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2002 Mercury Cougar Question: mercury cougar black smoke problem

 

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chevy 38, 2.5L V6, Shellman, GA, March 28, 2014, 08:39
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My 2002 Mercury Cougar has black smoke coming out the tail pipe when idle at times and when accelerate hard service engine light is on code reads po401 replace 02 sensor down stream @ back of car it don't run rough at all.

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