I got the tool to see why my engine light is on and is running lean. It returns a P0171 code.

Any idea where to start diagnosing this?

  • What is the code? A lean condition could be caused by a variety of reasons
    – Old_Fossil
    Commented Nov 4, 2020 at 5:54
  • P0171 is the code Commented Nov 4, 2020 at 9:10

1 Answer 1


This is a lean condition code, I'd recommend starting with cleaning the MAF sensor. I'm sure you can find a fairly detailed procedure for that if you google for it. There are also other possible causes for that code, I'd say follow the steps in this article to diagnose and fix: https://www.aa1car.com/library/ford_lean_codes.htm

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