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HOW TO KNOW IF OXYGEN SENSOR IS BAD TEST OXYGEN SENSOR

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HOW TO KNOW IF OXYGEN SENSOR IS BAD TEST OXYGEN SENSOR
If you have engine light due to oxygen sensor we will explain how to test oxygen sensor and know for sure if your oxygen sensor is good or bad. We will explain how to know if upstream oxygen sensor is bad and how to know if downstream oxygen sensor is bad as well. Upstream and downstream oxygen sensors are different and the test will differ. If your oxygen sensor is bad you can experience higher fuel consumption and your car not running as smooth as it should.
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20 авг 2024

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Комментарии : 212

@AutoRepairGuys 5 лет назад

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@bocho437 4 года назад

When the scanner says, Closed loop bank 2, that means the two sensors are bad on bank 2?

@poohbearvlogs6455 4 года назад

My bank 1 sensor 1 is showing 2.2 volts. Is it bad?. 2016 Nissan Altima

@Nelval573 3 года назад

Will black smoke be caused for this

@Nelval573 3 года назад

#autorepairguys

@djcrule 3 года назад

Why can’t I see readings for bank 1 sensor 1 or bank 2 sensor 1 I can only see the b1s2 and b2s2 I have a Foxwell nt680pro I’m using it on a 09 Acura MDX.

@victorwalter5323 11 месяцев назад

I searched through about 50 videos and you know how time-consuming that can be with all the commercials, until I found this guy who actually showed me what a bad O2 sensor looks like on an OBD2 scanner. Thank you!

@mikenaples4046 4 года назад

He is number one mechanic in all of Kazakhstan.

@roachmotel69 4 года назад

😆💩

@mikeydmuzikofficial8819 3 года назад

🤣🤣🤣🤣

@twozonestillpayday 3 года назад

He is noiiice .

@kingphillieman 3 года назад

Underrated.

@mgoody8782 3 года назад

Really a pain in the hanoose

@alanedwards6285 4 года назад

Superbly explained, straight to the point saving a lot of time and hassle. And solving my problem. Thanks buddy!

@notmenotme614 3 года назад

The Sensor 1's are what's called a PID feedback circuit, which means it hunts above and below what it wants... the figures are undershooting and therefore it adds fuel, then it overshoots and backs the fuel off, causing it to undershoot again, causing it to add more fuel again, as it oveshoots it reduces the fuel again, repeat. Basically the feedback loop reacts too much and it keeps on adjusting, going above and below what it wants. I imagine a house central heating system to help me understand.... When the room is cold, the heating turns on, heating the room up but when the temperature overshoots the thermostats set amount, the heater switches off until the room temperature falls back down again. Another example of a PID feedback system is a cars cruise control that's set to 100kph as it drives up and down hills, as it goes uphill the cruise control throttles up to keep at 100kph, as the car goes downhill it backs off to stop it going over 100kph. In this video Bank 1 Sensor 1 is working as its hunting,...fully adjusting back and forth. Bank 2 Sensor 2 is dead, its not reacting at all and flat lines no matter what the engine is doing.

@johnharbour3158 Год назад

How do u differentiate what he shows vs a problem in O2 wiring? Thanks

@willthecardude6900 2 года назад

"start your car outside, never start it inside" *proceeds to start car inside garage* lol

@rytoniowendolini2793 2 года назад

Good humor. Bought the 7 piece socket o2 set. Only 1 fits the sensor, and I can't get leverage where its at. Won't budge. Sprayed penetrating oil, etc. Only thing I can think of is a very deep well socket to get me up and above some where I have some room to work. Will add an extension bar to the wrench too. That rear cyl 4-6 socket is in a hellish position. LOVE IT! Probably like this to force me to take it in somewhere.............

@raultrevino9642 4 года назад

Loved it Great very clear explanation well done... with lots of patience. Keep it up the great videos.

