Oxygen Sensor Slow Response test (P0134) - Nissan

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An oxygen sensor slow response or low activity trouble code is almost always a faulty oxygen sensor. There are a few other things to consider before replacing the oxygen sensor. Exhaust leaks upstream or very near the oxygen sensor as well as oxygen sensor heater circuit malfunctions can also set this code.
Engine Performance Diagnostics chapter 5
Symptoms
- check engine light (P0134)
- poor gas mileage
- rough idle
- runs fine intermittently
Fix
- replace faulty oxygen sensor
Tests shown
- scan data O2 analysis
Tools used
- scan tool
Playlist
- (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing
• (Chapters 4 and 5) Fue...
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- What can cause an O2 sensor to read near 5 volts? (Chrysler bias voltage) • What can cause an O2 s...
- Engine runs rich P0172, P0175 from a blown O2 heater fuse (Jeep) • System Too Rich P0172,...
- O2 sensor testing (fixed lean) P0174, P0154, P0155 - Mitsubishi
• O2 sensor testing (fix...
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.scannerdan... 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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8 сен 2024

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Комментарии : 162

@Sloppyjalopy123 7 лет назад

My dad teaches auto body at our local college. Best perk of that is he can check out any tool I need from the mechanic side. Thanks for humbly sharing your knowledge.

@DaveSender66 8 лет назад

Thanks Paul for making these videos ! You help me fix an 02 sensor problem in my chevy truck 2 years ago. I very much appreciate you passing along your knowledge to us!!!!

@ScannerDanner 8 лет назад

+DaveSender66 thank you!

@wyattoneable 8 лет назад

Thanks again Paul. I mentioned this before (and thank you for the response) but the organization in the description box is really helping me stay on track.

@ScannerDanner 8 лет назад

+wyattoneable awesome, thanks again

@aldoladrondeguevara7259 Год назад

Always watch your videos, you know your stuff.. that scanner is worth more than my car 😆😆

@nickayivor8432 2 года назад

Good Morning Sir ScannerDanner have a great day, take care Sir ScannerDanner Great tutorial thank you very much 👍 🙏 From Nick Ayivor from London England UK 🇬🇧

@wilamyoukhana1109 2 года назад

Your the best teacher boss

@jcmtomal 3 года назад

Have my bank 1 running bad for 2 years straight. Will try to look into the graph. Thanks!

@larrygibbons6489 3 года назад

Excellent Instructional Video !!!

@marco320033 8 лет назад

love the new scanner !! awesome job

@integrab21a1 3 года назад

Lol

@mitsuevo8mr 6 лет назад

Great video man!thanks!

@MrGarcon98 8 лет назад

thank you i bought a 2012 maybe its next LOL ,,,always good vids from you and i thank you .

@mr.hammer7080 Год назад

I’m blown away 🎉🎉🎉

@lancerwrx40 Год назад

Good teach, very happy

@davesministry7789 8 лет назад

Quick and easy. Thankyou

@Garagemx1 2 года назад

Whats the cheapest version of scanner you can used to graph?

@davekleiboeker4614 Год назад

OBD 2 with live data about $35 on the net and $50 at your local Walmart

@bugboogie2851 6 лет назад

nice video.....lazy o2 sensor.....

@luisbaez88 8 лет назад

good video slow response from o2 most time need a sensor. But im waiting for the knock sensor diagnostic nissan always have a trouble code with it.

@ScannerDanner 8 лет назад

+Luis Baez rendering the video now. I'll have it up in a few more days

@HeyBirt 8 лет назад

I had a similar issue on my wife's Suzuki Vitara a few weeks ago. She called after a 100 mile trip saying the fuel mileage was low (did not tell me CEL was on!) I scanned the car and had a Bank 1 Sensor 1 Low Activity code BUT I had replaced both up stream sensors last year (faulty heater in one). Both upstream sensors when graphed appeared to be functioning properly but the Bank 1 downstream was nearly dead, only a blip here and there. I reset the code and ordered both downstream sensors, a week later when I went to replace the sensors I scanned it and noticed I had the Bank 1 upstream low activity code again. I replaced both downstream sensors (does not seem to make sense to replace one when they have both been in there for 120K miles) and that fixed the issue. It still seems strange to me that the PCM was setting a false code for the upstream sensor when the downstream was bad.

