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O2 Code, Dirty Throttle Body (stalling problem) & Mechanic Incompetence

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It must be horrible for the average everyday car owner to have to deal with the code reading, parts changing mechanics out there. Join me and my class as I teach them how to NOT be a parts changer!
This 2005 Dodge truck was brought into my class at Rosedale Technical College. It is owned by a friend of mine and had come from another shop where they built in problems. First dealing with a stall, no-restart, then finally just a stalling issue coming to stops and a downstream oxygen sensor code it never had before. Let’s engoy the parts changing path together 🙂
Parts replaced in an attempt to fix a stalling problem.
1. Crank sensor, which fixed the original stalling, intermittent no start condition
2. Truck still had a stalling problem but would always restart
3. Engine computer was replaced, still stalling
4. It now has an O2 code, still stalling
5. Both rear O2 sensors were replaced
6. O2 bung stripped out so a new pipe was welded in, still stalling
7. Still has a Bank 1 Sensor 2 heater code which proved to be a built in fault. The new ECM installed had an issue with the O2 heater driver
8. Another ECM replacement fixed this issue with the O2 sensor but its still stalling lol
9. Stalling problem was just a dirty throttle body
10. Truck comes back two days later with a different B1S2 code, this time it is a lean code caused by a poor weld (exhaust leak)

For you customers out there. Find yourself a good diagnostic tech and never leave him. Sure he may charge you $150 up front to look at your car but you can rest in knowing it will be right. It is time to educate our customers about the value of a proper diagnosis and how expensive it can be to just read a code and change a part.

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at as an eBook or paper book.
Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium There is a 14 day free trial.
On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends 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 the control of ScannerDanner LLC, 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 ScannerDanner LLC.

34 thoughts on “O2 Code, Dirty Throttle Body (stalling problem) & Mechanic Incompetence”

  1. To see this full 2 part series, subscribe to ScannerDanner Premium…

    There is a 14 day free trial
    Don't be mad at me for not including this O2 Heater circuit tests here. I did give you guys the complete portion of identifying and repairing the cause of the stalling problem. Yes, another dirty throttle body 🙂 This IAC data is different than others I have done and will be very useful to you guys. Thanks so much for all of your support! Hope to hear from you both here and on SD Premium. Have a blessed day.

  2. i have seen some bad ECM computers put out by GM

  3. that is a common problem in dealerships,i know for a fact. but the most knowledgeable are the least paid. the man to put on the most parts makes a killing. and to tell the truth the managers dont give a shit. i've heard the phrase "more turnover for the shop"

  4. Big issue on Trail blazers…remove and clean the throttle body, install and run without accessories for 5mins and fixed.

  5. At about the 11min mark you were talking about the sludge in the throttle body, I understand cleaning the butterfly area for the sensor reading, but you said beyond that it (sludge) does not matter? Doesn't that sludge coat the injectors? What happens then? Does it send codes to the fuel trim? And if so how do you look for it with a scanner? Thank you..

  6. I found it hard to pay attention to this stuff when I was in school 7 years ago and it held me back!! Now that I’ve been in the field for about 5 years and know a lot more I can really pay attention and take in everything you are showing us. Huge help Paul thanks a lot man you are a blessing!!!

  7. Jim Ferguson says:

    Hey Scanner Danner. Saw you on Eric the car guy and then watched this video. Incompetence is rampant in the automotive trade even at the so-called dealerships. In Australia some years ago I bought a used 1988 Ford Fairmont Ghia top of the range model with 80,000 kilometres on the clock. After a while it would refuse to start and then suddenly correct itself. It also revved up and down at idle. The Ford dealership changed many parts and also swapped known good components (including the computer) from cars in stock and they still never discovered or corrected the problems despite many hours of attempted fault finding and major expense to me. They obviously lacked the training or expertise to solve the problems. I eventually gave up, got rid of the car and purchased a new Nissan Pulsar Sport that ran for twelve years with no problems. Truly, competent technicians are very hard to find and worth their weight in gold. Unfortunately the unwitting customers are taken for an expensive ride by incompetent dealerships and mechanics!

  8. Franco M says:

    At 1:40 my guess is this is a Ram, I hate them… then I read the bio & it is.. Junk… Ok. Yes it is called a Bung. Funny word, it's British btw. You are an awesome attitude type dude.

