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  #1 (permalink)  
Old 09-14-2006, 12:10 PM
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Default 2001 maxima code P0171

hi me again,i still geting code P0171 i cleaned the mass air sensor.with scs mass air sensor cleener and it runs like a banshie faster then when i got it from my friend.still coding the same this time i left tester in will driveing and when it got to the 02 moniter it sent code pending.witch leads me to beleve its the bank 1 o2 sensor.how do i know witch is the bank 1 02 sensor.code book said system to lean bank 1.any help would be cool
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Old 09-14-2006, 01:30 PM
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Hello

DTC P0171 (BANK 1), P0174 (BANK 2) FUEL INJECTION SYSTEM FUNCTION
(LEAN)

Possible Cause:
- Intake air leaks
- Heated oxygen sensor 1 (front)
- Injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor

You can find the location of the O2 sensor in this document:


http://www.nissanhelp.com/Ownership/...TIFICATION.htm
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Old 09-15-2006, 12:36 PM
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i went to nissan dealer they said that its running in all the paramiters said its fine when i asked about the code and ses light being on . i on got a i dont know everything is fine.
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Old 09-17-2006, 05:59 PM
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I had this code. The meaning of this code is that one of yours oxygen sensors doesn't work. It's not big deal to replace it. Be careful to do it while engine cold. Oxygen sensor price is about ~100$.
Have a good luck.
Micheal
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Old 10-04-2006, 06:28 PM
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Default Po171 & Po174

This means both banks are running lean. I tried cleaning MAFS, but it did not work. You need to replace MAFS, clean out air box, and new Nissan air filter. You may also need to have computer reprogramed for sensor.
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Old 10-07-2006, 01:11 PM
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There is an updated airflow meter for this vehicle part #22680-2y001. Replace it and have the ecm reprogrammed.The new sensor requires different programming to operate correctly.
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Old 03-23-2007, 06:05 PM
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why does the ecm need to be re-programed?
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Old 03-24-2007, 03:13 AM
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The new sensor requires different programming to operate correctly.
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Old 03-24-2007, 03:04 PM
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How does the ecm know that. I can understand that you have to clear out the codes, but why does a dealer have to re program the ecm.
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Old 03-24-2007, 04:17 PM
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They have changed the sensor. Basically by reprogramming the ecm you are telling it that you have installed an updated air flow meter. Think of it kind of like your computer at home. If you install a dvd burner you have to install software for it to operate properly. It will work to read cds without the software but if you want to use it for it's designed purpose you have to update your computer so it knows what to do with it.
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Old 03-25-2007, 04:41 PM
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well OK, but I still think that it is a costly thing that only a dealer can do.
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Old 08-08-2008, 05:19 PM
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Default P0171 Code

Hi. I am having the same problem except this code keeps showing. I have changed 2 02 sensors plus some transmission sensor... when I plug my scanner in I also get a I/M status with everything ok except Catalyst and Evap system. Is there some thing you can suggest as I have changed gas cap aswell. Thx
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Old 06-23-2012, 03:17 PM
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Default More O2 problems

I have a 2001 Maxima Se. The check engine light has come on and off for a couple years. The first time the mechanic replaced the ignition coils. Took about 100 miles for the light to go off. It came back on about a month later. This time it was the Air Mass meter. The light came on a few months later. I waited until inspection time, and this time I needed the entire catalytic converter assembly replaced. It's back on again. I'm getting code P0171. Which I know is bank 1 O2 sensor. It doesn't make sense that all these things keep needing replacement so soon after something is replaced. Is it normal to have such a train reaction? I totally trust my mechanic, and I only have 95K mi on the car.
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Old 06-23-2012, 03:19 PM
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I had meant this to be at the start of the forum.
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