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grandprixgirl

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    I have an 02 grand prix 3.8 L (not supercharged). My check engine light is on and I have marked fuel efficiency loss. I believe that I need to change the oxygen sensor. My question is, do I need to change the front and the back sensor or just one. And if it is just one, which one should I change? If I take it to autozone to have the codes read again, does anyone know the codes to indicate a bad sensor? Lots of questions, but any suggestions would be helpful and greatly appreciated! AC Delco seems to be the only way to go as far as parts are concerned, but I just want to make sure I get the right ones!
    Fun in the Sun......GrandPrixGirl
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