This diagnostic code informs that an Oxygen Sensor located in bank 2 has detected a very high condition or there is an oxygen insufficiency in the exhaust gases. In the 6, 8 and 10 cylinder engines, bank 2 corresponds to the side of the engine that has cylinder number 1. It should be mentioned that, this DTC code is very similar to P0172, and it is very likely that your vehicle shows both codes to the Same time. In general terms, the gasoline mixture sent by the PCM computer is very high.