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In this video we repair a previously diagnosed P0171 in a 2007 Hyundai Sonata 3.3 V-6 and then we verify the repair.
Please refer to your shop manual for the proper repair procedures on your vehicle.
PART #1 https://www.youtube.com/watch?v=E9IAg-Ihvx8&list=UUtAGzm9e_liY7ko1PBhzTHA

47 thoughts on “Hyundai sonata p0171 part ii”
  1. Avataaar/Circle Created with python_avatars Tony Vision says:

    I got the same car they are saying that there is to much “unregulated air” getting in. Good smoke test. I put a new Maf, injectors, o2 sensors, coil packs, throttle body sensor, egr valve switch etc same issue. Any ideas?

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

    Good Repair Eric O first video took ages to get the o2 to wake up very slow to respond I think the O2 Sensor Heater went open circuit and he was Intermediate @SouthMainAutoRepairLLC

  3. Avataaar/Circle Created with python_avatars William Kennard says:

    Talkin about in this video how you only had less than 1000 subscribers…. Look at you now my boi😭😭💯👌🏻

  4. Avataaar/Circle Created with python_avatars Ricky The tech guy says:

    I always enjoy your videos

  5. Avataaar/Circle Created with python_avatars Good Arkie says:

    I have a mazda 3 with intermittent check engine code p0171. I wish I could get you to look at it half the country away.

  6. Avataaar/Circle Created with python_avatars Hayden Martin says:

    How did you replace the 02 sensor

  7. Avataaar/Circle Created with python_avatars Russell Booth says:

    I would've been expecting a P0135 code or something if the heater element was open circuit !

  8. Avataaar/Circle Created with python_avatars tyler krug says:

    I love these videos!

  9. Avataaar/Circle Created with python_avatars Puder McGavin says:

    The fuel trim is cutting back to compensate for the long term trim being high for so long

  10. Avataaar/Circle Created with python_avatars Dodge Free says:

    "Self Made Auto" Dude, there is nobody 200 miles dead south of you capable of doing this level of diagnosis. They can only put on new parts while guessing. Caused me to junk a rich running Camry that couldn't be repaired. Keep up the good work. Great channel.

  11. Avataaar/Circle Created with python_avatars Corbett Knowles says:

    I was thinking about that O2 heater when I washed first video but I clicked on the part 2 and never got a chance to comment on it

  12. Avataaar/Circle Created with python_avatars Mike Selsvik says:

    If the o2 caused a lean condition mabe the no start was a lack of fuel in the cold weather

  13. Avataaar/Circle Created with python_avatars Josh Winky says:

    HOLY SMOKES! 1,000 subs!!!!

    How life has changed for the Fantastic Mr. O in 3 short years 🙂

  14. Avataaar/Circle Created with python_avatars Tim Sullivan Jr says:

    We have a 06 sonata. Would not start on Monday. Got it started Monday afternoon. Check engine light came on yesterday. Hooked my obd scanner up and got 2 codes p0171 and p0174. Now car won't start again. What could it possibly be

  15. Avataaar/Circle Created with python_avatars John McKamy says:

    dang that's cold as bleep,   don't think I could get used to that.

  16. Avataaar/Circle Created with python_avatars Sam Rugtiv says:

    very good you are sharp .

  17. Avataaar/Circle Created with python_avatars Sam Rugtiv says:

    how much is that snap on scanner I worked a drb three for years buy otc.also a good scanner dodge

  18. Avataaar/Circle Created with python_avatars Sam Rugtiv says:

    check the thermostat

  19. Avataaar/Circle Created with python_avatars Sam Rugtiv says:

    long crank time may still need a fuel pump

  20. Avataaar/Circle Created with python_avatars Leonardo Wilhelm says:

    I am from Brazil and around here this car is called 'Azera'. Same 3.3L V6 engine. We also have the 'Sonata', but it's engine configuration is different (2.4L 4cc). Great video, by the way! I'm having the same issue on my 2011 Azera. Already changed the faulty O2 Sensor, but it's still with the 'Check Engine Light' on. The strange thing is that the car has never had a malfunction, always ran great. Dunno where to look anymore. Anyhow, that strange crank noise comes from the chain tension of the CVVT system.

  21. Avataaar/Circle Created with python_avatars Luis Baez says:

    good video the reason fuel trim are negative is cuz the memory of the long term fuel trim that was positive trying make the old o2 sensor to work. i use fuel trim to verified any fix related to lean condition

  22. Avataaar/Circle Created with python_avatars Robert Davis says:

    Another enjoyable lesson. Any more?

