannerDanner 6 лет назад

Thank you Martaz!

@wyattoneable 6 лет назад

Fantastic work Paul.

@ScannerDanner 6 лет назад

Thanks wyatt

@throttlebottle5906 6 лет назад

are the wires mixed up on that sensor lol, like heater and sensor or shorted together geebus

@keanureeves757 5 лет назад

Just want to see if you can help me out I have an issue I have a 2001 Chevy Silverado half ton V6 4.3 I already put a new mass flow sensor had to buy a second one thinking the other one was not working right but still pops up mass flow sensor low Field if you can please help me understand what's going on tired of putting more money into it especially buying departs what I don't need

@mikeanderson1994 6 лет назад

what if u didnt have an o2 in the car at all what will happen i got a used chevy and the o2 is not even there the place were u screw the o2 in is blocked what would happen in this case do i need to instal an o2 or i could leave it like it is

@ibriheem 6 лет назад

Welcome back has been a long time:)

@ScannerDanner 6 лет назад

I know man, I'm sorry. ScannerDanner Premium move has been all consuming and still is. Thanks for your patience.

@theASEtech 6 лет назад

Thank you, Paul

@flyinhawaiian2839 6 лет назад

Thanks for the vid. How's the Jeep working out as your rolling toolbox?

@ScannerDanner 6 лет назад

It's good! No complaints man. Thanks for watching.

@arthurfricchione6614 6 лет назад

Paul first off long time viewer and another great video. By joining your premium and buying your text which I'm sure both are worth purchasing my question is getting access to the wiring diagrams. Do you purchase them separately is there a way of getting them by joining? I wrote this earlier but guess it was lost in space on the internet. Just wondering if I could purchase all 3 items. Any advice or info would be helpful. Thankful your back up and going strong Artie

@ScannerDanner 6 лет назад

Arthur, thanks so much for your interest in SD Premium. The wiring diagrams I use come from an expensive program called ShopKey Pro, it is around $150+ per month for access to this and is not part of SD Premium. If you are a DIYer, then of course ShopKey would not be very cost effective, so we've created a thread on our forum to help you guys find service info. scannerdanner.com/forum/post-your-repair-questions-here/16-need-service-info-check-here.html Thanks again and I hope to see you on the website.

@robinhockett1191 5 месяцев назад

Thank You about po131

@jaguarpaw5 6 лет назад

Hello sir, I just discovered your channel and subscribed. I just purchased a maximus 2.0A. Just wanted to know what your thoughts of it are? Thanks looking forward to watching more of your channels

@ScannerDanner 6 лет назад

Thank you so much for subscribing. I'm not familiar with the maximus 2.0A

@jdean399 6 лет назад

Hey Paul, any new vids on premium yet? Also will we get email reminders to say new video out? Great stuff thanks

@ScannerDanner 6 лет назад

Yes, there are actually three of them, all in my Basic Electrical Concepts playlist, and in the New Videos list on the main ScannerDanner Premium page. I sent out a notice on FaceBook, so if you have a FB account, be sure to follow me there. Secondly, we are working on an email system right now that will give subscribers a notice when new videos are uploaded (just like RU-vid did). Thanks for your patience and support!

@luisbaez88 6 лет назад

I have the same issue with 03 suburban. Some how internally heater control wire was touching signal wire. I find out by key on engine off it was reading 1050mv as soon unplug the sensor drop to 450mv. In the case i was working i didn't see any type of duty cycle signal.

@ScannerDanner 6 лет назад

nice! Exactly what we has going on here

@nawchovandez998 6 лет назад

how come you didnt talk about using the autel scanner in your video? i wanted to know what think about it over the snap-on!

@ScannerDanner 6 лет назад

I don't have one. I've done enough research to suggest one and I am trying to get the Elite now. We will see.

