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Bank 1 is the passenger side of the engine , engine cylinders # 1 , 2 , and 3 Bank 2 is the drivers side of the engine , engine cylinders # 4 , 5 , and 6 firewall 3 - 6 2 - 5 1 - 4 front of Ford Explorer ( V6 ) The fuel mixture for the engine is running lean ( there is not enough gas in the air / fuel mixture )
It is not getting enough fuel for complete engine combustion. Check the fuel injection system.
as u lean over engine on right hand side under fuel filter block.
More information is needed. Please restate your question with specifics about the type of manifold, fuel delivery system, and carburetion. Also explain why you think the rear cylinders are lean.
it is your 02 sensor/ bank one usally means the one before your cat. convertor "Lean Bank One" means that the first bank of cylinders, or 3 cylinders on your V6, are not getting enough fuel to mix with the air, hence the term "lean". This is usually solved by cleaning the fuel injectors, and this is most likely your problem, because if the fuel filter or pump were clogged you would have gotten a code of "Lean Bank One" and "Lean Bank Two". It is possible it could have something to do with your oxygen sensor, and the first answer mentioned, because this sensor measures exhaust gas and sends a voltage signal to the computer telling it how rich or lean the engine is running.
1999 Ford Taurus. System Adaptive fuel too lean banks 1 and 2. How can I fix these.
That code is telling you that bank two is running too lean. For some reason the fuel mixture is too lean. Possibly an o2 sensor is malfunctioning.
Give engine more fuel
Perhaps a clogged fuel filter.
Running lean basically means that your Air Fuel Ratio is off and there is more air than fuel, which creates a lean condition. It is called the "Stoichiometric" value. The correct ratio is 14.7 parts air to one part fuel. If you are running for instance a ratio of 16 to 1 then that is lean. Basically too much air when compared to optimal air fuel mix. A ratio of 12 to 1 is too rich. The problem with a lean condition is that the engine will run hot. Normal logic would suggest that with less fuel there would be less heat generated, but it is not the case. A lean condition will actually make the engine run hotter.
It means the amount of air in the fuel/air mixture going into the cylinders it too high.
Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1)