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Old 06-27-2013, 10:44 PM   #6
art02gt
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Join Date: Sep 2006
Vehicle: 2002 Mustang GT
Location: El Paso, TX
Posts: 655
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rear o2 sensors only monitor cat efficiency and have nothing to do with the engine running rich or lean. you have a rich condition which means you either have too much fuel or not enough air. I wouldn't throw parts at it yet, the first thing I would do is check for vacuum leaks (pcv hoses, intake gaskets etc.).
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2002 GT: 4.10s, AM CAI, UPR o/r X-Pipe, MGW STS, Flowmaster 40's, more to come
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