O2 Sensors is it Upstream or Downstream?

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In this video, 1A Auto shows you how to identify an upstream or downstream oxygen (O2) sensor
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While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

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11 май 2017

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Комментарии : 334

@1AAuto 4 года назад

√ *Watch the Video* √ *Buy The Part at 1A Auto* 1aau.to/m/Visit-1AAuto √ *Do it Yourself* √ *Save Money*

@georgesimonsen8483 3 года назад

Buy them

@georgesimonsen8483 3 года назад

I'm done

@MrBangla11 3 года назад

Now what happens if u interchange the upstream to the downstream and the downstream to the upstream the actual sensors?

@Armageddon-qo4wy 3 года назад

What if you have a BMW 4 Cylinder with 2 cat converters and 4 sensors? 2 upstream and 2 at the rear of the cat converters? How do I know which is bank 1, sensor 1?

@kikibarrios1231 2 года назад

My 1997 F-150 was OBD scanned after my gas cap broke in half, and when I put in another one, same exact cap, except functional, I was driving with a bad one before and I got a check engine light. OBD said it was the O2 sensor, is the cap faulty, or sensor bad? Autozone told me the cap can cause that code to appear and I dunno now.0

@TRUNOS 2 месяца назад

This is one of the only videos I can find where someone actually explains upstream and downstream positioning and what they mean. Thank you

@josiahmoss3240 Год назад

Went and bought 2 O2 sensors; one of them cost a few bucks more ; when i got home and opened each box( different parts number) the sensors were exactly alike, only difference was the length of the wiring;

@yukiostrachan2048 2 года назад

Thank you for helping me understand that my 4 cylinder engine only has Bank 1. This video helped me immensely.

@davidharrell9902 3 года назад

This explains everything so simply. Thanks for your time and I look forward to your other videos

@user-xr1be1ok2d 8 месяцев назад

Good video little late watching this but just subscribed to your guys channel hope to see more amazing videos helped me out a ton as a young guy trying to become a mechanic one day very informative straight to the point but also very detailed great job keep making these videos !

@xgtmg 2 года назад

My upstream and downstream sensors have different connectors. I found out when the ones I bought off of eBay wouldn't plug in. The ad said upstream and downstream but I had two upstream sensors. Had to order some downstream sensors to finish the job.

@fernandogalvao6718 3 года назад

Excellent educational video. Thanks for explaining what banks are and which engines incorporate them.

@wtfsnotaken 2 года назад

I would have to agree I have a better understanding now of my VSC light and the bank codes

@alexchavez2550 3 года назад

Perfect video guys, saved my a headache before my repair tomorrow

@joearanda86 2 года назад

Thank you thank you for telling me what I needed to know I appreciate it and I love your videos

@shobud7561 Год назад

If the 02 sensors are different, how do you determine which one goes where ? Someone could have already put the incorrect one in the wrong place.

@jmo5592 2 года назад

Very great information thank you for the help👍🏼

@Dr2009king 4 года назад

That was simple and straight to the point.

@matmanpromotions6457 2 года назад

Thanks from down under. clear and concise tutorage.

@weeronnie100 4 года назад

Yep best and easiest to understand well done mate 👍

@millyonair9225 2 года назад

Excellent explanation! You're a GREAT communicator, bro!

@samuelmartinez1014 4 года назад

Thank you guys, this video is so good, keep it up!

@1AAuto 4 года назад

+Samuel Martinez Thanks for checking us out! 1AAuto.com

@Cougar1212 4 года назад

This doesn't answer MY question. Are the sensing heads different? There's only one "O2 sensor" for my silverado on every parts online store I look. Is it just wire lengths that vary? If the plugs reach their harness, can I use the same part for up or downstream? Thanks.

@sapoloc7115 4 года назад

Good description, thank you always very helpful.

@1AAuto 4 года назад

+Sapo loc Thanks for checking us out! 1AAuto.com

@KC-vp7wn 5 лет назад

You are the first person to tell you how to determine O2 banks. Though it now makes sense to me that the bank of cylinders with the number 1 cylinder will be bank one not everyone will make that connection in their heads. Thank you for spelling that out to us! Now I can go and change out my bad bank 1 sensor 2 O2 sensor and have the right one changed out!