@lifepresent3183 6 лет назад

Maybe they messed up labling the wires to the software writing on the PCM at the factory

@Ashroyer86 Год назад

Maybe the computer just compares the 2 and isn't accurate enough to determine which sensor it is.

@JC-wh9pj 5 лет назад

You are the master...........of disaster 👍🏻

@adamzan7 7 лет назад

Would I be correct in replacing the sensor, if I have similar voltage readings on the same bank, but no code for the o2 at all? I'm working on a 2002 Xterra SE Supercharged, and the computer is limiting boost once it reaches closed loop. No other codes, new knock sensor. The only oddity in the data is that one front o2 sensor reading. Fuel trim on that bank is also always roughly -5% more than the other bank as well. I'm no mechanic, just a DIY'er with a a bluetooth odb2 adapter and a smartphone.

@ScannerDanner 7 лет назад

If you have a boost issue, I doubt it is O2 sensor related

@jesusmalagon4336 8 лет назад

thanks paul danner

@stevennahulak6768 7 лет назад

After watching this video, I"m still confused about one thing. Can you please shed some light on this. When manufacturers changed from oxygen sensors to air/fuel ratio sensors, is it safe to assume that we are ONLY talking about the upstream sensor and NOT the downstream sensor? That sensor should still a normal oxygen sensor. Please comfirm. Thanks Steve

@ScannerDanner 7 лет назад

Yes, when they use an upstream AF sensor the downstream is just a regular narrow band O2

@chamanavenkatesh Год назад

sir Chevrolet spark 2013 model oxygen sensor bank 1 and bank 2 sensor are same or not ? actually bank2 sensor not working but ihave extra bank1 sensor so can i fix the bank1 sensor place to bank2

@joehyundaitech7961 10 месяцев назад

paul i have a 2003 ford focus 2.3L I had a engine light on and a code for a PO133 I erased it and it has not returned and it has been months should I still replace the sensor ?

@Turbotomass 8 лет назад

Great info.

@GlynRobinson 8 лет назад

down stream O2 flat lines after engine starts. it takes several minutes before any signal shows up. the two up stream O2's oscillate like they should. would this situation cause a P0171 P0174 codes? this is a 4.0 OHV Ford Explorer.

@jbissey1990 8 лет назад

Great video as always. I was watching one of your videos on the premium channel that i just subscribed to the other day and i had a random thought when you brought up a bad ecu. Im going to buy a pass thru device so i can start doing programming, updates, and all that other good stuff. A lot of my customers are starting to get newer cars that require pcm updates every now and then and i would like to be able to perform those services for them. Right now i just borrow my friend's pass thru that comes with the autel if i really need to. What device would you recommend i start off with? Thank you for your time.

@ravit928 Год назад

What’s the name of the school you teach? And the program you guys teach there

@johnbickle4654 Год назад

HI I have a 2009 vx astra 1.4 petrol car had misfire hole burnt centre of no 3 piston fitted new piston chain kit etc had 1 code stored for lambda bank 1 sensor 1 circuit new sensor has fixed that fault any quick easy test i could do to make sure the car is not over fuelling car is starting running spot on atm but little apprehensive to take it out on the road any advice greatly appreciated 👍

@atomicdmt8763 Месяц назад

ever see ISSUES coming from exhaust not grounding out properly? ie: bad connection to the engine, therefore battery terminal connection- is off: and / or due to incompatible antiseize compound?

@ScannerDanner Месяц назад

Causing O2 issues? Not since they went away from single wire O2s. Today's O2 sensors do NOT use the exhaust for a ground

@nsmeltzer 6 лет назад

Got a quick question for you: I have O2 sensor B1S1 slow response. My car (2006 Kia Sportage) runs on LPG. Should I measure the sensor on petrol or LPG or does it not matter? I figure it doesn't matter since the LPG system is supposed to fool the car's sensors in to thinking it is running on petrol. Either way, I've measured on both and the measurements are 0.05v-0.7v. It never makes 0.8 and is way lower than 0.2. What is that telling me? Failing sensor? Or something else? I'm not a mechanic, but love learning from your videos, so thanks for doing them!