  23. Avataaar/Circle Created with python_avatars rhkips says:

    As the B1S1 STFT suddenly went way negative again, notice the engine RPM had dropped from ~2100 to ~1600; it just switched into a different map cell where the LTFT hadn't started relearning yet. Perfectly normal. 🙂

  24. Avataaar/Circle Created with python_avatars Geo Jor says:

    always enjoyable…

  25. Avataaar/Circle Created with python_avatars Cobra Ninety Six says:

    Great demonstration on 02 sensor diagnosis! What would you recommend to the DIY'er for an affordable scan tool and smoke machine? Thanks, Chuck

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

    Wouldn't open o/2 heater set an immediate code? Scanner Danner would know. U guys r going to have to get together. My two favorites. When u light the hot wrench and hit the impact, he would respond with. "Is that electric impact ground side switch and what's the duty cycle on that torch?"

  27. Avataaar/Circle Created with python_avatars treydaypnw says:

    Dang -22 Degrees! And I thought it was Cold here in Seattle. Hey quick Question I'm going to School to Work on Cars in the Fall of this year. And my goal is to one day open my own Shop, mainly to be my own Boss. My question is, as far as clientele and business goes, is it better to be in a State where the Weather is Cold?

  28. Avataaar/Circle Created with python_avatars Terry Beharry says:

    Could you not have tested the heater circuit on your scope… just curious….? Hyundai Accent 203 had a misfire at idle but was fine at over 1200 – 1500 hundred RPM no misfire… had a hell of a hard time finding what causing this misfire…. could not find it , I try everything possible to find this misfire…. So messing around with this car in frustration, I accidently broke the oxygen sensor  messing with it, So had no choice, I changed it out,  had one laying around, a used one, so I install it, the next thing all of a sudden the misfire disappear… So please you tell me ,, this car did not show up  any trouble codes.. 

  29. Avataaar/Circle Created with python_avatars Robert Young says:

    Eric
    I would have liked to have seen the long term fuel trim before and after the fix.
    Thank you for your videos
    R.G.Young

  30. Avataaar/Circle Created with python_avatars Texas Pipeliner says:

    Faulty O2 sensor established a high + LTFT-B1, so when new O2 sensor was installed, a storng negative STFT-B1 would be expected to bring LTFT-B1 to near zero, which happened.  

    Do you have any experience to suggest that absence of B1 O2 sensor heater code is possible  w/ a heater fault?

    Enjoy your videos!

  31. Avataaar/Circle Created with python_avatars Michael Herbert says:

    I love this channel. Its like getting extra practice without my boss breathing down my neck telling me to hurry up.

  32. Avataaar/Circle Created with python_avatars Dan.vaku says:

    I'm thinking it might be due for a tune up with the plugs and wire/coil boots. The cold start sequence sprays a lot of fuel, and weak spark will have a hard time igniting the rich mixture. Not to mention a lot of times those rear plugs and other stuff underneath the manifold will not be touched since the car left the assembly line.

  33. Avataaar/Circle Created with python_avatars Thomas EXOVCDS says:

    Had a Mazda MPV a while back that had a big vacuum leak… after the repair I watched the fuel trims. It too had a momentary "rich" spike during the "relearn". I think that the ecm does a recheck if you will… it had lean in memory, but now is seeing rich, so it takes away fuel but decides to add fuel again to see what the front O2 does. Once it saw that the front O2 went back to rich, it knew that it could ignore the old learned fuel map.

    Hope that made sense… at least that's what made sense to me at the time. 🙂

  34. Avataaar/Circle Created with python_avatars George Heri says:

    That fuel trim being negative was bringing the long term fuel trim back toward zero. looks like a good fix. That long crank on a Hyundai you might want to look at the crank sensor. it can be putting a totally ragged signal out and the car will run but not correctly. Kia same way. Hard start intermittent miss. sometimes it runs great. Just an observation from past experience.  Thanks for the good video.-22 not good.

  35. Avataaar/Circle Created with python_avatars j georges says:

    hey ERIC, cranking and starting had nothing to do with O2as you know but the way I, thing is that stft is fuel flow adjustment in respond to the O2 input during closed lope operation and ltft is fuel flow adjustment determined by the PCM. thanks for sharing and good info as always.

  36. Avataaar/Circle Created with python_avatars absalon9833learnmore says:

    You have a great community going here man. I will put my 2 cents in, I remember that the car was missing at one time, I believe you have bad plugs specially on the bank that had the bad O2 sensor because of the fact that they were getting too much fuel intermittently!!! And again thanks for sharing.

  37. Avataaar/Circle Created with python_avatars wtbm123 says:

    Interesting to see how it starts with fuel trims normal . Even if customer said stop , and it was out side my place in morning I would still start it ,with scan tool hooked up looking . Does it have a fuel test port easy to hook to .any crud in throttle body , does it have a iac , Now you see y i seem to loose money sometimes lol 

  38. Avataaar/Circle Created with python_avatars wysetech2000 says:

    Looks like you hit the nail on the head with the O2 sensor replacement. It was probably getting ready to fail completely. The suspense is gonna kill me waiting for the cold start results tomorrow. LoL. Did you check the condition of the spark plugs and other ignition components? I have had three crank, no starts lately that I found were just badly flooded and wouldn't fire due to badly worn out plugs.