@s0n0ma14 6 лет назад

Cool flashlight

@saurabhsharma-ts6ky 6 лет назад

hy man remember this "look busy live so easy "

@throttlebottle5906 6 лет назад

about time, I was having withdrawals :))

@Portuguese-linguica 6 лет назад

Hay dan i usually just reaplace all 02 sensors if one go's bad . am over fixing my vehicles?

@ScannerDanner 6 лет назад

I could see replacing or suggesting the other upstream O2, since one has already failed but not all of the sensors. There are two downstreams on this truck as well that absolutely do not need to be replaced.

@offroaddiaries 6 лет назад

Man you're super informative. I have a 3.4 2003 pontiac Montana throwing a code for p0131. After checking live data it works fine, then all of a sudden both line graphs for bank 1 sensor 1 and the bank 1 sensor 2 both 0 out. Occasionally sensor 2 (post cat) will go up and down. Any chance you may be able to give some advice?

@ScannerDanner 6 лет назад

Thank you! When those O2s flat line on you on the same bank, that is suggesting an actual lean condition. O2s are most likely fine. Was it misfiring during this period of time?

@offroaddiaries 6 лет назад

ScannerDanner thanks for the quick reply. Scenario is this. Cold start. Idles fine. Idle for a few minutes then go to drive it and after it hits normal operating temp it starts to throw a p0300. Car starts to hesitate and runs rough with no power past 25% throttle. About to do a fuel pressure test.

@ScannerDanner 6 лет назад

very good approach. Just know that you do NOT have an O2 problem, you have a fuel delivery issue. If fuel pressure shows to be good, focus on the injectors next and maybe even the plugs and wires. A misfire, of any kind, (spark or fuel) will drive the O2 sensors lean (it is a false lean, unburned oxygen and fuel enters the exhaust)

@angelramos5827 2 года назад

Compa por qué no me ensaña dónde está obicado el sensor

@nandor690 6 лет назад

Could that odd signal on o2 be from the heater circuit? Looks almost like an on/off signal

@ScannerDanner 6 лет назад

Definitely. I just wish I knew if this was a PWM heater on this model. I thought no, initially because of its age. But it makes the most sense. Though most PWM heaters are not activated with just the key on and that O2 signal was at 1100mv at times with the key on.

@jakedruga5245 6 лет назад

Thanks for the fast reply. Well here is my real question. Since i graduated RTI i have been in shops that have had me more or less only doing streeing and suspension work. Do to that and a few other reasons i dont want to get into in public setting my basic electrical skills are more or less non existent. I am for the 1st time in my career at a shop that is pushing me to advance my skills and to take my ASE tests. Well i passed brakes and streeing and suspension. But failed a/c. Not b/c of lack of understanding a/c or how it works. But b/c half of the test was wiring diagrams that i dont know how to read well enough to understand. So i guess what im getting to is would you recommend buying a different text book for my basic electrical needs or does your book get into to that kind of stuff? (I did try and find my old one from school but dont know what happened to it.) I do plan on watching all of your videos and showing my boss them to. I also know i want your book but with money tight right know i need to get the book that will help me the Most with electrical right now. Thank you for any help you can offer.

@ScannerDanner 6 лет назад

Jake What you need to do is subscribe to my premium channel on my website. It will be the best bang for your buck and will be like taking my class over again. There is a 14 day free trial and it is $11 per month after that. You will literally be back in class with me. I have also added a "Basic Electrical Concepts" playlist for guys like you. After going through those videos, my suggestion is to start in chapter 1. I hope to see you there.

@ScannerDanner 6 лет назад

www.scannerdanner.com/join-scannerdanner-premium.html

@Nik3T3kk 6 лет назад

By Changing the 02 sensor take care of the P0300??. Because I have a 3.8 monte carlo with a double p0300 code. ..also the car died on me while driving something killed the battery but Idk what it is. What would cause this? That's he only code showing up...thanks

@ScannerDanner 6 лет назад

Did you have O2 codes too or just the P0300 code?

