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Posted on Aug 18, 2010
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What does the trouble code PO171B mean on a Ford Escort ZX2

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Brad Kirby

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  • Master 547 Answers
  • Posted on Nov 12, 2010
Brad Kirby
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Joined: Mar 04, 2010
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P0171 is O2 sensor indicates lean. You probably have a vacuum leak. The most likely and common cause is the PCV elbow at the front of the engine.

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