@1AAuto 5 лет назад

+Kurt Cafini Thank you for the great reply. We love to empower our customers by showing you how-to perform your own auto repairs while installing our high quality auto parts. Have a great day! 1aauto.com

@Professionaltrenchdigger 2 года назад

Same! So happy 😊

@bigkev6784 5 лет назад

Man VERY excellent video & VERY informative. Thank ypu

@1AAuto 5 лет назад

+big kev Thanks for checking us out. 1aauto.com

@patriciawhite6429 2 года назад

how do you know which one needs to be replaced? i have a 1996 dodge 2500 van and its sluggish on take off and dies when i reverse onto an incline with just the back end raised up. that is the only time it dies out and i am able to restart without moving it. great video thank you

@dannypalmer7701 3 года назад

Nice explaining everything i been wanting to know!

@1AAuto 3 года назад

+Danny Palmer Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com: 1aau.to/m/Shop-1AAuto-c

@FSmithSE1 3 года назад

VERY HELPFUL VIDEO REGARDING ID OF UPSTREAM & DOWNSTREAM O2 SENSORS.

@1AAuto 3 года назад

+SPARTAN SMITH Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

@jello-va7622 4 года назад

Thanks very helpful

@mimusic1853 3 года назад

Right to the point. Thank you A++

@mmlindsey8635 5 лет назад

EXCELLENT..EXPLANATION ABOUT O2SENSOR 👍

@1AAuto 5 лет назад

+M&M LINDSEY Thanks for checking us out. 1aauto.com

@drosser8461 2 года назад

Excellent question which has caused much confusion - unfortunately, you spent the entire video clarifying a different issue. Okay, so I have purchased an upstream and a downstream sensor, taken them out of their boxes, then am called away for an urgent phone call. On return, I forget which came out of which box. How does your answer help? You have described the function of the sensors well - but your question was 'how can you tell the difference?'. It does not need a video to demonstrate their location on the vehicle. Surely there should be an identifying part number stamped on the body of the unit or a tab on the cable like any other part. Can you clarify how to identify the sensors without the questionable on car comparison (bearing in mind that aftermarket units may look different anyway0

@LA_Rider_ 2 года назад

if you are replacing the O2 Sensors, your OBD reader will tell you which one you need. Which bank, 1 or 2, if not both. O2 sensors last around 100k-150k miles max. Not a bad idea to replace both if one goes out. They usually run $20-$40 or OEM parts. Never use aftermarket for sensors. They often do not communicate with the vehicles ECM/PCM processor and you still get codes after you replace with aftermarket

@tagminda4565 2 года назад

Agree. It took the whole video just for location. 1 minute should be more than enough to tell which one is for such.

@AusTxBill 2 года назад

I have a different question.I have a 2006 Ford F150. I know from my dealer that the upstream and downstream oxygen sensors are two different part numbers. It shows part number 4L3Z-9G444-AA is the Exhaust Gas Oxygen sensor and part # XL3Z-9F472-AA is the HEGO Oxygen sensor. So I was looking to figure out which is upstream and which is downstream. I can't compare them to the ones on my pickup because a previous owner put in 4 of the same part number. I was hoping this video would tell me which one is upstream and which is downstream. Guess it's a trip back to the dealer.

@idahogreen2885 2 года назад

Oh fuck off nerd. Sticktoitivness counts. Dont blame the vid cuz you lost track

@idahogreen2885 2 года назад

Plus ones fatter than the other one, open yer eyes and shut yer mouth

@vegasjill21 4 года назад

Very helpful!! Thank you so much. 😉

@1AAuto 4 года назад

+vegasjill21 Thanks for checking us out! 1AAuto.com

@wisamabazly 5 лет назад

Best description ever..lots of great help.thank you ..best video.

