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This is the code I am getting on my 97 from an auto parts store. The big suggestion is to replace the Mas Airflow sensor but then a worker cautioned because there are many reasons why I could get a Lean message (on Bank 1). I replaced the MAS Airflow sensor 2 years ago with one that had a 1 year warranty. It looks very clean, but what is with those little wires on it like an old light bulb? Could they be broken? I can switch that sensor, or I can take it in for troubleshooting. I am not mechanical, just have a thunderbird and can only do minimal work myself
 

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I always start like this:

Open google, and type "p0171 code site:tccoa.com" witout the quotes in the search box.

This is the first page:

About 101 results (0.25 seconds)

Code P0171 and P0174 - TCCoA Forums
forums.tccoa.com/6-general-tech/326-code-p0171-p0174.html
Jul 18, 2002 - 5 posts - ‎4 authors

I have a 94 Courgar with a 4.6 and had the check engine light come on. I pulled the codes and Po171 and P0174 came up which are system to ...
Codes P0171 & P0174 - TCCoA Forums
forums.tccoa.com/7-engine-4-6l-5-4l/100466-codes-p0171-p0174.html
May 23, 2007 - 14 posts - ‎8 authors

Just a little confused. Went to Autozone to get a check engine light read and the two codes returned were P0171 & P0174. The guy suggested I.
P0171 and P0172 at the same time? - TCCoA Forums
forums.tccoa.com/7-engine-4-6l-5-4l/173362-p0171-p0172-same-time.html

May 12, 2016 - 4 posts - ‎2 authors

All seemed well until a little after 200 miles the CEL came back on again, only this time it had codes for bank 1 lean and rich (P0171 and ...
Engine code: "System too lean" - TCCoA Forums
forums.tccoa.com/12-eec-tuning/88109-engine-code-system-too-lean.html

Aug 16, 2006 - 20 posts - ‎11 authors

Codes P0171 & P0174 indicate that the system has detected a lean running condition. It flags the code when the system runs lean after a ...
P0171 p0175 rough idle - TCCoA Forums
forums.tccoa.com/7-engine-4-6l-5-4l/133696-p0171-p0175-rough-idle.html

Feb 5, 2011 - 11 posts - ‎5 authors

I got these codes today, P0172 P0175. It basically means that both banks are at their adaptive lean limit (no more fuel can be removed).
p0171 - TCCoA Forums
forums.tccoa.com/7-engine-4-6l-5-4l/127959-p0171.html
Mar 12, 2010 - 27 posts - ‎8 authors

i need a lesson in using search because i know i read up on this issue but i can't find it. Basically if i drive my bird hard i get this code (running.
CEL Killing me!!! HELP - TCCoA Forums
forums.tccoa.com/6-general-tech/115721-cel-killing-me-help.html
Sep 20, 2008 - 30 posts - ‎10 authors

DTC for which Freeze Frame was Stored P0171 .... Ok, So I Am Still Getting The P1131 Code And The Car Is Getting Terrible Terrible Gas ...
P0102, P0171, & P0174 - TCCoA Forums
forums.tccoa.com/7-engine-4-6l-5-4l/161330-p0102-p0171-p0174.html

Apr 26, 2015 - 19 posts - ‎6 authors

SGII reads codes when CEL comes on, always those three (P0102, P0171, ... P0171 & P0174 are system too lean on Bank 1 and Bank 2 ...
PO171 codes - TCCoA Forums
forums.tccoa.com/9-engine-3-8l-4-2l/145076-po171-codes.html
Feb 18, 2014 - 16 posts - ‎3 authors

His scanner also picked up p0171 code and also pinpointed that oil dipstick was loose and I know that tranny fluid dipstick wasnt put in all the ...
1998 Ford Expedition. Code P0171 - TCCoA Forums
forums.tccoa.com/6-general-tech/40781-1998-ford-expedition-code-p0171.html
May 14, 2004 - 2 posts - ‎2 authors

If you read thru all that, you will find the most common thing is a vacuum leak.

Likely all your vacuum hoses are rotted, or your manifold gaskets have gone bad, that's fairly common.

Your o2 sensors are probably bad, as they're 20+ years old, so if you want to list everything you've already done to the car, that will save a lot of time.
 

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10,769 Posts
I was getting that exact code when the air intake temp sensor would fall of a K&N air filter.
You mean leaving a 3/8" hole in the inlet tube for unmetered air? :)

Yup, that'll do it.
 
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