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Computer indicates O2 sensors downstream of cat converter are faulty.

(2008 GMC Sierra 1500)
in Socorro, NM on September 01, 2013
Changed sensors, engine light still on! computer printout mentioned a "FUSE" plus the O2 sensors to be changed. Is there a fuse in this system? Codes:P0161,P0141.P0060, P0056, P0054, P0036
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