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The only sensor should be the MAF sensor. It's black, about 2 inches by 2 inches, with two screws. Is this the sensor you are talking about. If so you have to have it plugged in. Just unscrew it from the old one, and screw it into the new one. If you don't have the sensor pluged in, your car will not run. Look at the picture at the top of this thread as a reference.
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