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Q: ECU repalcement on 2001 Saturn SC2

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I replaced the ECU and now the car will not start. All the numbers match the old ECU. I put the old one back in and it will start. What may cause thisissue with the new ECU?
It is possible that it needs programmed upon installation. You may want to consult a Saturn specialist.

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