@johnwrench4speed 8 лет назад

Nice video. However, I wish you would get in the habit of viewing the data in OBDII (generic) on these types of issues to get a more accurate reading (i.e., without enhanced data interpretation). Also, I think loop status will be displayed.

@ScannerDanner 8 лет назад

+johnwrench4speed I wouldn't call it more accurate but yes, I forget about global obdII sometimes

@Delfi1900 5 лет назад

Niiiiiiiiccce!!!!,, thanks 🙏🏼👍🏼👍🏼👍🏼

@billyr9840 8 лет назад

Nice !

@randy1ization 5 лет назад

i HAVE AN AUTEL 519.. how can I check my o2 sensors with just the number readouts. both banks are throwing codes ,, 420 and 430

@haywardsautomotive6156 8 лет назад

I love my Verus Edge with Gorilla glass, SSD, Windows 7 Embedded, MS virus protection, TSBs, SureTrack, Troubleshooter, Mitchell On Demand...sweet package. Snap-on makes a 12V adapter with either battery clips EAX0066L04B or the lighter adapter EAX0066L10B for @28 for the Solus & Verus models. Battery life is really good plus you can go to Standby mode and reboot in 5 seconds. Plug DC lighter adapter in on the way to the next job and you'll be ready to go!

@efrencerda5459 8 лет назад

Hi what is price of this Verus Edge,.,?

@haywardsautomotive6156 8 лет назад

@$10-12K according to your Snap-on rep and what kind of deal you can get. Good customers usually get a good deal.

@efrencerda5459 8 лет назад

👍 Do you know if can get it online internet.?

@haywardsautomotive6156 8 лет назад

+Efren Cerda Contact Snap-on Diagnostics U.S. CUSTOMER SERVICE Snap-on Diagnostics Customer Service USA: 800-424-7226 Monday - Friday 6am to 5pm PST

@TheJImbolay 8 лет назад

just checking have you done any programing with a j box or j-2434 box just order one it is an autel . would love to see a post step buy step on how to use one .Work on mostly mopar fleet vans 2010 and newer

@arnoldbaclig7709 4 года назад

Hi scanner I have a question on my 2001 Nissan quest I got a code P0134 and P0140 and when you run the car in the stop sign is jerking... actually Iready change the spark plug and I clean the mass air flow and I clean the throttle body too.... hoping you read my msg thanks.....

@heyitschinoable 7 лет назад

Dan i got a problem with a 2016 Altima, has multiple codes for AF ratio sensor slow response? Wiring to ECM looks good.

@abochavez 8 лет назад

do you think a misfire from a dead coil could cause this code?

@dereckc9469 3 года назад

can it cause a stall coming off a red light I tap the gas car stalled but started right up. I got home checked codes there was p0134. car always has p0421 but cats not clogged no emissions here so I am not worried atm. the reason I mention is because I dont know if the p0134 was from the stall or from earlier car idels steady rpm but rough sometimes rides perfect sometimes feel light knock on highway after driving a while almost feels like fuel is off. I also notice o2 dips to 0.00v on scan tool.

@SaucyBegger25 5 лет назад

I have a code p01345e and car is sluggish and check engine light is on. Am I right I’m guessing the code means slow o2 sensor?

@felplayvina 8 лет назад

Yes yes Paul you are suffering too much by using the Verus Edge.. Regards..

@ScannerDanner 8 лет назад

+felplay vina (felplayvina) lol

@JuanMorales-lh4hu 7 лет назад

have you used the MD auto wave? or is it crap and can you maybe do a tool review of it

@khalilkhamisi4321 4 года назад

hi, I need your help: upstream is between 1 to 2.3-volt variable on the graph and downstream is between 0.28 up to 0.75, I have bad smell from the car and check engine is on for p0420 but car performance is so good it is fast and every 2 weeks I put gas, but for short term downstream I don't have data , could you help me for the problem ( Also when I clean the code, after a week it comes back!)

