Question about 2000 Nissan Maxima

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P0171B Hi I have a 2000 Maxima and would greatly appreciate if someone knows what the code P0171B (Bank#1 System too lean) means....

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It means that your engine is running lean - not getting enough fuel for the amount of air that the engine is receiving. Because your maxima is equipped with a V-6 engine, whatever the problem, it is affecting only bank #1. Bank #1 is always the side of the engine where cylinder #1 is located, or in your case, the left side of the engine as it is viewed while facing the crankshaft end of the engine.
(on a 4 cylinder engine, there is only one bank and it is always referred to as Bank #1)
There are several things that can cause a lean condition including vacuum leaks, a malfunctioning Evaporative Emissions system, a misfiring cylinder (due to bad plugs, bad injectors, or an intake or head gasket leak.), a malfunctioning Mass Airflow sensor (MAF) or Manifold Absolute Pressure sensor (MAP) or even a bad Oxygen sensor (O2s) (Nissan sometimes calls an O2s an "Air-Fuel Ratio Sensor") It is even possible for a leaking vacuum brake booster to cause a lean code.
If there are any other malfunction codes present, it may help to pinpiont the cause of the lean code. (Like a P0301 "cylinder#1 misfire detected", in which case, you would address the misfire code first.)
Certain problems, like a leaking brake booster or a bad MAF will usually set lean codes for BOTH banks.
If the P0171 is the ONLY code present, the most likely cause is a bad O2s, but I recommend some diagnostic testing to prove it before spending the mega-bucks that Nissan gets for their O2 sensors.

Posted on Oct 10, 2009

  • cthomas66664 Oct 08, 2010

    what if your problem is same as above but there is no code at all concerning lean on bank one and bank two

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Hi my name is nizam , i have 199 nissan maxima i just change 02 sensors than come up po171 what is the problem

Posted on Jan 15, 2010

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Hi, I have, 2001 Nissan Maxima. Get check engine lite. Car now has 60k miles. Local mechanic had already replaced two O2 sensors 9 months ago. I don't know what the codes were at that time. Check Engine...


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Hi my nissan maxima has problem


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The possible problem maybe:
The fuel pump not puting out enough pressure.
The fuel filter maybe clogged
The fuel injector maybe clogged or needs to be cleaned.

Were there anymore trouble codes besides the two from Autozone?

Apr 15, 2009 | 2000 Nissan Maxima

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