P0171 Trouble Code: System Too Lean Bank 1 (The Most Common Causes)

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⚠ DISCLAIMER: Any information provided in this video is intended to educate viewers on how to repair cars. EasyAutoFix shall not be liable under any circumstances in case of any injury, damage, or other accident. By watching this video, you agree to comply with the disclaimer. Some links in this description may be affiliate links, meaning EasyAutoFix earns money from qualifying purchases.

[@growrich9881]

You provide so much value for free, it’s insane. Thank you man!

[@easyautofix]

I appreciate you!

[@factotumted]

Great information. Thanks!! The cause on my 2004 Honda CR-V was a bad intake manifold gasket!!! Took forever to diagnosis it.

[@easyautofix]

Thank you for sharing!

[@TheDavidCoppafeel]

Same on my 2007 Element. What a rabbit hole of diagnosis, until I saw this video.

[@ALIBEYEL]

Thank you brother

[@easyautofix]

and thank you!

[@hakeemboyd4910]

Getting a Chevy sonic for a cheap price and after scanning it I saw those popped up but contemplating if to still go ahead or save my money

[@PlanB-3751]

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[@omnizen]

Vehicle in question is a 2003 VW Passat GLX, 6 cylinder, automatic transmission, front wheel drive. This vehicle has always had a seemingly high idle speed, even when it comes back from service at the Dealership.
I am getting P0171 and P0174 for the same "too lean" condition on both right and left banks. If idle speed was set too low (on last service at an auto repair center), what do you think the chances are this might be the cause?
RANDOM QUESTIONS:
Does the ECM control the idle speed and the mechanic cannot adjust it?
Could a low idle speed cause the ECM to calculate and inject the wrong amount of gas because the ECM is programmed to function as though the idle speed is set correctly?
If the ECM knows the mix is lean, why does the ECM not adjust the mix accordingly by increasing the fuel injection interval?
Could it be the idle speed has been running low . . . BECAUSE OF A VACUUM LEAK, . . . and the engine therefore has insufficient power to maintain the correct idle speed because of the weak fuel mix?

[@gbowers]

I’ve got this code on my 2006 Camry with 280k miles and I’ve noticed I also have a 16% absolute throttle position during idle when looking at the live data on my BlueDriver which I’m pretty sure is way too high. Would this most likely indicate it’s the throttle position sensor that needs replaced? The absolute throttle position percentage when the code last got tripped on the freeze frame data was 30.6%.

[@DaveSam07]

I had both codes right after I ran out of fuel while driving
Engine was rattling on first start then goes well but the engine still stumble at 4000rpm rev

[@JGG1701]

P0171 ONLY on my 2020 Ford F150. I have only 26,000 miles on it. I saw your possible reasons. I have extended warranty but my dealership doesn't do 3rd party warranties.
Now what would you recommend sir?
EDIT:
I bought the truck brand new. This shouldn't happen so soon should it?

[@wolleyreikivalley]

what if you get this right after getting gas on a super hot day (100°) and you clear it and it doesn’t come back

[@ltetobago]

My question too after 99deg today

[@sooflex15]

It’s way to many things that could be wrong

[@HarlemhitPrudholme]

So its the throttle body need replace

[@SamuelSantana-yv7dj]

my car is ticking on warm ups but not when hot can u help with some info so i can take care of it

[@jamesgoodman80]

Could be an exhaust manifold leak. When the metal warms up it seals itself. Depends what kind of tick though if its internals related or not

[@68taco]

I know nothing about pop1 code 171,I asked my neighbor and he said I need a vacuum brake booster,but he also said he didn't know if that 02 is damaged,I'm a military wife I took it to three mechanic and each one said something different with outrageous prices ,I trust my neighbor advice he said I should only get the vacuum brake booster to see if that takes care of the problem ,what do u think 🤔

[@christianjimenez3172]

If your brake booster is bad you will have inconsistent braking as well as “system too lean” I fixed my problem by replacing brake booster

[@danemaddalena9674]

I have a 01 Ford expedition I just want a new computer n wiring harness or just get a carburetor 302

[@matijamolan3833]

What when code says sistem too fat? Any advice?

[@ManuelAdolfoEncinasOcejo]

Puede ser un inyector "abierto"

[@nebs1212]

My car is hesitating like it’s not getting enough air or gas

[@teecoupe]

🏁🚗💨

[@user-yd5vb4wp6n]

I also got p0420 with the code

[@alexlsx8187]

Oxygen sensor !

[@davidkalger]

Me too,any ideas

[@alexlsx8187]

@@davidkalger it’s the oxygen sensor

[@waqasfamilyvlogs]

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