In this video I conclude with our previous diagnose from this video : https://www.youtube.com/watch?v=34cNb8GJ5RA
Thanks for watching!

50 thoughts on “Toyota afr / 02 sensor problems: part ii”
  1. Avataaar/Circle Created with python_avatars wim0104 says:

    You've always been an excellent teacher, but I sure am glad you improved the "if I can do it, so can you." Da fu!?

  2. Avataaar/Circle Created with python_avatars mikembz1 says:

    Eric sir you mentioned in the first video that dealer replaced the catalytic converter did they re-installed the old ones after failed attempt to repair the vehicle thanks in advance.

  3. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Good to see it ran the drive cycle great update Eric O @SouthMainAutoRepairLLC

  4. Avataaar/Circle Created with python_avatars john martin says:

    Did it get repaired all the way? If it did I hope he is happy with the results

  5. Avataaar/Circle Created with python_avatars Timetryp says:

    A P0430 can be triggered by other factors impacting the cat, which still may be good.

  6. Avataaar/Circle Created with python_avatars Autumn Loving420 says:

    Thank you for helping me pass my 2002 Rav4 's inspection. I bought a couple of ebay denso that had to be knockoffs. Couldn't get it to run catalytist monitor for anything. Went to auto parts store, and after giving up approx $300, and a 10 mile drive, catalyst ready and no more shuttering or surging 🙂

  7. Avataaar/Circle Created with python_avatars Autumn Loving420 says:

    Same exact issue with my 2002 Rav4. Bank 1, Sensor 1 p1135 would just keep it stuck. Changed it out now it's stuck at p1130 code and a p1155. Before all of this I been having the P0420 and P0430 errors for a while. I don't know what to do though. I'm in North Jersey so inspection is so rediculous here

  8. Avataaar/Circle Created with python_avatars Sm Ms says:

    SWEEET VID 🚹 👍 👍 THANK U

  9. Avataaar/Circle Created with python_avatars Jake Elliott says:

    This video and the one it follows on from is pure gold, emmission/drive cycle problems can be a right f–cker to diagnose, this kinda puts into perspective the theory and knowledge, learned process and experience that is required to do this kind of work, kudos to you Eric O, you know your stuff and have a wealth of knowledge. Thanks.

  10. Avataaar/Circle Created with python_avatars The Music Lab says:

    Please help i have a p0420 on a 05 toyota 4runner but runs normal everything seems to be good
    Looks like is using more fuel than normal what could be the problem sensors or cat?

  11. Avataaar/Circle Created with python_avatars Mike Chiodetti says:

    GREAT DIAGNOSTIC JOB! Like you said, "All over but the crying!"

  12. Avataaar/Circle Created with python_avatars MIKE CONT says:

    Thanks for giving the conclusion. Great video

  13. Avataaar/Circle Created with python_avatars Duncan Mac says:

    Thanks for the video.

  14. Avataaar/Circle Created with python_avatars B rye says:

    in the first video you said he already had the cat replaced.

  15. Avataaar/Circle Created with python_avatars skipndance says:

    Thanks for this and the previous vid. They are great resources! I have a 2002 Toyota Rav4 which threw P0420 and P0430 codes a few days ago. I bought the car last summer. A few weeks later it started running rough and died with me in the middle of an intersection! Turned out it had a bad coil, but it took a while to diagnose because it didn't throw any codes. I bought aftermarket coils and learned a lesson about using non-OEM parts when it started misfiring 6 months later with a P0303 code. Finally got that sorted and now a few months later these codes are just one more thing to troubleshoot and fix, but like you, I don't like the idea of just throwing parts/money at it and hoping something works. I have an inexpensive OBD II scanner that showed under the P0420 code that the bank 1 sensor 1 failed. From everything I've read it appears to me that would be the upstream left A/F Sensor. I'm going to see if I can get it tested. I'm hoping and praying the cat isn't fried. I can't afford to replace the cat at the moment, so I'm hoping it's the A/F Sensor, but preparing myself if it's not. I'm glad I watched your videos all the way through and saw the part you took out was an O2 sensor! That was an excellent plot twist! 😀

  16. Avataaar/Circle Created with python_avatars Sm Ms says:

    GREAT VID FOLLOW UP 👍, GREAT TEACHINGS… SO MUCH FOR ME TO LEARN… THANK YOU

  17. Avataaar/Circle Created with python_avatars Mark Ash says:

    Thank you very much. I was hoping for this follow-up. Great job.

  18. Avataaar/Circle Created with python_avatars Bill Rimmer says:

    Can u make an 04 Dodge run the drive cycle quicker like u did the Toyota?

  19. Avataaar/Circle Created with python_avatars Steven McHenry says:

    Great job.

  20. Avataaar/Circle Created with python_avatars Preston West says:

    Is there a reason the Cat failed?

  21. Avataaar/Circle Created with python_avatars David Delio says:

    Lol your very good at this just like your brother who by the way is teaching me stuff so I can become a macanic just like you guys I noticed how good at your job you guys are and I look up to you

  22. Avataaar/Circle Created with python_avatars Hola! Camp Freedom VT says:

    Did you ever try the 2 anti fouler install on the rear O2 sensors? It worked for me on the last 7 vehicles i worked on. They had the 420 and or the 430 codes. Some people call it cheating or hacking,but i call it saving customers a lot of money. They all needed inspection stickers and most last at least a year with the foulers installed.

