Have a p0171 on a 2001 maxima..Tried a new MAF..same thing. Checked all vacuum lines and hoses but all appear fine. Any more suggestions? Been working on this for a week.

 

You need a new OEM Genuine Nissan parts

 

I used an good/working OEM maf from another maxima...same code...I purchased a new one from the dealer..but i'm pretty sure it is something else...

 

It has a brand new supposedly OEM Hitachi Throttle body with a cheap sticker that says "made in japan - abv0039"

http://www.ebay.com/itm/Idle-Air-Control-Valve-HITACHI-ABV0039-fits-00-01-Infiniti-I30-3-0L-V6-/400699382892?pt=Motors_Car_Truck_Parts_Accessories&hash=item5d4b8b5c6c&vxp=mtr
If the NEW OEM MAF doesn't work.. I'm going to buy an OEM IACV from the dealer....something looks funny about this "OEM Hitachi" iacv..will keep updating this post as I try these things.

So far:

1) Changed catalytic converter + a new 02 sensor (cat code went away..p0171 still there)
2) Swapped in a good oem maf from another car....code still pops up (no code on the other car though)
3) Double/Triple checked all lines and hoses...

will do

1) Try a new OEM maf
2) Try a new OEM IACV directly from the dealer.

 

Tried New MAF today...same code..

waiting for the new Oem iacv to try

 

Problem solved..It was the upper intake manifold gasket. Gasket was flattened and a part was being sucked in. I sprayed carb cleaner around it a few times before with no results, however, I had a feeling to change it.

 

Thanks for reporting back with the solution.

 

is this a for sure fix, or did you just barely fix it?