@rankgts3962 4 года назад

Hello khalil khamisi i have the same problem did u fix it bro??

@rankgts3962 4 года назад

I have the same bro did u fix it?

@khalilkhamisi4321 4 года назад

@@rankgts3962 I changed the sensors, still that was same, so I just changed catalyst converter and cleaned the code and after 8 months that code never came back.

@rankgts3962 4 года назад

Khalil Khamisi i changed the catalyst converter and both sensors but i’m not sure if they are working but i get them used but of its not the sensors and catalyst what will be ?

@rankgts3962 4 года назад

Khalil Khamisi btw i have altima 2014 (4 cylinder ) with code P0420 with P1148

@95turbostang21 2 года назад

Hey Danner got a question for you just last night I hooked my scanner up to my son's 08 Chevy Malibu 2.4 so I grahped the O2 sensor before the cat and O2 sensor after the cat raised my RPMs up to 1900 and what I was seeing was both O2 sensors were cycling up and down up and down for about 10 seconds 15 seconds then all of the sudden the rear O2 sensor after cat stayed at a fixed value right in the middle of the graph and O2 sensor before cat was still cycling up and down is this normal.

@aguilarantonioattnt 7 лет назад

very good and simple video. I have a question. can you explain what the other tabs that you didn't click on mean? I see there is one that says heater, that's part of the 02 sensor this you have to replace the sensor as well ?

@ScannerDanner 7 лет назад

Every car is different on what they show data wise. We call the data PIDs. (parameter identification) Without watching the video, I don't remember for sure but if it said heater, this can be an on/off, a duty cycle command, a milliamp draw reading etc. etc. Like I said, every car if different on controls and how they monitor them and report them to the mechanic. Then there is a factory scan tool that will report differently than an aftermarket one like I was using. Hope that made sense.

@randy1ization 5 лет назад

my bank 1 sensor one 02 sensor stays at 0300 at idle and 0.285 at 3000 rpm at closed loop.

@randy1ization 5 лет назад

my bank 2 o2 sensor 2 reads 0,280 at idle and 0.280 at 3000 closed loop

@portlandcrazyslow 6 лет назад

How would one go about checking the heater circuit/H.C. fuse for a P0134? THNX

@ScannerDanner 6 лет назад

A heater circuit ode is usually caused by a bad O2 sensor. With the engine running you need to check the O2 heater circuit for a power and ground. Be aware that some of these are pulse width modulated on either the power or ground side of the heater circuit, so voltage readings will be affected by this.

@Mike-zn8lo 8 лет назад

just curious if the o2 alone fixed this issue or was the extra ground strap per the tsb needed to solve? Have seen it go both ways hence my asking.

@ScannerDanner 8 лет назад

O2 alone

@wtbm123 8 лет назад

Wireless would be nice at times

@trainer2018 8 лет назад

Hey Paul it's Mike on this model do the 02s put out a bias voltage to verify wiring integrity?

@ScannerDanner 8 лет назад

+busjockey1 yes they do and I believe you can see it when the sensor starts to fail

@opexo 5 лет назад

what is the bluetooth tool that you recommend? i don't see it in the details section

@ScannerDanner 5 лет назад

I have one listed on my Amazon affiliate page. You can find that link in the channel art of my home page right here on RU-vid

@murrmann7234 8 лет назад

Hello Sir. What's the name of the type of digital meter I can purchase to measure wave form for DC & AC current. Thanks

@davekleiboeker4614 Год назад

That would be an oscilloscope not a voltage meter

@murrmann7234 8 лет назад

And wave form for volts. (AC & DC)

@ruben85374 6 лет назад

Can a bad O2 sensor bank 1 sensor 1 on a 4 cylinder cause low power?

