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 www.scannerdanner.com 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 https://www.scannerdanner.com/join-scannerdanner-premium.html 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!
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