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O2 Sensor Problems

Discussion in 'Modified 1995-2001 Explorers' started by dorathexplorer98, May 7, 2015.

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  1. dorathexplorer98

    dorathexplorer98 New Member

    March 12, 2015
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    Year, Model & Trim Level:
    1998 Explorer
    I have a 1998 ford explorer with the 4.0 v6. im getting a P1151 Lack of HO2S-21 Switch, Sensor Indicates Lean. i checked the live feed and even after the o2s are warmed up there is no voltage and -100% STFT for all three sensors.
    Checked the harness to make sure it wasnt damaged. i conducted a signal and heater test my haynes manual says to try and im not getting a reading for either. does this mean its a bad ground. any help would be awesome.
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