Wideband O2 sensors, Narrowband O2 sensors and Fuel trim.

In this video i diagnose a car with fault codes caused by a bad Wideband O2 sensor.
While we diagnose this fault let's talk about;
Wideband O2 sensors, Narrowband O2 sensors, fuel trims and their relation.

[theGADGETSplaylist]

This video should be mandatory in auto schools. Well done, Dan!

[DevonBbrown]

Best automotive teacher I've ever seen.

[philh]

this dude is smart he knows how to explain things simple to understand!

[triniscorp]

Hey Dan I know this video is a couple of years old but it just saved me over $2000 dollars. 2006 Acura TL 216, 000 miles P0420 catalyst below threshold bank 1. But short term and long term fuel trimmed maxed out. Downstream sensors were reading lean condition.Sprayed carb cleaner to verify downstream o2 sensors were working. They were. Long story short coolant temp sensor was +40° off. Making the ECU think the car was hotter than it was and giving less fuel. Which the o2 sensors were reading and ecu trying to compensate with fuel trim. No 02 sensor replacement ($200 × 4) no catalytic converter replacement ($600 ×2). I do my own work (free). $30 coolant temp sensor fixed everything. Cant thank you enough. If you're ever in NYC I owe you a ton of beers.

[PeaceBeTheJourney.]

I cannot think of another skilled trade where we are required to have such vast knowledge yet earn such poor pay.

[kyhomegarage]

Excellent case study my friend. Thank you for your time to bring these video to us. Cheeers

[dannykapito]

You are teaching the whole Earth Mr.
Your teachings are better than those at the University

[spaceboundmg]

Watching this video 4 years after it came out and im amazed. Dan, thank you for setting this up and explaining all of this simple and very easy to understand!!

[bficful]

Dan - you killed it ! So clear and concise. Grateful you took the time to post this. Really helped explain the P0172 I had on my Subaru Forester.

[jb_bmwrepairlyfe]

Keep making these videos keep chiseling our brains as technicians! So far you have not lost me because of the thorough explanations!

[brunocorrea]

Awesome! I always wonder what was that short and long term fuel trim on scanners and never found neither the classes I took told the answer. Thank you for this video, strictly to the point and calm talking, very well teached!

[MetaphysicalChris]

Dude, you are awesome! helped me with Wide band O2 sensors. Clearer than anything else so far.

[ljsambell]

Excellent coverage - thank you very much - and I especially like how you determined to add some fuel ( brake cleaner) and see if and how the narrow band sensor downstream responded in order to validate the upstream unit.

[quincym]

Great job explaining this in simple terms! Best teacher so far! Im very gratefull for your very helpfull videos!

[jasoneyes]

What a great lesson Dan. My understanding of O2 sensors was basic till I watched your presentation. This topic is deep. I was glad you presented it in a slowed manner. I was actually haveing mental gymnastics calculating what you were presenting. Never knew widebands were current sensors. Just replaced the downstream sensors in my 180000 mile N62TU. Car runs so much smoother. I think the downstream sensors play a role in fuel trim, not just cat effieciency monitors which was the code I got on bank 1 and 2. I have no clue on the algrithms BMW uses in the DME.

[HelgiThorisson]

This video is so good that I watch it over and over again.

[georgema]

You are the King of diagnoses 🙌, I learn so much from you😎

[EngineMisfire]

If I had seen your video a while back, you would have saved me many hours of debugging time and research on this topic. Hats off to you sir.

[jamesbruno]

Great detailed explanation Dan! Thanks for taking the time to film this! 👍

[hftiller]

Diagnose Dan, you are the MAN!!! I ran across one of your videos the other day and I am such a fan now. You are exactly what the new generation needs as a common sense back to basics teacher. You are mandatory must watch for my younger crew. Keep doing what you do and we will keep subscribing, watching and spreading the word!!!