@ScannerDanner 6 лет назад

yes it can, but it will run good cold and at wide open throttle (open loop conditions)

@AlienBros 4 года назад

Hey Paul I need help. I asked you awhile back about my 2009 Infiniti G37x being a no start which I did manage to get running again. However now I am having codes P0430 and even more reoccurring P2A00 which keeps throwing my check engine light on. I followed the FSM troubleshoot and have narrowed it down to 3 things that it could be either bad catalytic converters which I kind of doubt, a leak which I am failing to find (a weld was done on the passengers side catalytic converter bracket to get it to pass inspection, there was a leak there but it is solid now so I don't think it would be related?) Or bad upstream Air to fuel ratio sensors (the downstreams were recently replaced due to wires being opened on the sensors themselves and bad live data voltage readings on my scan tool). I am not sure where to go from here however there is one live data pid that bothers me which is A/F ADJ-B2 reading at -0.06 when hot even when pressing on the accelerator. B1 reads a constant 0 and I am unsure what Nissan means but that abbreviation or what the proper reading should be in their terms because of it. When it comes to normal terms regarding fuel trim and O2/Air Fuel Ratio sensor readings from vehicles like GM's I have no issue understanding them but I am unsure of how to read a few data pids on Nissans live data because I am unsure what they mean/are measuring. I am just assuming it is related to the code because of the A/F in the A/F ADJ-B2 abbreviation. Could you tell me what it means for certain and what it is the equivalent to in normal terms? I feel it may help me diagnose the issue. Otherwise the vehicle runs fine and the engine is perfect with 0 misfires even at it's max RPMs. I do keep on rare occasions getting a high voltage to the power steering pump code but the power steering system is operating perfectly and not losing any fluid so I was ignoring it and I doubt they are related although I could always be wrong. Injectors are new too so I know they aren't leaking but whatever the issue is does seem to be affecting gas mileage causing it to run rich but not enough to trip a code. I can't find a reliable source to tell me how to understand Nissans consult 3 software terminology. My $2000 scan tool uses an aftermarket version of the OEM software. I may send this to you on the premium site if I can in case you don't see this here since I am a student there. A breakdown of some of this weird terminology would be a lifesaver. I have to pass emissions soon and these codes will definitely cause me to fail. So far the internet has been useless and the FSM has been useless as well so I'd deeply appreciate any help you can provide. If need be I could email you screenshots of the live data off my scan tool. Thanks.

@ScannerDanner 4 года назад

I believe you mean P2A00? You need to address this fault FIRST! DO NOT concern yourself with the cat code until this upstream AF sensor fault is fixed. Also, this code could just be a bad AF sensor, but it could also be other things: fuel pressure, fuel injector, air intake leaks, wiring problems to that front AF sensor

@AlienBros 4 года назад

@@ScannerDanner Yeah that's it sorry about that I was half asleep when I was writing that out and I wrote it wrong. I corrected it haha. I will check on the fuel pressure and the wiring and get back to you on that after I check it. Fuel injectors are brand new OEM ones with a warranty so if they are leaking that will surpise the heck out of me but but I can alway get new ones for free (I replaced them because the old ones were leaking bad and caused the oil to stink of gas which it no longer does since I changed it the day they were replaced) if they are. I had sprayed carb clean around and checked for fuel trim differences on my scan tool when I sprayed it as well and couldn't find anything and I definitely can't hear any leaks so I am at least certain it isn't an air intake leak. I will let you know what I find. Thank you.

@AlienBros 4 года назад

@@ScannerDanner Update: I checked connector and found a section of a wire in the harness fully exposed touching the block right by the connector for the sensor. It seemed alright otherwise though and didn't need to be spliced so I just put liquid electric tape on it. Seems to have fixed it so far so hopefully that solves my issues. Thanks for the help Dan I appreciate it.

@ScannerDanner 4 года назад

It's Paul Danner but that's okay, I get "Dan" all the time. Nice job on the detective work!!

@swinnysobsessions477 8 лет назад

What do you think of the snap on diagnosis units?

@ScannerDanner 8 лет назад

+THE SWINNY awesome!

@thexflexclan 6 лет назад

In my car when i start the car in the cold and put the scanner right away recibe signal from both o2sensors like from open loop changes to closed loop in 20 seconds after turn the car ? Whats that really mean and plus both of them read so hight yesterday i saw something weird 1 sensor stuck on number 1.246 v for a while ?