@wing4382 4 года назад

Rev up your....Oh Wrong Channel

@plumbc007 4 года назад

Lol scotty is over there m8 lol

@lukeh7854 4 года назад

I thought exactly the same :-))

@Frankie431 4 года назад

Hahahahaha

@johngreen7546 4 года назад

That's funny lol

@Chrislav7 3 года назад

Lmao

@brianmcnary9997 2 года назад

I just wanted to say thank you for your videos. They have saved me time and money. I just ordered an upstream O2 sensor for my Elantra bcuz it is idling rough and the mileage is dropping. At 172,000 miles, I will simply replace it. Thanks for the testing video as well as the "how to" replace it video.

@davidborch213 3 года назад

great video, one of the best I have come across, straight to the point and no long talking, thanks learn a lot

@timguy161 Год назад

Thanks for the video. I hope you can show a lazy O2 sensor scan waves. I used a $10 Bluetooth OBDII scanner to test. Another RU-vid video indicated that pumping brake pedal will release vacuum via the brake booster vacuum line, thus inducing a response in scan waves. My XG350 2004 (idle smoothly) showed rather active up and down waves for Bank 1's and Bank 2's S1 sensors (responsible for short-term air/fuel mix adjustment). They responded to my brake pedal pumping (3 or 4 times) (car in garage, not moving) after a very short delay (less than a second perhaps) to show a large peak. The same behaviors were seen in XG's OBDII short-term fuel trim curves. The peak disappeared after a few seconds. My Saturn Vue 2007 V6 (with Honda Pilot engine) (having rough idle problem) did not show S1 sensors in OBDII. I checked Vue's STFT curves instead. Same large peak response to brake pedal pumping. However, the waves without braking were only occasional and far less frequent than my XG's. I guess that means I have lazy S1 sensors causing rough idling. I will replace S1 sensors to see whether rough idling will improve.

@Withinlimits 8 месяцев назад

Did it fix your idling issue

@mikeleeslifehacks 2 года назад

Thank you so much for this video! I've been getting a hesitation at low rpm idle and couldn't figure it out! No codes to read. Once I plugged in my obd II dtc tool and went to live data and watched all my o2 sensors in action. I was able to determine that B2S2 (downstream) was falling well below the acceptable range. I ordered a new oem sensory and will be installing it tomorrow. I will keep you updated if this fixed my problem! Probably saved my hundreds of dollars 💸. I had an appointment set for Jan 4th but will cancel now.

@SI29222 2 года назад

Any update?

@mikeleeslifehacks 2 года назад

Update: indeed the O2 sensor needed to be replaced and that part was easily diagnosed and fixed. However, I'm still getting a slight hesitation and idle when I'n drive

@dugy40 9 месяцев назад

I have this scanner. Great for those that can’t afford a pro one. I own a Topdon Phoenix lite 2 also. The catalytic converter is over one thousand degrees. Not one hundred degrees as you said. Great video though.

@WV591 5 лет назад

Are my eyes and ears and you tube must deceiving me? How can this be? an Honest and helpful Russian mechanic. what is the world coming to. TU comrade

@hankbridges5055 4 года назад

WV591 He's French.

@WV591 4 года назад

@@hankbridges5055 no way that's a rusky if i ever heard one.

@Dan007UT 4 года назад

What if my sensor is reading 0.01V at idle for a long period of time and doesn't go up a down unless I give it throttle

@zlabfab487 3 года назад

@Jake Blakeman post cat - downstream. Im trying to get catalytic monitor and 02 system ready but my o2 sensor 1 bank 2 is at .105 volts ( at idle and engine full warmed up)

@carsrcool7149 3 года назад

In Kazakhstan we have a problem....prob-lem is the goo !

@humbledhands Год назад

Hello great video! According to my scan tool my 2000 Toyota Camry 2.2 l 4 cylinder bank 1 sensor 1 upstream shows I have over three volts when warmed up! Would that .ean I have a short maybe or bad sensor. Any advice would be appreciated. Thank you

@theolufson 27 дней назад

My 2001 Tacoma does too! I think that’s normal for those early Toyotas if we’re both seeing it. Mine was showing that long before P0420 problems.

