How to Replace an Oxygen Sensor in Your Car (Air Fuel Ratio Sensor) 

⬇️Scotty’s Top DIY Tools: 1. Bluetooth Scan Tool: amzn.to/2nfvmaD 2. Cheap Scan Tool: amzn.to/2D8Tvae 3. Professional Socket Set: amzn.to/2Bzmccg 4. Wrench Set: amzn.to/2kmBaOU 5. No Charging Required Car Jump Starter: amzn.to/2CthnUU 6. Battery Pack Car Jump Starter: amzn.to/2nrc6qR Things I used in this video: 1. Actron Scan Tool: amzn.to/2ngeCQJ 2. Oxygen Sensor Socket: amzn.to/2B6DEYu 3. Breaker Bar: amzn.to/2BEo9Ep 4. Flashlight: amzn.to/2BFak8y 5. Common Sense 6. Full HD Camera: amzn.to/2AvoEk7 7. My computer for editing / uploading: amzn.to/2i2sKYz 8. Video editing software: amzn.to/2jv5Fhf 9. Thumbnail software: amzn.to/2k7tz6C 🛠Check out my Garage to see what I use every day and highly recommend: www.amazon.com/shop/scottykilmer ❗️Check out the Scotty store: goo.gl/RwhRGU 👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics: goo.gl/ohy2cA

I had my check engine light come on.. I had a bad O2 sensor. thanks to this video I was able to replace it in the parking lot of pep boys for about $75 bucks.. including the socket. Pep boys quoted me a $370 for the part and labor for the "2 hour 45 minute job" Took me all of 45 minutes from the time I walked in to pep boys to the time I drove out of the parking lot

You're a life saver. My car died on the highway this morning and then again at a red light once I exited. Made it to an auto parts store and did the repair in the parking lot thanks to your tutorial. Just wanted to say thank you. You're the first place I turn to for how to's.

This man deserves a medal.

Thank you yet again Scotty!! I have used after market parts since I have been working on cars and I am 60 years old. I cannot remember replacing a part with an exact OEM part. It never made a difference. But I never changed an O2 sensor. Well after replacing my sensor with an after market part, that the seller said is compatible with my car, failed as soon as I started the car, I looked to see what "Scotty" had to say. I should have done that first. I replaced the part with the OEM sensor and now it works! Thanks again!! You rock Scotty.

im so happy i found your videos! i just changed my spark plugs today in a 95 saturn sc-2, found oil in them, so watched your video on how to change my gaskets, and since oxygen sensor was next on my list, i was thrilled you had this one! bought my car used, in rough shape, and im slowly nursing it back to health with your help!

Blessed to have Scotty around! He has helped me more than a handful of times. God bless

Scotty you are a LIFE SAVER! I've had several problems with my PT Cruiser GT lately. My car was throwing codes like crazy! So I cleaned the ecm with the electrical spray you recommended to remove the oxidation and so far so good, you saved me big bucks! The only code left is bank 2 o2 sensor downstream so after watching your nifty video and as soon as the storm passes I'll be out to change that sensor. Thanks a million! True fan of your work!

they are complex feedback systems, and as such, can do many different things when they go wrong. And testing them requires all kinds of experience and a freeze frame oscilliscope to even start testing them out fully. They can cause a rough idle, but so can tons of other things. Most people pay a mechanic to analyze them with a dealer level scan computer and watch the wave forms they put out while doing certain tests of the fuel system.

worn timing chains often do that, check that out first. Also check for vacuum leaks on the intake, they are known for that too

I always enjoy watching your videos. You keep it interesting like no other. Thank you for all you do.

My car has been in the shop for an entire week and still haven’t no call from the mechanic I literally told him it was an oxygen sensor and dude is taking his sweet time fixing it I’m considering just tellin him never mind and doing it myself

Thanks again. I did the catalyzer cleaning (it looked pretty good before the cleaning with no melting points) and it was a pretty PITA. Until now not even one single code appeared, I hope that the cleaning help me get rid of the problem. Thanks a lot Scotty. Keep up the good work!

