what does these 2 code definitions mean? on 2011 Buick Regal

Catalyst System Bank 1 Low Efficiency and HO2S-11 (Bank 1 Sensor 1) Circuit Low Input Thanks in advance for any help given.

by in Kimberly, AL on February 12, 2014
3 answers
ANSWER by on February 12, 2014
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 by on February 13, 2014
check with the dealer could be still under warranty
ANSWER by on February 13, 2014
warranty on emissions is 7yr 70k miles

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