Basically you’re running lean on both banks

Possible culprits (most to least likely):

- Vacuum leak. Check your vacuum lines to see if any have slipped off, or if any have cracked. You may be able to hear the leak, but possibly not... there are a lot of vacuum lines on modern automobiles...

- Bad fuel pressure regulator or weak fuel pump. Need to check your pressure on the fuel rail to diagnose. Need a fuel pressure gauge to test.

- Clogged fuel filter. Possible, but less likely.

- Clogged fuel injectors. Less likely, but possible.

In response to this post by Brown Water

Posted: 03/18/2018 at 8:29PM

Gearheads, P0171, Powertrain too lean code. What's your diagnosis? ** -- Brown Water 03/18/2018 6:39PM

German ** -- MEHOKIE 03/19/2018 06:58AM

Could be lots. Need more info. -- 48zip 03/18/2018 10:23PM

MAF sensor. Take off your intake plumbing from the air filter to the -- vt_mughal 03/18/2018 9:00PM

I agree that this is a good thing to try because it's cheap... -- MP4VT2004 03/18/2018 9:35PM

It’s not a clogged MAF restricting AF, it’s a dirty... -- No1Hokie 03/19/2018 07:39AM

Seems logical. But its $5, and 30 mintues. We could spend 30 minutes -- vt_mughal 03/18/2018 9:43PM

I won't argue that! -- MP4VT2004 03/18/2018 11:36PM

This is such a fitting DTC for you, BW. (too lean) -- MP4VT2004 03/18/2018 8:15PM

Fetzer valve or bypass line. You’ll need ball bearings & some 3-in-1 oil. ** -- Spud 03/18/2018 7:52PM

And antifreeze, preferably Prestone. No, make that Quaker State. ** -- RoswellGAHokie 03/18/2018 8:01PM

...My old man is a television repairman...I can fix it ** -- chumley 03/18/2018 7:59PM

Clean your MAF sensor... cheap and easy. -- No1Hokie 03/18/2018 7:37PM

Probably a vacuum leak -- Betabeachbum 03/18/2018 7:02PM

I have the P0174 code too, which I guess is bank 2 ** -- Brown Water 03/18/2018 7:19PM

Given problem in on both banks, my money is on vacuum leak ** -- Pylons 03/19/2018 11:30AM

Basically you’re running lean on both banks -- EDGEMAN 03/18/2018 8:29PM

That would definitely give you a lean condition. ** -- EDGEMAN 03/18/2018 7:07PM

What are your fuel trim numbers? -- EDGEMAN 03/18/2018 7:02PM

No earthly idea ** -- Brown Water 03/18/2018 7:03PM

Basically you’re running lean on both banks

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