@Nik3T3kk 6 лет назад

ScannerDanner no just the p0300...the code went away now I have a p030 code cylinder 3 miss fire..I checked all the coils the had spark but the #3 didn't. ..could it be the post that it connects to? ?

@codydouglass242 Год назад

Nice truck

@WorkWithCesar 6 лет назад

If the tcc is not disengaging at is specific time wouldn't it cause a stumble? Just wondering why you didn't chase the p0724 code after?

@ScannerDanner 6 лет назад

Completely separate diagnosis for the TCC circuit and not our concern for the fuel trim, O2 and misfire codes.

@ScannerDanner 6 лет назад

And it was a TCC brake switch fault. Not a TCC fault itself. This is a signal that comes from the brake pedal switch and is used by the PCM (as one of many inputs) to unlock the TCC and disengage the cruise control.

@DM-qp7do 3 года назад

Im getting a P0131 and P0151. And one day I got a P0131 02 circuit low voltage. Its a 05 GMC 5.3 so is it a bad ground? What could that be? And the check engine light only comes on when im slowly rolling on the gas in 3rd or 4th gear. So is it telling me its too lean or too rich when I lug it a bit on the throttle?

@ScannerDanner 3 года назад

you need to do some voltage measurements directly at the O2 plugged in, while it is running. If you can get me the voltage numbers on all 4 wires and what the sensor side colors are, I can help answer that question. The sensor ground is a gray wire (most likely) btw

@DM-qp7do 3 года назад

@@ScannerDanner Sorry im just now seeing your reply. I don't know how I missed it man im sorry. Im going to dig into it today and check them all. I'm not an expert but I think what is happening is I wrote a tune for the Air fule ratio to lean out to 12.5 at WOT but the data shows at WOT its just fat and happy at 14.6 at all times no matter what I do. So if im getting low voltage in a o2 sensors im guessing its telling the truck to stay rich when it should lean out. Again I apologize for missing your reply, I feel like a dumbshit for asking you a question, you reply and I miss it. I do appreciate your reply and time thank you. Ill get into it and tell you what I find.

@DM-qp7do 3 года назад

@@ScannerDanner Another thing that is strange is when I'm driving and floor it, it kinda slowly builds RPM but when I hit 35 3800 it wakes up and really gets moving. But its a pig down low. And "Bank 1 sensor at idle is 1190mv Bank 2 at idle is 1780mv also at idle "oxygen sensor B0.80V" "Oxygen sensor B0.10V" " Oxygen sensor B0.77V" My shitty diablo tuner is showing those all 3 in a row like this.

@ehilerjose 6 лет назад

very good

@skiingspike 6 лет назад

not sure i understand how it read right when you unpluged it. there is not power or reisitance in the circut.

@rusco321 6 лет назад

Do you give a discount to the garage if they stack jobs for you?

@ScannerDanner 6 лет назад

Of course.

@martazkirkwood7612 6 лет назад

Could a bad catalytic converter throw the o2 bank 1 sensor 1 off?

@ScannerDanner 6 лет назад

Not like this my friend.

@jacquesdaoud4263 6 лет назад

123 bom done that is scanner danner love it

@theASEtech 6 лет назад

Hey, Paul, I see something here Why B1S2 is not working up/down like B2S2 Is something affecting both sensors in B1 O2s Upstream/downstream the B1S1 is lean and B1S2 stays at rich instead going up down thank you( minute 9:43)

@ScannerDanner 6 лет назад

Because the cat is doing it's job on Bank 2. It shouldn't be swinging up and down like the upstream

@ScannerDanner 6 лет назад

Sorry, I should have watched that part first. The cat WAS NOT doing it's job during those frames but I didn't really have it warmed up either.

@Speedstack21 6 лет назад

How come the truck went from open loop, to closed loop, back to open loop, then back to closed loop? Shouldn't it stay in closed loop once the right temperature is reached? Or is it normal for it to bounce back and forth when it teeters on the threshold?

