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Electrical problems are the most difficult to diagnose....

Could be anything from a blown ecu to a melted wiring harness causing a short.

Did you check all the fuses under the dash also?

You don't need the O2 sensor to start the car. Until the car gets up to temp it's running open loop (spraying the ammount of fuel directly specified from the ecu fuel maps with no feedback from the O2 sensor). But once it reaches operating temp and goes into closed loop it will freak out, throw codes and run rich.
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