The ECU is in the engine compartment on a 2002 Pontiac Grand Am. It is the sensor behind the converter.
If you mean the pcm, then its inside the air filter box on the bottom
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The o2 sensors on the 2002 Pontiac Grand Am GT are found screwed into the exhaust pipe. There are 2 of these on the 2002 Grand Am GT.
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Under the air filter in the air cleaner box
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