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

Oxygen sensor replacement. How to replace a oxygen sensor in your car DIY with Scotty Kilmer. How to replace air fuel ratio sensor). How to check bad oxygen sensor. Oxygen sensor location, inspection, removal and repair. DIY car repair with Scotty Kilmer, an auto mechanic for the last 50 years.

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[scottykilmer]

⬇️Scotty’s Top DIY Tools:

Things I used in this video:
5. Common Sense

🛠Check out my Garage to see what I use every day and highly recommend:

❗️Check out the Scotty store:

👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics:

[blatnick]

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

[elspethwilliams]

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.

[propenn]

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.

[Wheelsky]

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!

[missmericano]

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!

[scottykilmer]

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.

[scottykilmer]

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

[Flanker]

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!

[timguy]

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.

[scottykilmer]

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

[h.]

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

[kenm]

This video showed me that I should clearly just go to a mechanic.

[jirikrajnak]

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.

[scottykilmer]

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

[dennishassler]

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.

[hehjr]

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.

[daviddejesus]

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!!

[ypbevze]

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

[robertvanwijmeren]

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