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My 2001 Ford Explorer 4Cyl with code p0171 Too Lean Bank1, how do I fix the code?

Vehicle: 2001 Ford Explorer 4Cyl

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HI there,

This code usually indacates a problem with an intake manifold leak, rear O2 senosr or a problem with the fuel pump pressure. I would start with the engine running, spraying some carb cleaner around the intake and see if the engine starts running smoother or the idle speed increases. It may also be a problem with the mass air flow sensor.
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P0171 FORD - Fuel Injection System Too Lean Bank 1

Read more: https://www.autocodes.com/p0171_ford.html

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