@1AAuto 5 лет назад

+wisamabazly Thank you for the great reply. We love to empower our customers by showing you how-to perform your own auto repairs while installing our high quality auto parts. Have a great day! 1aauto.com

@fehronation8310 4 года назад

Thanks for the knowledge 👌🏽👌🏽

@1AAuto 4 года назад

+Fehro Nation Thanks for checking us out! 1AAuto.com

@uawsux 3 года назад

Upstream downstream Left Bank right Bank sensor 1 sensor 2 front and rear left or right up or down I'm glad this thing isn't in a circle you explain the easy stuff let's get to the front and rear on a transverse mounted engine

@QueBall5235 2 года назад

NOW this was helpful very detailed very specific information very helpful thank you 04 ford f150 fx4 5.4L v8

@brentcampbell3060 4 года назад

Hello....how many o2 sensors are on a Ford Taurus 2007? Thank you for your time.

@mikestevenson1318 3 года назад

Good video .Thanks !

@hayderali9385 2 года назад

Thanks for your video.. Is it possible to clean both sensor as maintenance and work performance better...???

@bekainjgia2910 2 года назад

Thanks for your explanation, it is very helpful, but is there differences for instance in upstream sensor driver side or passenger side?

@rogeliovmartinez 7 дней назад

thats why i love 1AAuto

@Sp_416 6 лет назад

Great video!

@Bfocus23 6 месяцев назад

Great value thanks

@bigad23 4 года назад

Thank you 🙏🏽

@redelrojas2098 2 года назад

Good job. I have a 2003 Hyundai Santa Fe V6 2.7L. Could you tell me where is Bank 2 - Sensor 2 and what are other names that it has?

@ceej5714 9 месяцев назад

Im having issues with ordering the right parts for a 2012 Dodge Journey RT AWD. Mopar website is not clear on which sensor goes to which bank. Could you help please?

@dilippatel3268 Год назад

excellent video

@Livinlivin836 3 года назад

Bought my o2 sensors from here they’re a great product !

@1AAuto 3 года назад

+Israel Reyes Thank you for your order! We'd love to hear about your experience. Here's a link to leave us a review on Google: goo.gl/i5JFNY

@Baked26 3 года назад

Look how clean that warehouse is, damn!

@adrianruiz4904 3 года назад

They obviously cleaned it leading up to the video

@ezye4567 2 года назад

Hi , my catalytic converter is stolen with upstream sensor then I installed straight pipe but the engine light is on and the fuel consumption is very bad . Does installing upstream sensors into straight pipe will solve the problem? Thank you

@lotus956 4 года назад

Turn your engine on. Locate catalytic convertor by touching the ballooned portion of exhaust. It should melt your hand off. It has two wires fore and aft of it.

@dannymcneal 3 года назад

Very helpful!! Thanks!

@1AAuto 3 года назад

+Danny McNeal Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

@JesseLockeHere2Do Год назад

Thank you!

@osomayor7083 4 года назад

help me please i dont know where is the sensor 1 and banck 1 on my nissan snetra 02 any body can tell me thancks

@corymollak2093 Год назад

You almost answered my question in fact when I think about it almost everyone almost answers my question. I got the different placements of the O2 sensors. My question is they're both installed just in the wrong based on electrical connection , but they both still plugged in(didn't force the connections just weren't notch out)do I have to worry about swapping them back. Ultimately, is there a fundamental design difference in each one...in other words is one specifically designed to catch the Upstream exhaust in one particularly designed catch the downstream or do they both function the same?

@RyanandSaraDelling 4 года назад

That is the cleanest looking '96 underbelly I've ever seen

@Sean-John 4 года назад

I was just thinking that 🤣

@johnoneill8842 3 года назад

Probably stared in a ton of other A1 Auto repair videos.

@time2maked0hnutz54 3 года назад

Camera tricks 😆

@mrequi1 3 года назад

No kidding, my 96 looks NOTHING like this

@clintzimmermann5838 2 года назад

There is no way that came from upstate NY

@skr3wb4llsr40 3 года назад

What if all 4 sensors look identical. I purchase new ones, both Up & Downstream and the new ones look like yours in the video, the old ones i took out are all identical. Any help with that?