@ScannerDanner 6 лет назад

Because when fuel trim maxes out, the system is recognizing a fault and will default to open loop. Or in other words, O2 sensor problems will cause this condition.

@Speedstack21 6 лет назад

ScannerDanner Thanks for answering my question. I bought your ebook, and am still learning. On a side note, I was able to pop my wife's trunk open using the control side of a relay when she locked the car (windows open) and the keys were in a beach bag in the trunk. So a big thank you for teaching us RU-vid viewers things that can get us out of being stuck in a beach parking lot 👍👍.

@michaeldunagan8268 2 месяца назад

@9:29 Check the wiring. I misolaced my multimeter. Thus, I rolled the duce on a new Denso® oxygen sensor. It was more dead than the ceby in this video: flat-lining at 185 mV. STFT +50. LTFT +25. Oh-I lost the $65.00 + 10% sales tax bet. New O2 is just as comatose. 1997 Chevrolet Express 1500 5.7L V8.

@jakedruga5245 6 лет назад

Paul is there a way i can get in touch with you one on one ( email or messenger or how ever you would like.) I am a Rosedale Tech alumni and i have a few questions about what you are doing and what would be the right thing for me to advance my career.

@ScannerDanner 6 лет назад

Of course jake. But I also have 100,000 other people that want the same thing from me so be patient okay? The best thing would be to join my forum at www.scannerdanner.com and post your questions there. Hope to see you on the website.

@tiztiz5839 6 лет назад

Just when I think I can be the first one there is already. 1000 ahead of me ....,

@ScannerDanner 6 лет назад

haha thanks man

@ScannerDanner 6 лет назад

tiz tiz was actually complimenting me rafael

@javiermichel4618 6 лет назад

Do you have any idea why my both my fuel system would say it's OL fault ?

@Discretesignals 6 лет назад

J Michael G. Any trouble codes stored? OL fault usually means the pcm detected some type of fault and is forcing open loop operation.

@ScannerDanner 6 лет назад

exactly what Discretesignals said. You should have trouble codes with an OL fault. And DO NOT be in a rush to replace your oxygen sensors. Vacuum leaks, MAF sensor issues etc can cause OL faults too

@javiermichel4618 6 лет назад

My codes are p0132,p0152,p1164,p0135

@mikeburton1733 6 лет назад

Last OL Fault I've seen was caused by a huge vacuum leak on a pcv hose at the intake. Fuel trims were all showing zero during fault.

@MechanicTechnicianRepair 6 лет назад

Nice. Video. Tech. Exselecte diagnostic. Saludes noelmatute. Ke. Bueno dia. Ke. Tienes. Mucho trabado

@ScannerDanner 6 лет назад

thank you!

@starrauto6533 6 лет назад

Did you notice at 17:35 the b2s2 o2 sensor switching like the upstream one on bank 1? Looks like there may be a bad cat on that side as well

@ScannerDanner 6 лет назад

I didn't notice until you pointed it out. It certainly doesn't look good but we also need to remember this engine was not running long and that cat may not have been hot enough yet. Good eye bro

@starrauto6533 6 лет назад

***Sorry, I meant at **12:55*****

@throttlebottle5906 6 лет назад

up next 2004 Chevy Truck with P0420 Catalyst System Efficiency Below Threshold ;) errmm P0430 sounds better. mixed up the left's and rights :)

@starrauto6533 6 лет назад

That is possible and would require further diagnosis once the engine is warmed up and running properly. The reason I pointed it out was because it was on bank 2 and the o2 sensors on bank 2 seemed to be operating normally (bank 1 was the issue side with the failed upstream o2 sensor). I Just thought it might be something that was worth looking into to avoid a comeback with the check engine light on again

@throttlebottle5906 6 лет назад

catalytic converters, who needs'em, where's my sawzall and straight pipe ;)

@Baba_Yaga888 6 лет назад

are u posting any new videos on ur premium website yet?? I'm just waiting to subscribe there until you start putting new videos there basically because I've watched almost every single video on ur premium channel already??

