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The Mass Air Flow sensor is located to the right of the engine, it is on the cold air intake side. You have to take the plastic guard off, then you will need the correct torx driver bit with the hole cut out in it. There are only four screws, it is pretty easy. Just be careful with the new one when putting it in.

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Q: Where on a 1999 Pontiac grand prix GT 3.8 L is the Mass Airflow Sensor and how do you go about replacing it on your own?
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