360 Magnum with stock EFI engine codes

Truckie said

If I remember correctly the donor truck only had one pre cat O2 and it was just past where the two exhaust pipes came together. Maybe I’m wrong

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Could be, Ive seen stranger things. And I know with emissions stuff the manufacturers make different configurations for different states. Mine for sure had 2 pre and 2 post cat o2s. Mine is a 2001 ob2 California truck.