@freddygarza6623 5 лет назад

If anyone can help I'm getting a code 0151 on my dashboard and I googled says bank 2 and section 1 . where can it be located?

@AJ2MONEYGANG 2 года назад

Good morning I have a question what is the difference between Jeep Liberty 2004 sensor like how to put it on or fix it

@kccodex8931 Год назад

Lose the music, it's pointless and distracting.

@malikking8953 2 года назад

Hey I have a 2007 Cadillac Escalade esv The check engine light came on in the cold was (P0050, P0154, P0155) Bank 2 sensor 1. I would like to know which sensor I have to get and if it upstream/downstreamI. Also please let me know which side of the truck is the sensor located. It would be nice if I can get a link for the sensor

@jayg1078 4 года назад

WOW! The best illustration of upstream and downstream and bank1 and bank2. Thank you, brother.

@1AAuto 4 года назад

+JAY G Thanks for the feedback and for watching!

@richardjohnson8840 6 лет назад

Is there a Video for 06 chysler 300 upstream o2 sensor

@HeavenReservation 2 месяца назад

thanks for the video, do you have a sensor 2 bank 2 for a 2019 Zo6 corvette?

@shiddy. Год назад

FYI ... I found out today that accidentally leaving one of the hoses on the intake near the air filter disconnected after changing the air filter will throw the exact code for this bank1 sensor2 O2 sensor failure my torque app said the light was on for 'o2 sensor slow to respond' ... instantly fixed by fixing the disconnected hose on the side of the intake tube if you have this code for bank1 sensor 2, first check all of the hoses that attach to the intake before digging into this O2 sensor repair - especially if you've recently had the air filter out if writing this helps at least one person it's worth it

@rodger603 Год назад

I'm seeing three O2 sensors on my 2007 Ford Focus. I don't know if there's one underneath the car yet but the third one from the motor they cut it and I'm guessing that one went bad in the former owner did not replace it. I'm having a check engine O2 sensor light coming on

@gbengaakindele1851 2 года назад

Hi, my car is a 1997 Toyota Camry with V6 engine (1mz-fe). I noticed some petrol leakage on the bank 2 cylinder. Meanwhile, the car is consuming gas more than expectation. I later realized that bank 2 oxygen sensor is bad and I replaced it. My question is that, while the bank 2 oxygen sensor was bad, could it be that the ECM is relying only on bank 1 oxygen sensor. Do both sensor have to send different signals to the ECM? Why is bank 1 not having similar problem? How do bank 1, bank 2 and the ECM work together?

@airon6864 3 года назад

I changed out my upstream o2 and cleaned my MAF with CRC spray. No engine light: I just figured it was about time. It restored so much power but I didn’t change the cheaper one. I’m assuming that’s the down stream o2. Do you think it would restore even more power? I’m at 179k miles on my Camry se 2.5l and I like to stay ahead of things. At the same time I was losing power and once o cleaned the MAF and changed the most expensive o2 sensor it made a huge difference. Just wanted to know if the other o2 sensor would be worth changing too even tho I don’t have a light on

@pepi8433 2 года назад

hmm, i have service engine soon

@viper8177 7 лет назад

On a flat four how do you know whether it is the upstream or downstream that needs replacing if the fault codes you are getting just say bank 1 because this could mean either? Do you have to buy both parts and see which fixes the problem or do many cars today have the same O2 sensor for both upstream and downstream so this wont be a problem to do the trial and error and not spend twice as much?

@1AAuto 7 лет назад

+ImperialJohn Thank you for checking us out. On the flat four, it will provide bank 1, and then sensor 1 or 2. If you receive sensor 1 this indicates the upstream, while sensor 2 means downstream. 1aauto.com

@ohioyodertoter6827 2 года назад

Well described 🙏👌

@Guilsfield_Cricket 2 года назад

Which sensor issue cause problems to the car? One Mechanic told me one of my O2 sensor needs a change and its fine to drive with it and the problem will only arise if the other sensor goes wrong. Which would it be?

