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

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[@growrich9881]

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

[@easyautofix]

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[@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.

[@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

[@ALIBEYEL]

Thank you brother

[@easyautofix]

and thank you!

[@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?

[@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

[@HarlemhitPrudholme]

So its the throttle body need replace

[@matijamolan3833]

What when code says sistem too fat? Any advice?

[@ManuelAdolfoEncinasOcejo]

Puede ser un inyector "abierto"

[@danemaddalena9674]

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

[@teecoupe]

🏁🚗💨

[@nebs1212]

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

[@waqasfamilyvlogs]

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