Checked mass air, leaks around intake amd swapped o2 from side to side. Still the same 1174. What next. All parameters are looking good on scanner everything in tolerance
You may have a fuel injector problem.- try a good fuel system cleaner.
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SOURCE: P0171 Code (Lean Fuel Bank 1) Engine light on
PO 171 indicates a lean condition in bank 1 or the same side of the engine as the first cylinder , usually it is caused by a vacuum leak some where check to make sure that even the smallest of vacuum hoses are in good condition and not leaking
SOURCE: system lean on bank 1 /code 102 mass air flow circuit low input
FIRST CHECK FUEL PREASURE (I THINK ABOUT 3,3 BAR).IF OK, CHANGE AIR FLOW SENSOR.
MARKO
SOURCE: 98 chevy suburban, code reads mass air flow sensor
Check the wire leads and clean them before reconnecting the wire leads. It wouldn't hurt also to clean the MAF sensor with MAF cleaner, the code your getting is most common to the high performance oil base filters like K&N.
Good luck and this should help you resolve your MAF issues. Thank you for using Fixya
SOURCE: 2001 Chevy Impala 3.8L. P0171 lean fuel code. We
DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
According woth your previous tasks, inspect all vacuum and PCV hoses, replace if necessary.
SOURCE: I'm getting trouble code p1174
i have an 2007 chevy uplander flexfuel i keep getting p1174 also i have replaced the the o2 sensors and the light keeps coming on
i belive it has something to do with the fuel injection system
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Cleaned fuel injectors, checked mass air and o2 sensors. Fuel injectors are balanced
There are a number of things that can cause this DTC (clogged Fuel Injectors, faulty oxygen sensor, ignition problem, fuel injection problem,
engine mechanical condition, a vacuum leak, etc.). There is even a service bulletin out about this https://www.autocodes.com/pdfview.php?pd... Calculated values for this Fuel Trim Cylinder Balance diagnostic are often a problem because of the large number of sensor variables used in the calculation. My only suggestion is to throw the problem to a dealer and see if they can sort this out.
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