@ScannerDanner 6 лет назад

do you mean something like this?ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-v8XrM-7BuOg.html

@thexflexclan 6 лет назад

ScannerDanner yeah pretty much but today i notice that the car it takes a long to start like cranks for almost 6 seconds and sometimes it cranks right away and also i noticed black smoke coming out from the tailpipe the spark plugs are new one i replace it 2 months ago it it seems like something wrong with the fuel system

@thexflexclan 6 лет назад

ScannerDanner i check the fuel injector to see if they make the cliking noise they seem to working fine but i gonna need to check the fuel pressure and check the fuel pressure regulator disconnect the vacuum house and remove the Spark plugs to see if they smell like fuel probably could be a leak injector that is leaking into the cylinder when start the car it feels so weak poor acceleration

@929rrdan 6 лет назад

Could u do a video more covering the down stream vids or do u have one I didn't see it if u did

@ScannerDanner 6 лет назад

sure, what exactly are you looking for? There really is no difference when it comes to testing for function other than the delay of mixture changes from the cat. If you're looking for how to test a cat. I have videos on that. Here is one. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vyVnhCIMDnw.html

@929rrdan 6 лет назад

ScannerDanner watching ur videos has answered my questions... I'm new to the scanner world. I've monitored my sensors my b1s2 is reading low but does follow my b1s1 so I'm thinking cats bad I'm going to take out the b1s1 and do the pressure test.. I'm thinking it's not plugged it's empty sounds hollow like a tin can when I tap on it. Weird thing is on my freeze frame data my ltft was 99.9%

@islamsh.4862 2 года назад

Should front o2s fluctuating even while driving and engine under loading?!

@ScannerDanner 2 года назад

as long as the throttle is being held steady, yes. Other than wide open throttle

@islamsh.4862 2 года назад

@@ScannerDanner thanks..my front O2S stay steady rich (0.850 v) while accelerating (rpm about 3000) is that normal? I have p2191 code.

@ScannerDanner 2 года назад

@@islamsh.4862 heavy accel and wide open throttle, yes what is the definition of the code you have?

@islamsh.4862 2 года назад

@@ScannerDanner actually i have 3 codes…p2191(system too lean at higher load),p2096( post catalyst fuel trim system too lean)and p2187(system too lean at idle)..2007 sonata 2.4L

@ScannerDanner 2 года назад

@@islamsh.4862 what are your fuel trim numbers? At idle and at 2500 rpm in park?

@monirobaid5809 4 года назад

hi, I'm on the process of changing the two front oxygen sensors on my 2003 E500 and I need your opinion regarding some info I've found online, i've copied it and I'll post it below here it is [ Replacing a failed oxygen sensor may be all that you need to do, but be aware that older catalytic converters may not play well with them. Likewise, when you change out your catalytic converter, you'll need to change out your O2 sensors.May 18, 2016]

@ScannerDanner 4 года назад

why are you changing both front O2 sensors?

@monirobaid5809 4 года назад

@@ScannerDanner Ok I'm gonna say a little story about this vehicle hoping that you can help me with this DIY, I've parked the car for about two and half years do to excessive battery drain, before i stopped driving it I've replaced the following, both fuel pump units ( genuine Mercedes parts) new Bosch spark plugs, I've flushed the engine coolant twice at the same time using Mercedes antifreeze, twice brake system flush using Mercedes brake fluid, new front and rear brake pads and rotors, and now after it was setting for that long I wanted to address that issue which is the issue of battery drain. I started with the alternator I removed it and took it to the alternator rebuilder shop they told me that it's good except it need a voltage regulator which I was already ordered and I did replace both batteries the main and the auxiliary I bought them from the dealer so I put everything on the car and started the engine so i can go deeper with the diagnostic regarding the battery drain but unfortunately, the engine lights came on I used my Obd2 scanner I had cylinder 1 and 2 misfiring and the engine was shaking hard, I identified the issue by disconnect the connector off each coil one by one and there was no changes in the engine then I swapped coil 2 with 6 and 3 with 7 i did the same process and noticed the difference + the misfire codes transferred to 5 and 6 cylinders so I did replace the coils and the problem was solved, 2days later the engine lights came on black smoke from the tailpipe, I scanned the car and there was a misfiring codes, I will copy them from my OBD2 Scanner as the same way as they are, here it is. P2051 MIL ON&Stored&Current Misfiring Of Cylinder 1 , damages TWC (P0301) P2050 MIL ON&Stored Misfiring , damages TWC (P0300) so i was suspecting on the fuel injectors since the car wasn't driven for a long time but what confused me is when I performed the big screwdriver test and listened to the ticking noise but they all acting the same Which made me suspect on the oxygen sensors.. I know I've been writing a lot and I hope you have time to read

