First of all - thank you to everyone who commented on the P0171 threads throughout this forum! I would love to go back and "like" each suggesting I ran across. But, they are way too numerous to even begin to accomplish that. I do want to circle back here and, hopefully, help anyone encountering this error for the first time. Scenario: - 2011 - 140k miles - always serviced appropriately - the only "out of ordinary" things I've ever done to the car is a front wheel bearing and an accessory battery. Somewhere about 140k, the check engine light appeared. Everything seemed to be running ok. I had noticed a reduction in fuel economy over the years, but I chalked that up to age. So, I got my phone and obdii adapter out. That's when I found the P0171. I tried every "easy" thing I could find in these forums: - replace PCV (just cause it is easy and cheap) - cleaned MAF as best I could without total disassembly - checked all hoses - replaced spark plugs - and on and on - really, about the only thing I didn't do was replace the O2s and take apart/clean the manifold So, left with (seemingly) no other option, I was able to find a fuel pump from a wrecked 2012 with 60k on ebay. The fuel pump on the 2011s vs 2012s had a very similar but not identical fuel pump assembly. My 2011 had a part number of 7702047080 and the 2012 had a 7702047081 part number. That did it! After clearing the code and driving a few 100 miles, even the "permanent" P0171 went away. A note on the fuel pump part numbers. The 7702047081 assembly is a direct replacement for my previous 7702047080 assembly. That is NOT true for the components attached to the assembly. The 2012 assembly I bought came damaged (looked like they just chopped it out of the previous car). So, I had to move the components from the new assembly housing to my old assembly. That was super easy, but I noticed that the pump itself has a different electrical connection and the fuel level potentiometer was slightly different. SO, if you are looking for a new fuel pump be careful about buying just the pump separate from the entire assembly. So, thanks again everyone.
