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2000 F150 2wd 5.4L, new HO2S-11 reads 1.25v HO2S-21 is .2 to .8 old sensor read 1.75v-normal?

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had code p1131, ran rough and stalled once, cleared code, hasn't come back yet, also not running rough any more, plugs & fuel filter ok. I thought 02 reading on this vehicle was between 0 and 1 volt

Vehicle: 2000 Ford F150 dual fuel 5.4l automatic trans

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