@aacar4095 2 года назад

Great video as usual. Is there a time where the oxygen sensor is just a little off and needs to be be replaced, or is it usually "it works or it doesn't"?

@ninetails5862 4 года назад

What if at idle my downstream sensor moves like it should but never gets above .5 volts

@tilemarblegranite 4 месяца назад

Dodge Ram 1500 4.7. O2 Bank 2 shows low voltage on idle. My understanding is the O2 Bank 2 should read high voltage on or above 0.45 to 0.85. Low voltage is lean condition, could there be an exhaust leak? Thank you!

@mAKtre47 Год назад

I have a 2003 toyota camry sensor 2 fluctuates and then drops to zero at times while driving... the car is running fine but throwing a p0420 code for the cat... trying to check all options before going for the cat

@NURsMec 2 года назад

Hi have a question. What if the catalytic converters has the one problem. Does graphics moves up and down still?

@racdude01 Год назад

Probably too late on this comment but in case someone else has the same question. If the catalytic converter is bad the downstream sensor will not stay around the 0.7 mark like in the video but instead rapidly change up and down much like the upstream sensor does

@christopherortiz8713 Год назад

Thank you for video. 4 cylinder Honda Accord. On scanner the O2B1S1 is giving a reading of “n/a” .. so it’s bad correct? The O2B1S2 give a between .4. -.6. Any suggestions

@sptvids Год назад

Well explained video. I have a question though. Its about the faulty Sensor 2 post cat sensor that showed 1.270v. Is that voltage from the ECU? I have a GM corsa with a bank 1 sensor 2 P0138 & P0140. It shows in live readings as 1.275v constant, even when the engine is cold and off, with the ignition on?

@luisdaniel75 6 месяцев назад

same here, did you find out the problem?

@sptvids 6 месяцев назад

@@luisdaniel75 Yes, it was the O2 sensor. I just bought one and replaced it myself. All sorted. The 1.270v showing on the diagnostic really confused me. I think it is an ECU reference voltage

@mcp08gt 2 года назад

Im getting a code p0420 on my 02 sequoia but i hooked up my scan tool and all sensors are reading fine. Im lost.

@Ash-np4to 2 года назад

Yup. Getting p0420 and p0136. Prius. Sucks ass. My b1s1 says n/a

@manup2008 4 года назад

Great video mate! Is it the same for both upstream and downstream sensors?

@jdm_obsession 3 года назад

He answered that in the vedio

@raul.oliveira 7 месяцев назад

What about when the Sensor 2 ( downstream) hovers between 0.2 and 0.8? Does that mean the CAT is faulty and not the sensor, right?

@shark70007000 2 года назад

What about driving downstream reading. My son's Toyota is reading 0.000 and bounces to the highest, 0.035. But mostly at 0.000 while driving 55 to 60 MPH. The upflow is up and down like what you were showing. I just cleaned his cat, as it was getting clogged up a bit. It was giving him a code that the cat was going out. He keeps getting the evap system code too. Changed everything but the evap canister. I ised the dish soap method to clean out his cat, and it seems to have worked. I didn't check what the readings were before cleaning it out. The light shows it cleaned out a good amount. Couldn't see light through it before. See pots of light through it now.

@rohanbhoir5779 2 года назад

Hey i have cng car, and its mileage is dropped so much, total 62,000 km running done. All routine maintainance work done on schedule with best branded oil and filters. But i m not able to find reason behind mileage drop, can u suggest something?

@jasond4752 Месяц назад

My upstream sensor shows no data at all on my scanner. Does that mean the o2 sensor is bad or a wiring issue?

@crewtheaftermath4105 2 года назад

Hi, Great stuff. You know your stuff. Question. I am getting O2 codes on 2000 ML430, My symptons are NO start when truck is warm. I did cde check got O2 sen0r BANK2. I am going to order in a couple of weeks. But want to be sure this will fix my no start. ( thought it was immobiliser but found the no start was only when warm)

@brettm2151 Год назад

My B1-S1 voltage is usually around 5V

@donbest8981 2 года назад

What if you have a 2013 nissan rogue, with a p0171 code? My Bank 1 Sensor 1 is reading at 2.250V. I've tried going through everything on this vehicle. At first it wouldn't start back up even after shutting it off for just 5 mins.

