Not necessarily. If you are not sure that all codes popped up at once, I would clear the codes and see what comes back. If they did, my input would be that codes are the result of something else that is the core issue not the sensors. The pre cat sensor is part of the air/fuel mixture determination. The post cat sensor focus on emissions. I suggest troubleshooting the cause rather than replacing the sensor at this point. Do you know if the codes were generated during a cold start? Have you lost any engine performance, idling RPMs normal, engine missing? Even if all is fine, I would start troubleshooting by checking for vacuum leak.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas