Check for loos connections between the intake and the tube from the air filter. Check if the clamp is loose or leaks in the tube which can cause an incorrect reading. Other than that it may be a dirty MAF sensor which can be fixed by spraying carb cleaning or tuner spray in the intake or it may be bad or a bad oxygen sensor;.
SOURCE: check engine light on
Check out this site as it tells you exactly the problem http://www.obd-codes.com/p0171
Hope this helps
SOURCE: po452 trouble code changed sensor engine light
you might try unhooking the battiey for 20min both + and - posties cuz that will force the computor to have to resest only if you have addressied the fuel pressure problem which taht would most likly be your filter which isn't all that much
SOURCE: PO171 error code System too lean bank 1
Here are some possible causes, I would start with anything related to replacing the intake.
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose
SOURCE: Where is the knock sensor 2 (bank 2) located on a
I don't have a diagram but they are under your intake manifold. It's not to bad of a job. You don't have to remove the fuel rails or the injectors, they can come up with the intake. The #2 knock sensor is the one in the rear. I will suggest getting both of them and also the harness and do it all while you have it apart. I believe you will find that water has gotten down in the hole where the knock sensors are located. Make sure to clean it out very good with compressed air before you install your new knock sensors.
SOURCE: my 2000 chevy venture idles rough, but if you give
A scanner reading- P0171 system too lean bank 1 code is the MAF sensor.
The MAF sensor should be replaced. It is a fairly easy fix and relatively inexpensive. If you are running too lean on one bank, it is more than likely the MAF.
Let me know if this helps and if not I will try to help you farther.
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