Love your channel. Lots of information. I have a Saturn Vue 2007 V6 with Honda engine at 120k miles. It started to idle a little rough (not terrible, but definitely not smooth) weeks ago with very occasional misfires of all cylinders. No other error codes. New timing belt and water pump. Changed MAP, air temperature sensors, PCV value, purge valve and EGR. Air intake manifold cleaned. Throttle body cleaned (not dirty at all). Fuel injector cleaning additive used twice. Always used neighborhood gas station gas which is certified TOP TIER with STP additive for fuel injector cleaning. They all had no effect on rough idle. OBDII scans consistently show a few (negative) percentages like -1% to -5% fluctuation, rich for STFT Bank 1. Bank 2 STFT is always lean. +3% to 14% fluctuation. Why Bank 1 always rich and Bank 2 always lean? Didn't see vacuum leak when I did a smoke test. Lazy or faulty O2 sensors? Unlike other cars, this car's OBD data does not give upstream O2 sensor voltage output (broadband sensor I guess). So I cannot check 0.1 - 0.8 V O2 sensor oscillation. Its downstream sensors' voltage responses can be plotted by OBDII scanner. They oscillate actively between 0.1 - 0.8 V as expected. I need some help here. Thanks.

I LOVE THE WAY SCOTTY GOES"UUUHHN"WHEN HE PULLS ON SOMETHING REALLY HARD!IMMA TRY THAT WHEN I HIT SOME COOCHIE FROM THE BACK!"UUUHHN"

Hey Scotty big fan!! I actually have a 2004 sequoia with the same problem, I followed your video step by step and managed to change the sensor myself with just $51 bucks!!

I only use factory oem sensors as they are very critical for the cars running and I see aftermarket cheapies often not work correctly.

So glad you had a video on this. My crappy 02 pt. cruiser has been suffering from this particular situation for about a month and now I know what I need to do. Thanks!!!!

if you're talking about the power voltage supplied to the sensors, either the computer is bad or the wiring going to the sensors are bad lowering voltage. fuel pressure varies for all makes and models, any auto parts store can tell you on their computer

Scotty said the Oxygen Sensors are hard to replace; however, easy to plug in; however, it was easy to replace my sensor, but it would not plug in and "snap" in place. It's tight so my hand barely fits and when I push the connections together there was no SNAPPLING in place. I'm not sure if it was totally connected, but it was working okay. Others, too, have had issues with the connections "snapping" into place even when they are OEM replacement parts.

sure can, I was actually surprised by the handling ability, especially at higher speeds.

Thanks Scotty for a very precise, quick and to the point video.

it's anti seize and electrically conductive at the same time

Yes, I never use bosch on any car that didn't come with them as stock sensors, as many german cars do.

Thank you for posting this. I have a Hyundai Accent and the 02 sensor went out. Used your video to change it out and had no problems.

If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. I answer your car questions LIVE there. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event. You do have to be a member of google plus to ask questions, so join up, it’s all Free.

Scotty is the man!!

I just replaced my O2 sensor after a P0051 code on the 2003 4Runner V8. I appreciate your video!

I live in texas, but ford sends me new cars from detroit to road test.

Thanks for being an honest mechanic.

I think it would be cool if you made a video on how to test upstream and downstream sensors using a live data scanner. I know it depends on the type of sensor for how to test them, but it would be very useful information and you won't even have to get your hands dirty.

Just came across this and I'm impressed! I have a 2007 Toyota Prius. Check Engine light is on. Brought the car in to a mechanic and was told it's the heater for the "passenger side" oxygen sensor. Was also told it would cost $700 to replace (parts and labor). I'm a woman, and after seeing your video... Methinks someone's fleecing me. I have done my own car work in the past (LONG time ago - starter, brakes, misc on a 1980 Datsun 210!). Am I capable of replacing my own oxygen sensor in a newer Toyota Prius?!

hondas carbon up inside the engines, try my video "how to clean fuel injectors on your car'

after replacing the downstream sensor, i couldn't believe how much of an effect it had on driving, especially from a stop. much, much smoother, and low amounts of gas didn't cause the engine to judder. just wow.

