Question about 2001 Mercury Sable
P0171 System Too Lean Bank 1
P0172 System Too Rich Bank 1
P0173 Fuel Trim Bank 2
P0174 System Too Lean Bank 2
OK, that's a partial list of codes, the fuel delivery is controlled by the oxygen sensors, so it's possible that something in that area could be causing your problem.
However, it could also be clogged fuel injectors that can't deliver enough fuel to the cylinders compared to the air that is pulled into the engine.
Try some fuel injector cleaner for that poured into the gas tank.
How does it run?
Does it miss at all?
Posted on Oct 08, 2010
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Posted on Jan 02, 2017
SOURCE: Check engine light with codes
P0171 & P0174 indicate Lean burning on banks 1 and 2. The most common cause is a dirty or defective MAF (Mass Air Flow) sensor. Other causes are bad fuel filters or a broken vacuum line.
Posted on Jul 06, 2011
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