Question about GMC Envoy XL
P0171 - Bank 1 system too lean.
P1133 - O2S insufficient switching bank 1 sensor 1
Posted on Oct 22, 2013
Testimonial: "Thank you but how do I fix the problem?"
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
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
Tips for a great answer:
Oct 22, 2013 | GMC Envoy XL Cars & Trucks
Oct 22, 2013 | GMC Cars & Trucks
Jun 24, 2012 | Chevrolet Colorado Cars & Trucks
Apr 22, 2011 | 1999 Lexus ES 300
Feb 13, 2010 | 2000 Saturn SW2
Oct 08, 2009 | 1997 Saturn SL
Jul 24, 2009 | Chevrolet Blazer Cars & Trucks
Apr 20, 2009 | 1998 GMC Sonoma
138 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: