Where is the O2 sensor located?

Hello, are you getting any specific trouble codes stored for an oxygen sensor, and if so, what are the code numbers?

The front pre-catalytic converter oxygen sensors (B1S1 and B2S1) are both wide band Air/Fuel ratio sensors, whereas the post-catalytic converter (after the converter in the exhaust) are narrow band (regular type Oxygen sensors). There is a huge difference in operations and wiring from the front to rear sensors, this is the reason for asking about any codes set. For certain codes, such as Oxygen sensor heater codes, can easily be a wiring issue, as these are 12v feeds to the sensors and are controlled by the engine computer on the ground side.