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
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
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?
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
Talkin about in this video how you only had less than 1000 subscribers…. Look at you now my boi😭😭💯👌🏻
I always enjoy your videos
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.
How did you replace the 02 sensor
I would've been expecting a P0135 code or something if the heater element was open circuit !
I love these videos!
The fuel trim is cutting back to compensate for the long term trim being high for so long
"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.
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
If the o2 caused a lean condition mabe the no start was a lack of fuel in the cold weather
HOLY SMOKES! 1,000 subs!!!!
How life has changed for the Fantastic Mr. O in 3 short years 🙂
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
dang that's cold as bleep, don't think I could get used to that.
very good you are sharp .
how much is that snap on scanner I worked a drb three for years buy otc.also a good scanner dodge
check the thermostat
long crank time may still need a fuel pump
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.
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
Another enjoyable lesson. Any more?
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. 🙂
always enjoyable…
Great demonstration on 02 sensor diagnosis! What would you recommend to the DIY'er for an affordable scan tool and smoke machine? Thanks, Chuck
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?"
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?
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..
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
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!
I love this channel. Its like getting extra practice without my boss breathing down my neck telling me to hurry up.
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.
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. 🙂
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.
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.
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.
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
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.
if you would have looked at the LT fuel trim it would probably would have been around + 24 when the ST was at -24 and your total FT would have been 0
you are incorrect nick the job of the ST fuel trim is to keep the engine running at stoichiometric the job of the LT fuel trim is to keep the ST at 0
Not sure if the long cranking is because of the weather. I live in Alberta and cars start right up on colds days. The engine cranks slower but starts right away..
Duplication of the complaint has always been an issue. I try to make my customers aware of that, especially if they are having intermittent issues. You fixed A problem, but not THE problem. As long as the customer is aware that you are not a magician, the door is open to find the issue, if it presents itself again.
good work you a fan of hyundai?
Mr Brown had it right. I could use the practice Eric so hows about next time you let us brainstorm the diagnosis before you tell us the fix. This online automotive course you have is right up my alley – a little too short tonight I have lots of pupcorn left and barely finished a beer. Well done 👍
Eric when checking fuel trim after repair put up stft an ltft at the same time if ltft is hi stft should be low. ltft is in memory for period of time
The Short fuel trim was negative after replacing the O2 because its main purpose is to keep the Long Fuel Trim as close to 0 as possible. Remember how positive the Short Trim was before? It's adjusting it now that the O2 is giving correct readings. That of course if you didn't erase the computer's memory…
Open circuit O2 heater would set a code instantly on startup for sure on a 2007…Unless Hyundai didn't program that in? Only one way to find out…unplug it and read the codes!