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mercury cougar black smoke problem on 2002 Mercury Cougar

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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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Scan test needed! Live data will help a bunch!
what do you mea by scan test and push rod and camshaft, that mean I need a new engine
what do you mean by scan test and push rod and camshaft, that mean I need a new engine
what do you mean by scan test and push rod and camshaft, that mean I need a new engine