@burnyknob9502 4 года назад

my trucks in open loop , the previous owner said that the downstream sensor was deleted. i got to looking and theres 4 sensors but 2 are plugged into the catylitic converters. why would it be in open loop and why would he say their dleted?

@deere3321 4 года назад

Thanks. Helped me out a lot.

@user-zr3bv6vm5q 3 года назад

Hello. I have lexus ls 300 2004. I opened O2 dowenstream p0430 and cleaned. After i returned back, but sensor does not work. Showing 0 voltage. But before open voltage was 0.6 Means Good. I dont know What happend.

@user-zr3bv6vm5q 3 года назад

When car is cold the sensor is working, but when be Hot voltage become 0.

@chernass 2 года назад

hi can you have a bad oxygen sensor without having fault in the diagnostic? thanks for all videos

@chrisjfox8715 11 месяцев назад

It can show signs of being on its way out yet not quite be there well enough to trigger codes yet

@Tommy-lr1si 3 года назад

What is that red and white band your wearing on your left wrist?

@ziadajam5433 Год назад

So I have a diesel and my engine coolant temperature doesn’t seem to go over 160F/ 72c and in diesels since the fuel combusts from the high compression and cylinder heat I may be experiencing an issue where I’m having some unburnt fuel deposit into my exhaust. My bank 1 sensor 1 and sensor 2 both seem stable at around 0.8 v but when I give it gas they spike, does that mean my o2 sensors are probably good but im having issues with engine temps burning fuel? I also noticed a slight drop in fuel economy possibly due to engine not able to warm up all the way due to a bad thermostat

@frikyouall Год назад

Very helpful if your car has OBDII. Mine does not.

@racdude01 Год назад

Your car must be older than 1996 then

@frikyouall Год назад

@@racdude01 Correct. 1994. Had to buy an OBDI to scan it, but it has all the OBDII information, so worth it, I guess.

@todddann3134 2 года назад

What does it mean if there is a flat drop 0 volts in voltage for o2 sensor 1 anywhere from a split second to 8 seconds? Also, what about brief spikes in short term fuel trim (98, 85) but no corresponding o2 sensor voltage spike?

@dbbias1416 Год назад

Great video, Thank you 👍💯

@Alex-yb8xw 4 года назад

I got this scanner to be able to graph the 02 sensor voltage and keep losing communication any suggestions? I did run the car before the test and I’m able to see the DTC but I lose communication out of nowhere any help is appreciated

@syedmujtaba4162 3 года назад

Do reply on this comment after 10 days so that I come back and give a review on a scanner by the name Carpm (Bluetooth). It’s cheap but as of what I heard, TOADpro is the best if price is an issue. If price isn’t, go for Launch x431.

@Eddythe_Eagle 3 года назад

Hi There. Just subscribed to your channel. I have a 2010 elantra 4 door sedan GL . No check engine light. Rough Idle. I have a launch 123i scan tool. The upstream 0 2 sensor is reading 2.0 volts and the downstream sensor is reading 0.74 vots ( Rich) The STFT reads - 0.78 Volts and the LTFT reads +1.56% . Car drives OK, but fuel economy is terrible. I have cleaned the MAF and IAC, and Throttle body. Any ideas. Thanks

@joselegaspi7486 Год назад

Hi how r u . Have a 2004 e320 wagon I broke the handle of the cover that cover my third seat and reserve or spare tires .How can I fix that problem. Thanks

@riflebear1711 2 месяца назад

You need a mic bud. Mandatory

@kelbymorgan 11 месяцев назад

With my scanner, sensor 1 is In milliamperes. Do you know what a good range is for sensor (upstream) 1 In milliamperes?

@JuanFlores-rj1he 2 года назад

Thanks!!

@userman444 5 лет назад

Why you switch from Foxwell 630 to Creader launch? Better scanner?

@mmafighter6355 Год назад

B1 s1 keeps reading max on my TT 1.999 is that a bad pre cat sensor?

