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If it is anything like the '96 Grand Am, it is located under a cover between the engine and firewall. The cover has 3 bolts in it. Remove the bolts and the cover and you will find the O2 sensor (front - the other is just after the catalytic converter.) You will need a 7/8" wrench to remove the part.

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Q: Where is the oxygen sensor on a 1997 Pontiac Grand Am 4-cylinder?
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