Nissan Sentra GXE 2002 Problema de verificação

Bom, tenho problemas com o Nissan Sentra GXE 2002 Motor 1.8, coloquei o scanner e tenho um sensor de oxigênio ruim, mas isso usa 4 O Port 2 Bank 2 Bank 1, mas como posso identificar esse sensor, obrigado

Hello: look that car has 4 sensors, 2 are oxygen and 2 are from the catalyst, those above are oxygen, in the scanner they appear as O2S1 Bank 1 or Bank 2, that is, sensor one of the bank one or sensor 1 of Bank 2, the banks are distingu Sensor one from Bank one, is the front sensor, if you mark sensor 2 of the bank one is the sensor below the front, and so on.