2002 f150 p0171 & p0174 P0131: o2 sensor circuit low voltage (bank 1, sensor 1) Ford f-150 questions
2002 F150 P0171 & P0174 - YouTube
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F150 p0174 p0171 2002⫷ ford 4.6l & 5.4l, p0021 & p0022 fix. expedition, f150, f250, f350 P0171 lean f150 2002 too fix.