@ScannerDanner 6 лет назад

Nice! Thank you! Yes, there are three new videos up right now in my Basic Electrical Concepts playlist. I have a ton more videos ready to go too but since we are still working on the site, time is limited. I do plan on getting at least two more videos up this month as well.

@ScannerDanner 6 лет назад

@NeilWatson 6 лет назад

Jeep Wrangler TJ 1997 4cyl 2.5L, I see a small spark at night at the front of the motor at the tips of the corner of the bolts that hold the thermostat, I cant's find a short, but when I up the RPM's the spark increases in it's glow, my Jeep is running so lean the header glows red hot, only code that showed up was "Open Fuel Circuit Loop... Can you be as kind to tell me the cause, been months and no one has been able to figure it out ty

@ScannerDanner 6 лет назад

Are there computer ground wires that bolt to the thermostat housing? Make sure they are right. A lose ground can do some crazy things.

@NeilWatson 6 лет назад

I almost rebuilt this whole thing, didn't see any, that really messes with my mind... I have an idea now what I should keep looking for, I had a feeling it could be some kinda short... This little problem is the only thing holding me back, may I will add some ground wires and see if it helps... I been up and down this Jeep... Thanks you a bunch

@NeilWatson 6 лет назад

Get a load of this I figured it out it was static electricity from the serpentine belt the pulley and harmonic balancer I need to find a way some kind of dielectric or something to stop the static but I used wax and it temporarily fix the problem and the spark stopped

@starrauto6533 6 лет назад

I’ve seen aftermarket drive belts (mainly the Goodyear gator back belts) cause this on a couple of cars. You can actually hear an intermittent snap and see a spark when it happens. Only way I was able to fix it was to install factory belts and that took care of it. Hope this helps!

@NeilWatson 6 лет назад

That's the exact belt I have

@gbowne1 6 лет назад

Ok, so.. 2:45 EVAP is Venting in open loop. Trim learn is disabled? B1 ST trim is - numbers. Indicated OS on all but B1S2 as it just started warming up ~10deg. missing something?

@Discretesignals 6 лет назад

gbowne1 The evap vent valve is open, but the system has 0 % purge going on. Evap vent valve is normally open unless the pcm is performing an evap system leak test. The evap system is not purging.

@ScannerDanner 6 лет назад

Not sure what you are asking me. The vent solenoid is always venting unless an EVAP leak test is being performed. "Fuel Trim Learn" is a useless data PID. STFT on bank 1 is negative because the O2 signal during this period is biased high (more than 450mv) due to the heater circuit bleeding into the signal.

@gbowne1 6 лет назад

ScannerDanner, I saw later that it went to enabled and closed loop. Useless PID or not. Does it normally bleed into the signal in this? Just trying to see if I got what I saw straight. Open with no purge? Ok. I just saw that the bank 1 STFT was 0. when the others werent. Didnt catch the bias V.

@armandonika 6 лет назад

Did you filmed the other cars?

@ScannerDanner 6 лет назад

Yes and I added links in the description. Also the ! icon on the screen while I was showing the other cars.

@armandonika 6 лет назад

+ScannerDanner 😂😂😂didn't noticed man i already saw them 😀😀thanks anyway!

@keunsupark9180 6 лет назад

I introduced this video to my Korean friends through Facebook. I also reviewed the subtitles.