@ScannerDanner 4 года назад

Are you running 2.5 year old gasoline in this thing while you're trying to troubleshoot a misfire?

@monirobaid5809 4 года назад

@@ScannerDanner no, fresh premium fuel with fuel injectors cleaner added to

@nicorallysport 6 лет назад

👍 Hello. should we have the same oscillation with lambda probe (upstream) and lambda probe (downstream)? thank you in advance

@ScannerDanner 6 лет назад

Not if that cat is doing it's job. Also, they don't use wideband sensors for downstream O2s

@nicorallysport 6 лет назад

the car of the decatalyser (dé-chat) is perhaps for that? Thank you for your help

@nicorallysport 6 лет назад

even de-cat the car to was reprogrammed to have a good ratio air / fuel. In a test with launch creader crp129 premium the bank sensor B1S1 gives an afr from 0.99 to 1.07 at idle, and a current of -0.04 a + 0.04mA so close to 0.00mA for a good ratio! ?. the bank sensor B1S2 that gives me a lambda of 0.97 to 1.1 oscillates from 0.2 to 0.9v still idling and lambda probe at 350 ° Celsius (probably from de-cat). thanking you in advance for your help

@nicorallysport 6 лет назад

I specify I am in lambda probe narrowband I think!

@macknumber9 9 месяцев назад

I have a cheap $100 scan tool ..does it refresh fast enough to do a side by side on this data? Or do i need a better scanner to really see if an o2 is lazy or not

@evanwynne5293 9 месяцев назад

Switching time on an O2 sensor is 200ms peak to peak so a basic scope should be enough to tell if it is responding slow

@macknumber9 9 месяцев назад

@evanwynne5293 I don't have a scope...only a scan tool innova 5210

@macknumber9 9 месяцев назад

@evanwynne5293 also out of curiosity I can see how to test upstream o2 sensors...nice testing those because there is nothing in front of it except the combustion that occurs....with downstream you have the catalytic converter in front of it and it can get tricky...can you still do the snap throttle tests for downstream o2s or do you need to feed the engine propane? My understanding is a bad cat will never register rich it will only register lean as it isn't doing its job of converting gases....so can I just feed engine propane and look for it to be rich? The upstream to me is easy like I said because there's no cat getting in the way of things...what are some methods you like to do to test between a bad downstream and a bad cat? For example diagnosing a p2096 (post catalyst fuel trim too lean)

@ScannerDanner 9 месяцев назад

Refresh rate is not only affected by what scan tool you're using. It is also the system and whether you're using OBD2 or OEM. Lots a variables. Also with OBD2 systems if the signal is slow to change, you'll get a code for it

@evanwynne5293 9 месяцев назад

@macknumber9 you can send it rich by driving full acceleration or send it lean by letting off the throttle and letting it go into fuel overrun rear O2 sensor should go lean as well. Most of the time that I have seen p0420 the rear sensor copied the swing of the front sensor which would indicate the cat isn't doing its job. You could also test the emissions with a gas analyser.

@fuckjewtube69 8 лет назад

Hey where do I find this book of yours? I want to buy it.

@ScannerDanner 8 лет назад

+rsx123 www.scannerdanner.com Thanks!

