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  1. G

    3v swap troubleshoot

    I’d check the signal wire colors on both upstream O2 sensors. It is possible to mismatch the upstream and downstream connectors. Passenger side upstream O2 sensor, 1 of the 4 wires should be grey with a light blue stripe (GY-LB). Driver side, 1 of the 4 wires should be red with a black stripe...

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