Question about 1999 Mercury Cougar

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How fix the code p1131 and p1518

99 mercoury cougar v6 2.5L std

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

chuck943
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SOURCE: code p1131 on a 1999 mercury cougar

Lack of HO2S-11 Switch, Indicates Lean.Right bank front 02 sensor. When an HO2S sensor indicates lean at the end of a test, the system is trying to correct for an over-lean condition. The code is set when the fuel control system no longer detects switching for a calibrated amount of time.In other words the 02 sensor is indicating lean and the fuel trim has reached the programed limit trying to correct it.
There are many things that could cause this like a bad 02 sensor,a vacuum leak,a leaking or contaminated fuel injector/s,a stuck open PCV valve,leak in hose between MAF sensor and engine causing un-metered or unmeasured air entering the engine,exhaust leak,improperly seated oil dipstick,stuck EGR valve.
Check PCV valve first if it is stuck open if you pull the hose off of the valve cover that hooks to the air tube between MAF and engine you will feel a strong vacuum pull there,normal you would hardly feel it.

Posted on Mar 11, 2009

  • 13 Answers

SOURCE: removing alternator bolts on mercury cougar

There are 3 bolts. You'll need a LOT of socket extensions and a car hoist!
and a lot of time and patients.

But an even better idea is to just check the wire connections make sure they are well connected and no gaps on the female connectors if you suspect a bad alt.

Posted on Jan 11, 2010

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Sep 24, 2010 | 1999 Mercury Cougar

2 Answers

My 99 cougar is running lean and has 5 error codes po171 p1131 p1151 p0420 p0174 i read the chart but dont no what they are or what the problem is ?? help


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Feb 03, 2010 | 1999 Mercury Cougar

1 Answer

Removing alternator bolts on mercury cougar


There are 3 bolts. You'll need a LOT of socket extensions and a car hoist!
and a lot of time and patients.

But an even better idea is to just check the wire connections make sure they are well connected and no gaps on the female connectors if you suspect a bad alt.

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http://www.bba-reman.com/content.aspx?content=Ford%20P%20Powertrain%20Diagnostic%20Fault%20Codes


from experience the system is to lean not getting enough gas which causes lost of power pinging rough idoling and it clogs your fuel injectors which will cause failed smog test good luck

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