Dead o2 Sensor?

[XDR]

At idle my B1S1 stays steady around ~500mv with little movement compared to the B2S2. Would this mean a dead o2 sensor? Here is a log file, toward the end you can see the flat spot.

Vehicle is a 2001 Chevy 2500HD with the 6.0 stock tune. Ran standard cfg.

TRUCK LOG.hpl

[BRANDON.RYAN]

looks to me like your going to need b2s2 and b1s1. they don't look to be responding correctly. but a for sure test would be to swap sensors if you can and do another log. and see if the readings switch sides before spending 200$

[XDR]

Also, the truck has no driveability issues or codes.

[1266318172]

Pull the O2 sensors, shake them and hear if they make some rattling noise, if yes then throw them in the trash or you can do as Brandon said.