Bank 1 sensor 1 is the first oxygen sensor usually in the exhaust manifold. Usually it needs to be replaced. Sometimes it can just be a bad connection in the plug for the oxygen sensor.
P0157 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
Bank 1 would be the bank of cylinders that contains the number 1 cylinder.Sensor 1 would be the sensor placed before the catalytic converter (AKA the upstream sensor).
Trouble code P0137 means:O2 sensor circuit low voltage (Bank 1 Sensor 2)
Replace it. Sensor 2 is the one AFTER the catalytic converter.
Bank 2 Sensor 2 is passanger side after cat.
O2 sensor circuit high voltage (bank 1 sensor 2)
Usually bank 2 sensor 1 & 2 are right after the converter in the exhaust pipe.
On a 2005 Nissan Maxima where is the Camshaft Position Sensor (Bank 1) located?
Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)
Sensor 2 is after the catalytic converter.
Bank # 1 is the passenger side of the engine Bank # 1 , SENSOR # 1 , is close to the engine in the exhaust Bank # 1 , SENSOR # 2 , is in the exhaust after the catalytic converter ( downstream )
That is passenger side after the catalyst.