@lcs1603 Месяц назад

Need a little help please. I have bought a new 02 sensor pre cat for my vauxhall insignia 1.8 petrol. Everything is the same apart from the end that goes into my manifold they're totally different. The old one is the same as yours on the right and the new one os the same as the one on your left (in pictures)

@tanveerplaha5506 5 лет назад

On my 2007 Mazda3, check engine light is on and after scanning I got a code saying bad air fuel ratio sensor. How'd you know if the upstream sensor needs to be replaced or downstream?

@liveandletlive2894 4 года назад

Upstream

@PeteBasel Год назад

I'm getting P0140 on an inline 4cyl is that the upstream or downstream sensor?

@r6blackandyellow 2 года назад

I'm working on my son's 2004 ford focus. I get a code bank 1 sensor "3". Is there a sensor 3 or wet does it say that?

@sammec2282 2 года назад

I have only 1 sensor in Kia cerato 2014, does that mean 1 sensor will work both upstream and downstream ? And why it shows I have 2 sensors in scanner when I have only 1 ? And the upstream works good but downstream stays still at 460v, pls help, thank you

@deanjagger1190 8 месяцев назад

I have a 2014 town and country van, low millage on the engine, 120,345 miles. I comp. says I have to replace the C C. Expensive job, so I was told it might just be the sensors. Is there for on my van, I might replace them all? 2 up stream, 2 down stream.

@ryanvergara3603 6 лет назад

Hi. I have a Honda Fit and my OBD scanner tells me that i have heater circuit malfunction in air fuel ration (A/F) Sensor (Sensor 1). Please tell me if that is the upstream or the downstream sensor? Thank you.

@PanameraTurboSEHybrid 6 лет назад

Archon Rye Your scanner is suppose to tell you if it's it's upstream or downstream by showing bank 1 sensor 1 (upstream) or sensor 2 (downstream).

@MsTragedy Год назад

Hey I have a voltage of 3.2 on both upstream 02 sensors what do I do? Please help

@hammer8809 11 месяцев назад

Depends on the vehicle, v6 3.0 liter GM LFW have same sensor for pre and post cat.

@uphill248 6 лет назад

So does the check engine light go off once you change the sensor? I have a 2006 Odyssey. Oxygen sensor bank 2. I'm still trying to find out where it's located.

@arturosalvador9237 6 лет назад

No. After the change, you must drive your vehicle at least a week or two and then it will go off automatically.

@PanameraTurboSEHybrid 6 лет назад

Or you can clear the code either a obd2 reader.

@jonboatmorava9115 4 года назад

You could have the same issue as me. If you bought anything other than the exact brand that came out of it the computer won't understand the sensor. From what I understand these shops keep replacing them and charge the crap outta people who don't know better. There are serious issues with o2 sensors not being actually made for your car. I bet whatever your issue is if you buy actual oem o2 your problem will vanish

@pedrocordova9317 4 года назад

Hey, so i ordered both Bank 1 and Bank 2 O2 sensor downstream, for my 2007 Express 3500. Pretty much the same part. But the difference is that when i took one of the down stream O2 sensors off, it looked like your Upstream sensor. You think someone messed up and put the wrong one on? or is it good? lol. thank you.

@1AAuto 4 года назад

+Pedro Cordova It's possible! We recommend having a mechanic take a look. Thanks for checking us out!

@stevee5044 5 лет назад

wow excellent thank u

@1AAuto 5 лет назад

+Steve E Thank you for your positive feedback! We are happy we could help.

@unkhammunankh7252 7 месяцев назад

Are they interchangeable? I’ve ordered a few from Amazon that are listed as Upstream/Dowstream, but no markings on the product itself and all look the identical, unlike the ones I pulled from my vehicle. Anybody care to provide insight?