  23. Avataaar/Circle Created with python_avatars David West says:

    TSB for false CAT codes was published # of years ago; required ECU reflash to clear codes….

  24. Avataaar/Circle Created with python_avatars juan rodriguez says:

    now you broke it

  25. Avataaar/Circle Created with python_avatars Rockcycle Studio says:

    Eric I see Paul Danner gave you a thumbs up … both you guys are doing an Awesome job in your automotive Education Repair videos thanks to both of you …..talk about paying it forward ……..👍👍👍👍

  26. Avataaar/Circle Created with python_avatars Cleate Rose says:

    Hero Status!

  27. Avataaar/Circle Created with python_avatars harpnerd says:

    Great video segment. You are an excellent teacher. You have a way of "speaking from the trenches" that the average tech can relate to and understand.

  28. Avataaar/Circle Created with python_avatars rotoR Col says:

    I am confused It wasn't throwing MIL because it was not entering in drive cyclic mode? does it not suppose to throw a code for the air fuel sensor since It didn't complete it or enter into the drice cyclic? do you press a button in your scan tool to enter into check mode? thanks for the videos and awesome channel

  29. Avataaar/Circle Created with python_avatars Dan Of All Trades says:

    i have the same issue, what's left on my emission is oxygen sensors, i have upstream AF, brand new, i am curious about if volvo has a check mode, would you able to help with this?

  30. Avataaar/Circle Created with python_avatars Jeremy Anthony says:

    i think the tech at the toyota dealer missed something

  31. Avataaar/Circle Created with python_avatars jake ounce says:

    I got that P0420 code on my 2000 4Runner, and dropped the CAT to clean him! Code went away and started using Shell gas in him.

  32. Avataaar/Circle Created with python_avatars Lorenzo Arroz says:

    You have the heart of a curious and patient man. i really enjoyed your detective work. A logical deduction Doctor Watson. A+ for the Video.

  33. Avataaar/Circle Created with python_avatars molsky13 says:

    Eric i dont think we could fix this one

  34. Avataaar/Circle Created with python_avatars hunkydude322 says:

    i   noticed some shops give up and then the customer or shop comes and sees you, and you approach it in a sensible way, u dont panic etc..  u have a sense of directions, and eventually pinpoint the culprid.  i think maybe lots of auto technicians dont have that sense of approach, and lackin  patient, anyways   great video as always.

  35. Avataaar/Circle Created with python_avatars Kevin Weaver says:

    Awesome Fix. You Rock.

  36. Avataaar/Circle Created with python_avatars Tedybear315 says:

    Amazing that a dealership with all the interface tools and knowledge at their fingertips would make such a mistake.  Just proves everyone is human.  How did they bill out a replacement PCM with labor to this guy?  Hope they didn't hose him over to bad.

  37. Avataaar/Circle Created with python_avatars HUBBABUBBA DOOPYDOOP says:

    Of course the cat is poisoned- because that "regular" O2 sensor has been dumping so much raw fuel in there. That was a great diagnosis!

    May I suggest- that in the future- trying plain Propane as an "enricher" for stuff like this will be better. Rig yourself a nozzle with a torch valve & a rubber hose with a metal or nylon tip for connecting to a vacuum line. It will make a smoother transition- without stalling the engine. It's probably way cheaper, too.

  38. Avataaar/Circle Created with python_avatars Bill Rimmer says:

    Watched both videos. In fact I went back and watched them twice. It's nice now u r still able to answer. Would love to c u and the Danner brothers get together. Had the same problem with a Toyota 4 cyl. The connectors matched and everything. So cool u checked the part #. Soon u will have a bazillion subscribers and won't b able to answer as much. I use WD-40 a lot and love it. Do u guys have it out there? I also have a cheap scanner. I don't think I would have been able to discern the problem. Looking forward to u using the Actron. Thank u very much for your excellent teaching. And as good as u r, ur still humble! WOW!!

  39. Avataaar/Circle Created with python_avatars Maic Salazar Diagnostics says:

    I watch the first video and in that one you said that the costumer did replace the CATs! So?

  40. Avataaar/Circle Created with python_avatars ScannerDanner says:

    Nice job brother and this is the way it goes. A cat monitor cannot complete with a faulty O2 of AF sensor. Communication is key as you also covered. I didn't see part 1, I'm sure it is good too.
    To my people, you guys need to check this guy out. He is the real deal.

  41. Avataaar/Circle Created with python_avatars halleffect1 says:

    great work there.  seems auto repair has multiple challenges.  now to eloquently explain to the customer that you fixed the original problem while uncovering more costly ones.  with the dishonest shops out there generating un-trusting customers, this can be as hard as the diagnostics.

  42. Avataaar/Circle Created with python_avatars Rakatawhat says:

    Enjoyed watching the 2 videos.

    It's the first time hearing about AFR sensors. I'd would've confused them for an O2 sensors.
    Only Toyota's uses AFR sensors?

    (That O2 sensor socket is nice)

  43. Avataaar/Circle Created with python_avatars cbobcbob100 says:

    thanks….one of the best videos on afr sensor I have seen…..bob

  44. Avataaar/Circle Created with python_avatars hjs3rd says:

    Didn't you mention in the 1st video @ 0.29 seconds the catalytic converter had been replaced?