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Ok so i have a '94 civic ex w/ a b18a w/ i/e/h. i had to place my O2 sensor in the cat and i had to extend the wires from the O2 sensor for it to reach. Their is one green wire, one white wire, and 2 black wires. I have everything extended and its all set up and my check engine light isnt on but i was wondering if it makes a difference if the black wires are switched? is it a common ground or something cus their is no order the the wires coming out of the electrical input. if anyone has any info it would be great to know cus i dont want to risk running to rich or to lean or something of that nature. thanks.
 

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yes it does matter, i once wired mine wrong, and couldn't for the life of me figure out what it was, the check engine light would always come one. I switched the black wires, and everything was fine.
 
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