The truck is ideling rough and the exhaust smells rich. P0175 - system to rick bank 2 P0137 - o2 circuit low voltage (bank 1 sensor 2) That is according to the book that came with it. I found... 2011 CHEVY AVEO; P0137 P2270180618_2110 EDT 2011 CHEVY AVEO; P0137 P2270 Hi, ...