@alexpacheco2031 6 лет назад

wow they let you take a scan tool from school

@ScannerDanner 6 лет назад

yes they do

@ezhiksobolevskii432 2 года назад

💎💎💎💎💎

@bellakaram8132 4 года назад

In a Nissan Sentra 2004 I had to replaced 02 sensor ( the code P1279 show 1 bank 1 air fuel sensor was greater than the maximum allowabe limit) the RPM were find (before) I replaced the 02 sensor. Now I can start up the engine just find when engine is cooled. But when the engine is warms up the RPM drops and when I need to restart the engine the RPM will drop to 0 and engine turn off. I get the same code P1279, I went and changed the PCV vale and still the engine will start the first time and when I truned it off and to restart the engine it has the power but the RPM drop to 0 and engine turns off. I have to push the gas pedal 3 to 4 time to get the RPM up. Please help...

@ScannerDanner 4 года назад

Are you getting any lean codes? P0171, P0174? MAF sensor and air intake leaks after the MAF and vacuum leaks are all mentioned in the P1279 flow chart

@joelopez40oz23 8 лет назад

what was the reason for both rear O2 sensors showing so much actiity as if both catalityc converters were bad?

@fuckjewtube69 8 лет назад

+JoeLopez40oz rear O2 sensors arent supposed to show a lot of activity. Theyre supposed to be stable.

@ScannerDanner 8 лет назад

+JoeLopez40oz possibly, or I didn't run it long enough for them to heat up.

@mauriceupton1474 6 лет назад

Confusing.

@ScannerDanner 6 лет назад

watch some more of my videos or ask me a question, I'll try to answer it.

@mauriceupton1474 6 лет назад

ScannerDanner thanks for that, I have just changed an oxygen sensor my car and have monitored it on the OBD2 hand tool, it fluctuates up and down 0.2 to 0.8 mV as you would expect, but the car has developed a new issue, it misfires after cold starting, it ran well when I first replaced O2 sensor, then it developed a misfire sounds like it's running on 5 out of 6 cylinders, not sure if it's related to the new O2 sensor. My question is what does the graph of a normal running oxygen sensor look like under normal operationing, idle, start and driving conditions. It runs at idle ok, 0.8mV for 3 sec then down to 0.2 mV for 1 sec then back up to 0.8mV but when driving around is all over the place. It does not have a catalytic convertor or down stream O2.

@ScannerDanner 6 лет назад

If you have a misfire the O2 will certainly be affected by that. If it is a cold engine only misfire, check it for a vacuum leak. Like in this video. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-h8rxpfRvHf8.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-3RFTS22w6tM.html

@mauriceupton1474 6 лет назад

ScannerDanner Mate, you are so good, thanks, had a vacuum leak in my other Ford AU2, now it runs like a new car.found it using brake cleaner, could hear it but had to use the spray. The BA runs like a chaff cutter when cold, but its intermittent, thats the problem

@mk-sl3nn 5 лет назад

Thanks great video,I'm having bad gas mileage I have a video I post right here on you tube ,its under(2004 nissan quest oxygen sensor and fuel trim reading)can you please check it out and comment and let me know what you think of it,you know yr stuff .Thank you

@LynxStarAuto 8 лет назад

Nissan/knock sensor code/😒😒😒

@ScannerDanner 8 лет назад

+Lynx Star Automotive (Gabe V) It's coming

@SteveRobReviews 8 лет назад

I thinking there's a lot of DYS'ers out there that buy the high end snap on scan tools , I guess like any other hobby if you have the means and want the best go for it. Can't take it with ya. HaHa.

@geirtoresimonsen8729 8 лет назад

+Steve Rob I've probably spent almost as much on tools as my cars are worth over the last few years, but unlike the cars the tools will eventually pay for themselves. And it is very satisfying being able to fix things, especially after learning so much from this channel.

@SteveRobReviews 8 лет назад

+Geir Tore Simonsen Glad to hear that, it's only a hunch but I think some us are quite well stocked for tools and in my situation I have friends that are techs at dealerships and I have more tools than they do. I have one friend that has been in the trade for 15 years and didn't know what an oscilloscope did until I got him watching Pauls channels. Best investment he ever made in training he tells me. Take Care Steve