@alvinlawanto 3 года назад

Hello my car is toyota vios 2004. I have obd2. Can you tell me the normal range of every sensor on my car? Thank you..

@dgee2684 3 года назад

The scanner is only £56 on amazon. Does it do mitsubishi Outlander 2005?

@_________________7791 5 лет назад

You also have bad o2 sensor that doesnt react to air leaks, or rich condition. it stays at a fixed value at idle.

@wazzabanzook5028 2 года назад

what a out the oxygen sensor current? my scanner doesn't show the voltage for o2 B1S1 only shows current which is around 0.02mA. is this ok?

@richarddiaz8248 Год назад

Darn you a a good mechanic

@jianchen690 Год назад

Hi: my car oxygen sensor replaced, do the smoke inspection. now no fault code, does the car have to run for 200 mi before going to the smoke inspection?

@Omar-on804 4 года назад

if the reading on the scanner for O2 B1S1 is "NA" , what does that mean?

@qwert62107 4 года назад

Not available? Maybe not Working?

@Crnigruja Год назад

I have one question, I have mazda 6 2008 1.8 petrol and when accelerate it's jerking and choke like thing, staling until 3-4000 rpm. No check engine light and when use scan tool it's says some strange thing. First even temperature is like 91C says that is Open loop inficuent temerature, there is no senson 2 or downstream, for sensor 1 voltage is constant high, constant low sometimes it's oscilating. Short term fuel is stuck on 0 and curent in mA of sensor 1 is constant 6.35mA. Is that sigh tnat is sensor bad, folowing your video I think it is but I am not mechanic. On local mechanik shops they are unable to resolve problem without telling me they need to replace MAF, spark plugs, acc sensor and eletronic motor and that is too expensiv.

@magicone9327 10 месяцев назад

Any chance it’s the pcm?

@susiesoto3436 2 года назад

Hello...ive seen a video were they tested the o2 sensors by pumping the brakes and watching the graph move up and down? Which test is more accurate?? Thx

@tapiwarwizi8461 Год назад

Brakes? Please show link

@RC-Heli835 3 года назад

I was thinking it's a good idea to check for correct signal, ground and 12v positive. Or whatever the system uses before buying an 02 sensor.

@evelynintrance 2 года назад

my upstream sensor shows between -0.20 to 0.01... this doesnt seem ok and the car takes lots of gas.. is this also a bad sensor? or a different problem

@arthurgarcia4389 2 года назад

Why is the bad sensor so high? My truck has the sensor two stuck at .750 Could that be why i have loss of power, wont go over 40mph, rpm revv up and drop but truck never accelerates.

@marcomedina7528 3 года назад

Can a vacuum leak cause a false reading on the live date screen? Or is there anything that can give a false reading?

@carlosrincon5525 3 года назад

What if I have no cats lol?

@CHIBA280CRV 4 года назад

How can you tell that it’s not a wiring issue ? Coincidentally they are both bad ? That sounds like a good guess if your correct on the call.

@Neko6000 Год назад

I have a wild question. Is there a story behind the "Yellow Mat with Bigfoot Print" on the floor close to wall? time stamp 1:13

@julsmikaniko-davao4615 2 года назад

Sir..good day.. if the minimum output voltage of sensor down to 0.000 v,it is fine??

@danreed4521 2 года назад

Nice job! Big help

@hankbridges5055 4 года назад

A Actron CP9680 can test oxygen sensors. EBAY has it.

@senao8090 3 года назад

May I know if you encountered a fault code in your scanner?

@jk-bf4nw 4 года назад

My upstream sensor works well at low rpm but when increase above 3500 rpm the voltage is high and the check engine light appears. I have p032 code. The sensor is bad?

@carljohnson4996 3 года назад

My bank 1 sensor 2 is reading 0.1 and doesn’t fluctuate is that bad?

@stavrique 3 года назад

СПАСИБО

@Outlawz1971 3 года назад

Did the 02 sensor FEET?