  9. I had a Business doing Service and Repair and Manufacturing of Commercial Signs and Lot Lighting ( Building or Parking lot Lighting )… Neon Signage….If i went out and misdiagnosed a Service repair and put too much new supplies ( Lamps and Ballasts/Transformers etc..)..i would either remove and replace the parts i felt were defective but ok…or leave them in ( new parts ) and take the loss and not charge a Customer…or at least charge a Fair Charge for the Right Service…
    Do they know …not always….but if I found something simple…I MISSED …during a Diagnosis and told them i had to replace expensive parts….then found i could fix it CHEAPER…i would rather help a customer hoping they will call me again next time ( which they DID ) rather than take advantage of them due to my mistake…
    Replacing 6 parts till you fix it is not Good is lazy Diagnosis…

  10. Word probably on comment bellow ,scrap it it does not belong there

  11. I have an opinion on this,probably years ago in Portugal it would cost a fortune to get a drivers license, and to me I would say why someone in an island like mine (PicoAzores) need to know basisiclly how to fix an automobile in order to get your license , guess if it was here it would be worth it , small island short trips , big Country long trips , oh forgot the money spent to get the license in the old country would be well spent? Knew someone with a drivers license from the old country only got one here after third try, also one that here he don’t even know how to do an oil change , got a drivers license at the first try, tell me what makes sense

  12. Good stuff. Thanks for posting.

  13. GNX157 says:

    I am more familiar with the IAC stepper motor from around the 1980s and early 90s GM cars. On the IAC in the video, is the valve fully retracted and more pulse width extends it out? Could you explain more about how that valve works? Also, should the IAC valve be removed and the boar checked where the valve seals to see if that area needs cleaning? Which of those computer values would give an indication of let's say how much more reserve authority the IAC system has in a given condition at idle?

  14. mario perez says:

    Diagnose Dan is the best n you too .

  15. I think if you have low respect for life, then money or not, I think bad techs can exist..flat rate or not. Should not be a limiter. There is one guy on YouTube that brags about his auto business and is unable to understand how unprofessional he is. Hes always saying, "ok boys!" In one video he lets a customer pay him to try and reprogram a key fob for a chunk of money…he failed to let the customer know do to incompetence that any fob going through salt water(guy is in California) is not going to have any ability to have continuity. He knew the fob had this happen. But he went and charged the customer for $$ and then sent them to the dealer. The guy has a nice shop and tries to dress nice. But his mindset shows past this. In one video he gawks at 2 women who walk through the shop looking at things(for there car?) And first thing that comes to his mind is women and not shop/ customer safety. Insurance liability?? Some people go to school but its up to us to understand and acknowledge why we must take our duties seriously.

    A tech who does things correctly might be able to notice how 1000s of moving parts revolving together, generate an unseen frequency that ultimately brings something to life…if we do things fairly..we can selflessly find content in our work with no subconscious remorse or guilt that which can remove selfless content achieved without desire, only to promote life. There is a power in the refinement we take. True technicians are the unseen yet influence the world.. Ideal to take care. I live in Houston..I majored in Automotive technology, yet I refuse to work here since people get jealous easily and force you to do a quick job. You gain speed when your mind does the job again. Not by doing wrong. Thank you SD, for reminding people with your analytical mind that finds peace as you fix something and intelligence..It is a reflection of life being recognized.

    The video reflects wind transferring to a new leaf. Wish you peacefulness.. The presence in others lives is noticed even when you don't notice yourself.. This is old world power that still touches the internal existence of all. Similar to a mountains image.

    This goes to everyone who has integrity to understand how unseen life furthers because of our Choice to not fear lifes gentle presence in our work.. Ideal to take care.

  16. Excellent video im not a mechanic but i use to work on my cars as much i can and learn about real mechanics step by step thanks for this video and thanks to help others . im keep learning.

  17. Its the same everywhere only one in five are good at what they do. the rest are incompetent/criminal.

  18. Jesse Soto says:

    At the shop were i used to work they had a and sensors its a matter what..and if that fails.we sell an electrical problem..that way everything its covered

  19. Hello all
    Paul I would love a video with you diagnosing more then one car at a time, you keep saying some time you will do this.

    thank you

  20. Mad mechanic says:

    We are people.
    No one is righteous no not one, all have fallen short of the glory of God.

