CHECK ENGINE LIGHT - CODE: P1131

  • Tiny
  • ashleyd01
  • 1999 Mercury Cougar
  • 6 CYL
  • FWD
  • automatic
  • 95,700 miles

My 1999 Mercury Cougar has the CE light on and the code read p1131. I can't afford to take it in to a shop right now, so what do I do to fix this?

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Saturday, December 4th, 2010 AT 8:50 PM

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  • Tiny
  • rasmataz
  • Member

DTC P1131 indicates the system is correcting RICH for an overly LEAN condition. The Heated Oxygen Sensor (HO2S) voltage is less than 0.45 volts. This is usually due to a vacuum leak after the MAF. It can also be caused by a bad PCV valve or PCV system hose.

It can also be caused by low fuel pressure or a plugged injector.

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Saturday, December 4th, 2010 AT 8:53 PM
  • Tiny
  • ashleyd01
  • Member

How do I fix this?

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Saturday, December 4th, 2010 AT 10:20 PM

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