1999 Mercury Cougar

1999 MERCURY COUGAR
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BMASON99
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Computer problem
1999 Mercury Cougar 6 cyl Front Wheel Drive Manual

My girlfriend has a 99 Cougar and the car has a cel. P1131. I have done some research on this code and I understand what the code is. I have replaced the pcv, maf, plugs, wires, coil, vaccum lines, egr gasket, fuel filter, and even took the intake manifold off and cleaned it. The car runs great and doesnt appear to have an exhaust leak. I was just wondering what I could replace to get this light to go away.
Nov 30, 2009 at 1:40 PM
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DOCFIXIT
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Code set in continious memory is HO2S-11 is contaminated see diagram


https://images.2carpros.com/forum/automotive_pictures/198357_Graphic_246.jpg

Are you clearing code?
Nov 30, 2009 at 1:57 PM
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BMASON99
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Yes Sorry I am using a scanner to clear code and after about 20 miles if driving it comes back.
Nov 30, 2009 at 2:03 PM
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DOCFIXIT
  • ✓ASE Certified Mechanic
  • 18,828 POSTS
  • ASE Certified Mechanic
Then O2 or wiring is faulty
Nov 30, 2009 at 2:09 PM
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