@alanchanthavisouk8557 2 года назад

What if upstream and downstream graph shows the same? Does that mean the catalytic converter needs replacement or upstream needs replacement? Which one?

@susiesoto3436 2 года назад

I got the same thing..both up and down show flat lines!!

@tamingguppies Год назад

Upstream up and down Downstream flat line

@elijahnanaoseiameyaw9819 2 года назад

My Hyundai Elantra o2 sensor bank 1 sensor 1 reads static -0.20v is it normal or a damaged sensor?

@crosslofttipplerspigeons8227 3 года назад

It means one thing, you unplugged the sensor

@ricky-sanchez Год назад

😂

@canberksenolsun 2 года назад

this video is 44 GPM (guys per minute)

@Rajputvasu20993 4 года назад

What if readings are same as you but no check engine light? My car has 2 sensors i.e. upstream and downstream Upstream graphic is up and down not less than 0.7 not more than 1.0 volts Downstream graphic is stable to 1.27 volts even after acceleration. BUT NO CHECK LIGHT. PLEASE HELP ENGINE IS HALTING ROUGH IDLE HIGHER FUEL CONSUMPTION

@Randomguy-kn3nv 4 года назад

I mean maybe I’m dumb but didn’t he say if the sensor doesn’t move or fluctuate at Alll then it’s a bad sensor.... and u say it’s stable as in its not moving at all?

@lovedreamfastener 4 года назад

Question, my 2001 Toyota Sequoia that have all o2 sensors showing 0 volt during idle but it goes up to random voltages (with upstream higher the downstream) when i rev up to 25k rpm and hold it there and they just take turns to go up and down between 0~0.8 volt. Please help, thank you!!

@stevek343 4 года назад

No help i guess?

@rahrah8076 4 года назад

What codes do you have ?

@dazzlingblue2154 3 года назад

is cleaning the o2 can do something?

@crystrezerex2life Год назад

My downstream sensor drops to 0.24 and back up to 0.65 and back again....is that a bad thing?

@kevindeandrade8201 4 года назад

Hi guys grettings from Venezuela. I had a f150 4.6 v8 engine. Its make me crazy. Y got 5 codes. All are similar B1s1 stuk rich b2s2 stuk rich. Bank 1 rich etc. I scanned and de output voltaje from tje both o2 sensors its about 0.912v and 1.100 they doesn move over there. And the graffic its a flat line. Should i buy both o2 sensors? Another test? Thanks my friends

@ricky-sanchez Год назад

What ended up being the problem?

@-jimmyjames 4 года назад

str8 to the point

@juicethepimp 7 месяцев назад

“Don’t Rev it up” *Revs it up

@thegoatsofforex2914 2 года назад

Can a bad oxygen sensor causes EPC light?

@mohammadshabir643 2 года назад

What if I don't have a check engine light on?

@ByCats4Cats 11 месяцев назад

So why would my mechanic charge me for 2 hours of diagnostic time to find the bad sensor when this video was under 10 minutes?

@majidmahmoudi5725 2 года назад

Thanks you please test sensor oxygen 206 tu3 a

@1993saif1 4 года назад

my friend i have a 2013 mustang v 6 i got the code for bank1 and bank 2 efficient threshold catalyst my car got something when hit full throttle the car rpm go from some 1000 to 2000 rpm so slow the car launch is so bad and when keep doing full throttle its start to do something like misfiring its keep cutting of and keep lagging but i got no misfire code any advice note my cat is deleted

@samfonoti622 4 года назад

I have the same problem... It hits rough idle at 40mph and up... Did u figure that out yet?? Lmk pls...TY

@foxtrot789 2 года назад

There's something hilarious about a dude with a thick European accent doing an incredibly thorough diagnostic on a Jeep.

@ricky-sanchez Год назад

Jeep is Chrysler, Chrysler was and in many ways still Mercedes. The car in this video looks a lot like an ml320 with a dodge grill on it.

@bryantoth5249 3 года назад

Hello, can you explain why the voltage jumps around so much?Constantly going from lean to rich. I would think in a good engine you wouldn't do this. Thanks.