Scotty, your videos are amazing! I replaced the upstream O2 sensor in my 2003 Mitsubishi Galant with the factory brand (Denso). I also cleaned out my throttle body and the mass air flow sensor (with mass air flow cleaner). After doing these three things, my car idles so low that it dies. I tried unplugging the battery overnight, hoping that it would reset the computer, but it still idles too low to stay running. I have to keep my foot on the gas to keep it from dying. Any ideas on how to fix this problem? The idle was fine before I did these three things.

Thanks to this video, I was able to fix the poor running on my Clio for £23.95. Sorted, and it passed it's MOT too.

hey Scotty, I was just wondering if this is the same way to fix the oxygen sensor on a 2002 Mitsubishi Montero? Great video by the way!

good ones come with a small package of the copper stuff used on them. If not, buy some from an auto parts store separately.

Scotty Kilmer - Is copper package the name of the thing you used in the video?

Mine just went bad on my 2000 Honda Accord with 400k miles. I keep it running like new by watching these videos.

Which is raises the question which is spark plug number 1???

I took your advice & changed both sensors it made a huge difference , the 2nd sensor (after CAT) definately needed replacing also to restore full performance. Luckily mine were only $20 each.

Love the Videos Scotty !!!

Thanks to this video, my new 1996 Ford Explorer was fixed before it even had a real problem. Yeah, I bought an old SUV, but the older they are, the easier they are to fix, and it's just new enough to comply with OBD2 scans. Also thank you Scotty Kilmer for giving us the tip about BlueDriver. SOO much headache and expense averted.

My 2010 honda civic is slightly hesitating when I take off in 1800-2000 rpm range. And has low idle at times... can that be a dirty throttle body?? I already cleaned the MAF sensor... no check engine lights.

thanks for replying my e mail scotty! I changed ox sensor on my subaru forexter xt as you said with OEM denso no engine light anymore all ok many thanks dear scotty you are the king of automotive ! salute from istanbul

My 2005 kia Sedona lx has a bad oxygen sensor. I don't know where to find it or how to remove the engine cover thing. The van will not start at all and I have no tester so how do I know which to replace. Please help!!!

yes, oem parts are often much better, though they cost a lot more too they tend to last a lot longer than cheaper made aftermarket parts

Who do you get the electrical clip off? I tried for hours to get mine off today and it wouldn't budge.

Thanks Scotty, I always enjoy your fun demonstrations. I hope you have time to repond. I bought a 2004 fx35 last year and it failed smog check for P0138 and P0158 which are the post CAT o2 sensor issues. I went ahead and changed them both and I found out that it made no difference. When I delved into it a bit more I realized that all 4 o2 sensors once in operating temperature just show a steady voltage, the post CAT sensors go to 1.275 volts and max out, and B1 S1 is at .3 V and B2 S1 is at .64 with .01 v oscillation. When I accessed the ECM to see what is going on, I found that someone had simply joined the wires between S1 and S2 on B1 (and not B2). For the life of me I cannot figure it out why would anyone do that and why would ecm accept this. BTW, the car runs smoothly and aside from the "service engine soon" light on there are no issues. I also verified all 4 o2 sensors they are fine, even the original sensors that I replaced were fine. Anyone out there has any idea what is going on. I hate to revert it back to what I think it is supposed to be and find out now that the car is not running smoothly anymore. I have to point out that mileage is not that great 14-17 mpg. I unplugged B1 S1 and drove it and it still worked but not smoothly, it got slow to respond to acceleration.

Ok, I subbed when you popped outta the trunk 😊😂 ty!

