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1999 Mercury Mystique

 

Question: code 1131

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1131, 2.0L 4 Cylinder, Omaha, NE, August 11, 2009, 10:15
 Rookie

What does code 1131 most likely mean?

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  • Answer #1

    fernando August 11, 2009, 14:56
     Master

    The OBD-II P-1131 means: Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank No. 1.

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