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Here's how my train of diagnoise would go,
after bleeding the system I would reset the ECU by pulling the negative for ten minutes.
if the code popped up again I would change the sensor since there cheap and reset the ECU again.
after that, try tracing some wires, one of my buddys had a car that wouldnt pass aircare and it turned out the o2 sensor wires were backwards.
and if all else fails pull the bulb and call it a day
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