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Trouble Codes P0171 & P0174

Old 02-13-2019, 09:37 AM
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Trouble Codes P0171 & P0174

Hey all, I'm getting P0171 and P0174 codes thrown on my 2011 with 150k miles on it. I've searched the forum and am not finding any information here. I have googled a lot and have found a lot of information but nothing specific to a 7th gen Maxima.

P0171 is a lean Bank 1 condition and P0174 is a lean Bank 2 condition. Does anyone have any ideas other than O2 sensors. I've had tried two different MAF sensors, the original OEM and an aftermarket sensor. I bought the aftermarket sensor when I was having a P0101 code but it turned out I needed to have the firmware flashed.

I would like to rule out the MAF, but I'm not 100% certain I can at this point. Has anyone had experiece with these codes?

Thanks much!
okubricko is offline  
Old 02-13-2019, 10:37 AM
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Join Date: Mar 2009
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Could it well be a vacuum leak somewhere making the A/F mixture lean. I would look carefully in the engine bay while someone revs the engine few times. O2 sensors going out would be the next step if vacuum leaks are negative. Are you sure off the clamps around the throttle body are tightly secured?
Please report back.
mahanddeem is offline  
Old 02-13-2019, 10:47 AM
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mahanddem, I'll take a look tonight when I get home and get back.
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Old 02-13-2019, 08:35 PM
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Perhaps you're getting unmeasured air from somewhere post MAF. O2 sensors would throw their own concurrent codes were they they faulty, would they not? PCV and brake booster are the only vacuum sources you need to check at rear of intake manifold. The breather from bank 2 valve cover to resonator being the only other source. Check connections to all. Replace bank 1 PCV while you're back there. I think I got my OEM valve on ebay for like, 20 bucks or something. Are you running hotter than normal? Fans running more often? Any idea what your fuel pressure looks like?
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