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2004 Chevy Silverado 1500 went to emission testing no code being thrown won’t pass took it home I have an engine analyzer it let me check other things besides just the codes it said no communication from O2 sensors anybody got a clue I checked wires underneath the truck no broken wires no burnt wires all hooked up no code and the truck runs perfect
 

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What about the power feed? The O2 needs +12V to heat up properly.
 

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explain whats going on with codes. does the scan tool not communicate with the truck PCM ? check the fuses that supply power the the truck socket .. OBD II ...funny you Said I CHECKED ALL THE WIRES but not fuses !!!!!!!!!!!!
 
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