Hi Scotty..cant thank you enough but am grateful of all what you do and share. I learnt alot from you Thank YOU.!!! I watched your video how to replace sensor 1 bank 1 and I was able to do it on my own. Code P0130 popped up twice in the reading. Confident, replaced the Sensor 1 Bank 1 located before the CAT on my Mazda 3 2005 it was done accordingly. Reset the vechicle engine was off but then it came back in again after idling for 5 mins. After resetting it, unplugged the Negative from battery stepped on the brakes consecutively 5 times, idle it for 20 mins then turn A/C on for 15 mins then turned it off, engine light OFF, took it for a spin, turned it off turned it back in idle it 5 mins engine light ON. I had replaced the Upstream and Dowmstream with Bosch brand and new and old matched but engine ligjt ON after an 1hour. Ive cleaned the Mass Flow, the Throttle Body, reolace air filter, replaced the thermostat and the tempature control sensor and done oil change and new spark plugs as well. All that Engine light ON. Emmssion test also codes read NOT READY and failed. Ive also poured a gallon of Lacquer Thinner in a half tank drove it for half hour. All what was done to it made the car run smoother but still Engine Light ON code reading same code P0130 twice. What is going on. Need your help Scotty to solve my issue.

do we need to disconnect the battery before inatalling?

not normal, but sensors only read what they are fed, often bad fuel injectors or other engine management problems cause that, like a bad MAF sensor

i was getting code p0420, someone told me it was the 02 sensors, so i replaced them both. now i'm getting codes p0130 / 0132 / 0134 / 0135, wth is goin on with my car?

Love Scotty a fantastic Knowledgeable Bloke, i call him Motor Mouth as he talks fast like an engine being reeved up lol

Can u use used O2 sensors

try the sensor and pray, cause many things can trip that code, from vacuum leaks to weak fuel injectors. You might try my video "finding engine vacuum leaks with a cigar" also.

I bet this guy still knows how to party

thanks for the info about the org. brand instead the aftermarket cheepy ones made a world of difference

Man Scotty is that DUDE! I appreciate you man!

Thank you Scotty! I just found out my car transmission gasket was bad and had leaked all the fluid! Will fix the exhaust pipe issue soon! ;) keep up the good work and thanks for all the wonderful videos! Cheers!

Often a weak fuel pump, try pressure testing it first. If not, try my video "how to clean fuel injectors on your car": AND find if you have a vacuum leak on the engine using my video "finding engine vacuum leaks with a cigar"

I like this guy, he really enjoys working on vehicles

most used delco. If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. I answer your car questions LIVE there. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event. You do have to be a member of google plus to ask questions, so join up, it’s all Free.

Merry Christmas Scotty!!! Thanks for all your videos wish I had a chance to meet you

yes

Thank you very much Scotty for showing us how to change an O2 sensor. Regards.

Sure will scotty just to let you know i watch you every saturday morning even when i work weekends i still tune in to you (the best mechanic i have ever see) :) thanks scotty.

upstream is before the cat, downstream after the cat. Left and right are engine banks, left being the driver's side, right the passenger side

deepest gratitude

Thanks Scotty!!!, Just changed mine today, just with this video. Thanks!!!

Will be changing bank 2 sensor 2 on my 07 camry v6. Of course, it just has to be under the car with the plug inaccessible unless you remove the bottom plastic plate. Should be at most a 10 minute job but this just adds to it. Labor at the auto repair is around $140- no thanks, will do it myself.

If you like my car help, be sure to watch my live car talk show every saturday morning at 10 AM CST on google events. Just go to my scotty kilmer channel on youtube saturday morning at 10, and click on the google plus icon on the top right corner. That takes you to the event where you can ask me questions Live. You do have to be a member of google plus, but that's free and you can just google "join google plus" for that. thanks,

could be, just realize sensor codes can pop from things besides bad sensors, such as weak fuel pump or injectors that are leaking

Hi Scotty. Your videos are always a hit. I always lol when you do the tennis player grunt when doing something tough. Keep up the good work man ;)

sensors can go bad and do that, but so can tons of other things, like weak injectors causing sensors to show lean running. Try my video "how to clean fuel injectors on your car" first, that often stops that code on a toyota

I figured that's why I wanted to ask you to verify that fact. Thanks Scott your the best I love watching your videos very educational I learned some decent things about cars issues!

