I did clear it and it came back the next time the next time the car was driven. I'm not sure exactly how long it took as it's my wife's car and she didnt' notice it until she turned it off when she got to work the next morning. I think it's pre-cat but that's just based on the B1S1 designation. I'm thinking that's bank 1, sensor 1 and assuming the sensors are number sequentially from the motor back.
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