@MinhTran-tj4wq Год назад

Anyone can help me. I have a cheap scanner and trying to fix my Pop Chevy 2005 Colorado. There is a P0446 and p1133. O2B1S1 is showing rich and O2B1S2 is also showing rich. Both O2 seems to respond well to throttle. LT is -14 which make sense to compensate. So my first thought is vacuumed leak or MAF. So I cleaned the MAF and it brought LT down to -2. O2 came down a little but still rich. Could the P0446 caused the lean condition? Trying not to be a part changer and since downstream O2 also showing rich. And respond 1:1 with up stream. I ruled out upstream O2 as the problem that triggered p1133 code. My guess is because it remain 95% on rich, that’s why it trigger p1133. What also trouble me is the downstream fluctuate up and down on rich side (wave sign). I was expecting down stream to be stead instead of having a sign wave like up stream. Still learning so please be kind.

@ScannerDanner Год назад

What's the definition of the P0446? Most likely two separate issues

@MinhTran-tj4wq Год назад

@@ScannerDanner thank you Paul. P0446 is a EVAP Control not switching. I have no other EVAP codes such as small leak or large leak. Without knowing which of the 3 component is bad I checked the EVAP Purge Solenoid first and find that is working correctly (I.e close without power and no leak and after engine warm up it opened) I then looked at your video on how to test EVAP Tank Pressure sensor and found that the sensor was reporting low voltage all the time even when the gas cap was off signifying high pressure which was not accurate. I did the wire integrity test based on your video (Thank goodness for that video, I would of testing the ground with the 5v reference and possibly fry something if I did not watch your video. After replacing the Fuel Pressor sensor, I was reading the correct value around 1.5v. I drove the car around a few time but the EVAP test hasn’t fully complete. However, normally the Component error code would pop up by now. I will update after the EVAP has completed it full test. You are my hero and I have learned so much in the past few from all your videos to help me narrowed down the issue. Finger cross. I’m trying not to be a part changer. My Dad send his love ❤️ because he was worried that he bought a useless old truck. I do have some bad knews for him. Looks like the old owner has been running this truck rich for a while and the CAT might be bad. Down stream o2 is not looking too good. Did not do a pressure test on his exhaust but I have a feeling it won’t be long until it needs that too. Your ST LT and O2, MAF videos really gave me an amazing understanding of how it works. I never worked on car before and thank goodness there are great teachers like you out here. I brought my Lexus out to a local mechanic and he replaced O2 last year only to have the same code come back in a few weeks. I took what I’ve learned from your checking trims and after I cleaned the MAF, hasn’t seen and codes for awhile now. Much appreciations.

@ScannerDanner Год назад

@@MinhTran-tj4wq the P0446 is a specific fault (vent solenoid) and is not going to be related to your rich condition. Lets move this to my forum. It is free to join and we can help you there. www.scannerdanner.com Let me know when you post it and I will jump over and help too

@muleblues71 5 лет назад

The scanning reminds me of ghost hunters

@rogerpatrick3642 5 лет назад

But good work 😜😜

@Theview24 6 лет назад

What are those % supposed to be?

@ScannerDanner 6 лет назад

% of what? Fuel trim? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oRX2V6_a3dc.html

@Theview24 6 лет назад

Thank you for the teoly and link to the video

@ozzstars_cars 6 лет назад

That was a lot of codes for a wacked out O2 sensor

@ScannerDanner 6 лет назад

for sure!

@codydouglass242 Год назад

5.7 Chevy old body style

@Ashroyer86 6 лет назад

I don't think you're getting paid enough Danner. I could be wrong I guess.

@ScannerDanner 6 лет назад

:-) RU-vid and you guys have helped with that. Thank you for watching!

@Ashroyer86 6 лет назад

ScannerDanner no problem keep them coming. You and real fixesreal fast are the most knowledgeable I have found on the tube.

@RVerJerry 6 лет назад

I thought you were going to quit RU-vid! Explain please.

@ScannerDannerPremium 6 лет назад

Just my paid channel. And it wasn't me quiting, it is RU-vid shutting all paid channels down Dec.1 2017. I've moved all of my premium channel to my website where people can continue to subscribe there. I will still continue to upload free videos here too. I need this channel to market what I do. Make sense?