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    code po135,po141,po155 PLEASE HELP

    I have a 1997 explorer 4.0.... pulled codes po135,po141,po155 on all o2 sensors. I'm getting no voltage at the o2 sensors with the key on and tried it when it was running to. The fuse for the pcm is good. I checked the voltage at the pcm on pins 93,94,95,96 and got nothing. I just want to make...
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