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Downstream oxygen sensor does nothing for fueling its just a monitor, the upstreams do affect fueling a massive amount, may find the wiring is damaged to on of them, if you unplug them it should go to default fueling, if it starts driving with more power can bet one of them is down, resetting the adaptaions needs done through the T4 diagnostic computer. Check your stored codes first, anything related to bank 1 sensor one or bank 2 sensor one you can bet its related
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