Driving home last night and has both of these come on at the same time on my 2012 Advance SH-AWD. I've never heard of both coming on at the same time. What could cause that? Would both cats or 02 sensors go bad at the exact same moment? Car was fine until then.

 

perhaps the cats have went bad?
have you diagnosed it further? get a scan-tool that can read DTCs and monitor the fuel trim

 

I wouldn't think both cats or both 02 sensors would go bad at the same time. I disconnected the battery and it's gone. Hopefully it doesn't come back. I just thought it was weird both would show up at once.