@diversity2739 4 года назад

thanks

@raka3784 5 лет назад

Thank you so much

@1AAuto 5 лет назад

+Shkelzen Raka Thanks for checking us out. Shop here for high quality auto parts: 1aau.to/m/Shop-1AAuto-c

@cassielao8463 4 года назад

so are there any difference between upsteam or downstream ? as for as the actual sensor ? because out of 1 millions review noone can seem to answer this. i have a spare downstream sensor for my other civic and my other first upstream went out? connector are difference. get where i'm going with this ?

@jamesadame6189 4 года назад

I have a 96 Jeep Grand Cherokee. Are the 02 sensors the same as a 96 Jeep Cherokee?

@luisherrera3896 4 года назад

Excelent video! one question, do you ship to Mexico??? regards

@jonboatmorava9115 4 года назад

Which one will actually work for my truck? So far I have bought several sets from several places, maybe here also I'm not sure, and they all have been rejected by my truck. Why is this? I've bought almost every brand and type that the cost isn't outrageous. So do some vehicles have to have certain brands ? My 2000 gmc Sierra 1500 2wd 5.3 has rejected everything so far. Next is some that cost over 200 for the set.

@jat-justamaturetech-philpj8285 Год назад

I have a 2000 wj jeep. My OBD2 say's im running rich po172, po175 Bank 1 and Bank 2, but you just said there are only one bank? Can you clarify??

@jalopyrips8081 6 лет назад

There are at least 3 four cylinders with 2 banks . An I have seen engines in testing with an afr on each one

@bigboytoyz541 3 года назад

Some jeep 4.0 have split exhaust manifold having 2 banks

@mapulento8791 5 лет назад

Sentras (4cyl.) Have 2 banks with up and down streams!, (2 heated & 2 fuel\air) ? How do you determine which plug is which off the harness? And which type of sensor goes upstream, (heated or fuel\air?) once you figure out banks and streams?🔧

@mapulento8791 5 лет назад

Stripped the wireharrness open couldnt macth colors on the wires! So i used length to determine position or location and got the car running.... Now the ecu is not setting keeps running a loop on the programming..

@time2maked0hnutz54 3 года назад

Suggestion-sell the car & get a Toyota/Honda🤷🏽‍♂️😂

@seancomerford5724 3 года назад

2015 Ford Focus Titanium any idea which one is bank 1 sensor 1

@jamalmakki3700 4 года назад

Hi guys KIA Sorrento 2012 with 4 cylinders 2400cc engine got codes p0032+p0132 on OBD2 checking .. The AFR wide band range with 5 Wires the car works fine ... I changed it to stop that check engine light with other used One ... But the light still on with codes p0031+p0132 the engine warks fine the same with no exchange... I NEED to know how to recognize each wire on that sensor side + harness side

@MississippiTaiter Год назад

Watch this video, but literally the only part I wanted to see was the O2 sensor it connected up to it and didn’t show that so it was kind of pointless in my opinion but props on the following of y’alls page

@rodleisam 10 месяцев назад

how many downstream o2 sensor does a kia optima 2013 LX has? Thank you

@b33b1m0v3 4 года назад

Like all other videos it did not answer the question. It described the location of the sensor.thats all. But the answer is: any oxygen sensor can be either upstream or downstream. If you have one in a box or on the table and you dont know where it goes remember you can use it for either upstream or downstream.

@jennyholmes693 Год назад

Hey is this true for all vehicles or my 2014 kia soul....🤔🤔

@legendarymario3 6 лет назад

On your site I ordered my oxygen sensors. I drive a 2005 Hyundai Accent, it said Upstream Downstream. Does that mean one sensor works for both?

@1AAuto 6 лет назад

+legendarymario3 It would be the same if that's how it is labeled. Have a great day. Hope this helps you out. 1aauto.com

@damygeebo 3 года назад

A1 sent me a "downstream" sensor that visually looks identical to my upstream sensor. How do you visually tell the difference between the two sensors when they are not on the vehicle?

@SerenoOunce 2 года назад

Physically and functionally they are identical. Only difference is what the internal heater's resistance is calibrated for (6Ω - 16Ω). This is why even for universal sensors there are multiple SKU's. Generally the downstream will have a lower resistance than upstream, and likely why they are more prone to failure.