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If I recall correctly, the O2 sensor plugs into the Cat. If you change the parameters of the cat, or remove it, the O2 sensor becomes confused.
I'd suggest replacing the Cat and resetting the OBD to make your light go off. (most any parts store with a code reader can reset the OBD for you) If the CHECK ENGINE light stays off, you'll be in business!

FriPilot

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