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Check engine light - code: P1131

Tiny
ASHLEYD01
  • MEMBER
  • 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?
Saturday, December 4th, 2010 AT 8:50 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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
  • 2 POSTS
How do I fix this?
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Saturday, December 4th, 2010 AT 10:20 PM

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