Had all the lifters replaced. Some backfiring when lifter failed. I received vehicle back from dealer and just put my old OBDII scanner on it. Came up with a P2255 code which is supposed to be a bad O2 sensor. Dealer says that this code is not valid for a 21 Suburban.

Can anyone comment on this code and whether the backfiring might have damaged the O2 sensor?

Dealer does say there is a TSB covering weird codes due to chafing of a wiring harness near the engine?

 

Since it's new I would let the dealer address the TSB issue. They have access to engineering's advise.