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How do I fix the engine code P0171 on a 2003 Ford F250 5.4L?

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How do I fix the engine code P0171 on a 2003 Ford F250 5.4L? What are the symptoms?

Vehicle: 2003 Ford F250 5.4L

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Common symptoms are engine light on and rough idle. Start by checking for intake leaks, if no leaks are present you may have to replaced the left front O2 sensor to fix the problem.

P0171 FORD - System Too Lean Bank 1

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

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