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Old 06-25-2007, 02:27 PM
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NissanTech NissanTech is offline
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2004 Xterra
 
Join Date: Jun 2005
Location: California
Age: 52
Posts: 12,536
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P0174=Fuel System Lean, but it is not necessary for the O2 sensor. You shouldn't replace the O2 sensor. The code it is trigger when the ratio of air/fuel it is too lean, more air than the necessary or the air flow meter reading of the air flow is no correct.
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