2011 Buick Regal Q&A

2011 Buick Regal Question: what does these 2 code definitions mean?

Catalyst System Bank 1 Low Efficiency and HO2S-11 (Bank 1 Sensor 1) Circuit Low Input Thanks in advance for any help given. -
Answer 1
You gotta check out the o2 sensor output + wiring etc on bank 1 Google it of utube tell you how to go about it.. -
Answer 2
check with the dealer could be still under warranty -
Answer 3
warranty on emissions is 7yr 70k miles -