Oxygen Sensors Explained! | An Introduction Into The Theory Of, Workings Of, And How They Fail!

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-----I assume no liability for property damage or injury incurred as a result of any of the information contained in this video. I recommend 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 my control, 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 myself.-----

[BrettMissen]

This was probably the best explanation of O2 sensors I have seen. Simple, easy, informative and practical all at once. Wish we had this at Automotive Tech school many years ago.

[sharonbirrer]

I just want to say thank you for your videos i have learned so much. I am a grandma who's 03 Outback was my grand youngins school bus. But it quit running. So i really love your content, you've given me, a super non mechanical granny the confidence to crawl under my car and try to do some trouble shooting myself. I appreciate what you do & thanks again.

[bbodan]

It's been a long time since watching Mr Subaru. Happy to see any Subie fix vid where he talks nerdy and explains fundamentals beyond just showing things wrenched. More how to vids please.

[marieholmes]

Please do a similar video regarding Cats and P0420 diagnosis and repair. Thanks!

[alexmessina]

Great stuff! But you MUST now do the follow up on Wideband sensors which wld be pre-cat sensor in almost all Subies since early-mid 2000s ... very important to understand failure modes and can be tricky😱 After a long diag, finally discovered an intermittent failing wideband O2 with a P0030 code on 2004 Forester with EJ251 was caused by sensor element internal resistance not falling quick enuf to meet PCM programmed parameters ... in this case, PCM requires less than 50ohms within 30sec of start or after fuel cut off condition. Very tricky to nail this, but wen u r going to charge a customer $700 for a new part that u can’t return u need to be dead certain. Lets do failure modes, diag and test procedures on wide bands? 😉👍

[wim]

yes, understanding the scenarios that the AF or O2 sensors get involved in, helps a lot with understanding error code diagnostics & source-of-the-problem finding.

[chief]

I was not expecting to learn anywhere near this much from this video as I did. Excellent information and very well laid out. 👍🏼

[Abucody]

You can’t get any better information than Mr. Subaru.

[Toolaholic]

Coolant takes them out too, the Fords with the 3.8 which had headgasket problems would take them out when the headgaskets blew. ln certain year Dodge truck, the O2 sensor also is involved with shifting of the transmission.Have fixed a few transmission problems in these replacing the rear O2 sensor.Do not top off the gas tank, EVAP system needs space and have seen O2 sensor codes appear from this

[nevoyu]

I'm working on figuring out the cause of my catalyst efficiency codes so this was great timing.
I've long determined the converter is gone, but working on debating if I should swap the sensors "while I'm in there"

[toddb]

Thanks for the great intro to oxygen sensors!

[KarlBrouillette]

Excellent pace and clear explanations. Like some before me, I agree this is so far the best explanation of O2 sensor function and diagnostic. 👍

[christophermisiano]

Wow this was awesome. The best explanation of something that I have been puzzled about it. Thank you Sir,

[wen-tsouwong]

Finally, a most comprehensive explanation on this item. Question though : will the slots in the casing determine the workings.? My supplier insist that the one with the smaller slots are the correct based on the part number. But after installing, engine kinda running weird - like a very short hesitation when acceleration.. Especially when the AC is on..

Thanks for the great video..👍

[PeatyR]

Great Video as always. Picked up a used 2015 Crosstrek Premium with 92K mile for my kid. I've been doing various things and this is one I like to do at 90 -100K. Relative to the other Subaru's O2 sensors it's in a pretty easy spot to get to. Replaced the front one with a Denso brand which seemed to be the exact same as the OEM I removed. Right down to the color of the wire coating and wire tie fastener. I consider it inexpensive insurance for the future.

[bigblueskyfarm]

Advanced chemistry and it was explained in mr subaru terms. Good knowledge to really understand O2 sensors

[eagles]

Wow ! This was the best explanation of O2 sensors i had in my life...I have a Subaru Legacy 2013 with only 67.000 Klm and i really enjoy your work thk's.

[JonathanGonzalez-obth]

Top 20 comments, SWEET!
Mr.Subaru you’re VERY HELPFUL
I watch your videos for fun and information

[teh]

Very well explained. I've seen more air/fuel sensor problems than O2 sensors with Subaru.

[xEmerzon]

I remember giving my tuned rs to a shop in Utah that “specialized” in Subarus to fix a surging issue I had while driving, left it at their shop for three months while I was out of the country and came back to them “solving” it by replacing my charcoal canister. I took it to Colorado for a friend’s bucking and surging the whole way there, under wot it ran normally. I happened upon the Subie Doctor while in Colorado and within ten minutes of looking at it had already diagnosed the issue and put in a brand new oem o2 sensor.