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Re: MAF Sensor
With both banks reading lean it sounds like a vacumm leak from an area common to both banks. Have you checked PCV valve, vacuum lines, Intake manifold, plentum gasket ? I had a 96 F250 with this problem turned out to be the MAF sensor, but you have already replaced yours. Also had an 01 Explorer Sport with same codes turned out to be the rubber elbow on the PCV tube, squeezed elbow taking tube off and noticed cracks along the mold seam. Does yours have the poppet valve type fuel injection ? There has been a problem with the injectors on this system.
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