Scotty Kilmer is the man .....................

Never ceases not there to make it seal good it is there to make it come out easier

Hello Scotty, do you have a video about P2096? when Post Catalytic Converter is too lean. I used FIXD scanner but it shows a list of possible reasons as: 1.- Heated Oxygen sensor (HO2S) Bank 1 Sensor 1. 2.- Rear Oxygen Sensor (O2) Sensor. 3.- ECM Programming. 4.- Oxygen (O2) Sensor. 5.- Heated Oxygen Sensor (HO2S) Bank 2 Sensor 2. But it doesnt shows a specific root.

I always trust your vids Scotty no matter how many videos I watch on you tube 👍

This guy is a international treasure 👍

I got my valve gaskets (front and rear) changed by Firestone..cost me about $500. After few days of driving the check engine light was on and this time it showed couple of codes, P1130,P1135, P1133. - Coolant Temp sensor- Coolant fluid is out, Air Fuel Sensor 1 Bank 1 harness issue. Firestone wanted to charge $200 for analysis, part would cost about $291+tax from Toyota dealer and another $200 for labor. Got Denso part 234-9007 an upstream rear sensor 1 Bank 1 (6 cylinder engine) for $96(from Amazon). A 22mm long wrench for $12, a PB Blaster and replaced it. While I was there bought a Engine degreaser and cleaned up the engine bay...the car sounds better and cleaner. After replacement, initially the engine smoked crazy...may be burning the extra degrease and settling in by burning the copper antiseize... drove about 10 miles and no engine check light yet.....thank you Scotty

change the one and pray. Cause those complex feedback electronics can have many problems, well beyond a bad sensor, EVEN with that code popping up.

sensors change their readings as the vehicle is running, they should go up and down like waves int he ocean when graphed on a meter. Check that first

replace the oxygen sensor on the exhaust, and check for oil leaks that get on the exhaust and smoke. See my video "finding and fixing car oil leaks"

I wish Scotty would run for president

I learn a lot from your videos, Thanks Scotty!

Like that 'Pull the Scotty Kilmer out of the Trunk' trick. LOL.

it's running lean, and in those, almost always leaking intake manifold gaskets, one cow of a giant job. But, if it runs ok, you can ignore the light as the leaks can be rather small and not hurt anything. You need tons of tools and hours of time to replace those parts.

Scotty popping out the trunk!!!! LMAO!! Gotta love this guy!!!!!

Scotty saves the day again with his video! I need to buy Scotty some coffee with the money he has saved me

I love how unrealistically easy you get the O2 sensor to break free🤣🤣 meanwhile I had to put all my might into mine

Ooh I came here for the oxygen sensor and I love that Mustang

I've had three cars now that never threw an O2 sensor code.Now I know that one of the ways an O2 sensor goes bad is that it will still produce a voltage but it's too low.If your MPG's start going down but there's no O2 sensor code I suggest you test the O2 sensors anyway.On my current car, a 1990 Toyota Camry 2.5L V6, I never got an O2 sensor code but the car was running pig rich.I hooked up a voltmeter to the rear O2 sensor and VOILA,voltage told comp that it was lean when it was really rich.

we mechanics don't use the term third sensor. But the last sensor is the one after the cat.

Thank you! I just save $200. Mechanic said it was a 5hr work

yea, jacking it up is easier to get at it, just get an oxygen sensor removal socket to get it off with, places like auto zone sell em cheaply enough.

often a bad main computer if it's really low. Just realize those systems only operate with a 5 volt reference signal though