  21. Scott C says:

    I am Cornholio – I need more TP for my bung hole… 🙂

    Good video and a logical thought process.

    To answer the question – Are mechanics thieves, or incompetent? Does it matter if someone who is unqualified, gives an effort and fails to fix it? What about the thief who is just taking your money, without you getting anything in return? Isn't the end result the same, the customer has less money and still has a broken vehicle? You could make an argument that the thief left that person in better shape than the shop who tossed parts at it and damaged items in the process.

    As a veteran of almost 40 years, my question would be why is this still happening some 40 years later? It seems like the culpability lies in the same place it always has – consumers, lack of standards, the government job justification programs that masquerade as regulatory agencies, the manufacturers who get their franchised dealers to abide by an outdated method of reimbursement for warranty costs – which in turn trickle downstream.

  22. Jon Koontz says:

    Had to be a nissan

  23. Saint M says:

    The ones that are incompetent are thieves. In every business many experts lack functional knowledge and problem solving skills.

  24. Joseph1NJ says:

    As a small businessman I have a lot of compassion for today's mechanics/ techs. First, the freaking overhead is killer. It was never cheap, but compared to say 15/20 years ago… Anyway, customers have no way of understanding that. Next, look at the crap they're building today. It's a wonder how some designs make it out to production. Then unless you want to buy crap after market parts, which fail way to often, get ready to take out a small loan for OEM, and even then it's a crapshoot. So, you guys put with all of that, plus the goofy parts dude who sends you the wrong parts too many times, do the job right, and the customer bitches about the price. It sure ain't easy.

  25. Joseph1NJ says:

    Incompetence is theft.

  26. Yemi Asaolu says:

    If mechanics and technicians in developed countries that have to access to the most sophisticated diagnostics equipment in the world are still goofing and still in part changing syndrome then I personally feel they are plain lazy to get themselves educated in professional autodiagnotics .
    I practice and operate a shop in underdeveloped country (where access to basic means of life is difficult )and that doesn't stop me from getting the latest technical know- how from scannerdanner premium channel and latest professional equipment too ( autel maxisys and pico) and right I can boast of record of almost zero return job in the last 2 years of our shop operation with huge load of customers flooding our shop.
    I personally feel that diagnostics is a professional career and not for street urchins .

  27. Dylan Lewis says:

    I think it has a lot to do with where they work, whether it's a dealership or an independent shop. Dealers tend to pay very poorly for diagnostics, so it trains techs to change parts, because hey, at least they'll make some hours swapping parts. If you're all about diag, a good independent shop is where you want to be 9 times out of 10. A lot of us are trying the best we can, but at the end of the day, some can't afford to spend hours properly diagnosing a tricky problem if it only pays an hour. As they say, a fish rots from the head.

  28. It is all about money,time and greed

  29. alain mburas says:

    It is a known fact that almost all mechanics are thieves, and that is a fact anywhere on earth.

  30. Jason Lowder says:

    There's a lot of people in this field who are just…well, they don't have it. I've had weeks where if I were a parts changer I would've been wrong every single time because this one week EVERYTHING was a wiring issue with either broken and damaged wires or pins pushed out of connectors. Just taking the extra time the first time to do a visual inspection and simple circuit checks such as checking powers, grounds, shorting the signal wire to 5V ref and watching pids change can really make you not look like a dumbass. Everyone else in my shop needs help with the simplest tasks, can't diagnose anything, throw parts at everything and if there's no codes they don't know how to fix it and they really piss off the service manager, the advisors and the customers. I literally just got a raise and a guarantee this week because the service manager and the owner noticed that I get screwed because I go around and help everyone else and that takes time away from me. I'm super cereal, if it wasn't for me nothing would get out of that shop.

  31. A dirty or defective throttle body can cause no start issues. Seen it on 2008 Nissan altima.

  32. Wayne Penney says:

    the problem is if you want to be a carpenter you go buy a tape measure skill saw and a hammer and your a carpenter right? The same in this field. Anyone can go buy the 200 piece mechanics set and your a mechanic right? God help them if they have to read a wiring diagram some day.

  33. s30kidd says:

    This guys is so damn smart and thorough! Every tech should aspire to be like this

  34. I’m looking @ the hantek dso6074BE 4 channel automotive scope. Any thoughts, comments or concern with this choice?

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